Co-reporter:Dan He;Ying Wu;Tuo Zhao
RSC Advances (2011-Present) 2017 vol. 7(Issue 63) pp:39604-39610
Publication Date(Web):2017/08/11
DOI:10.1039/C7RA04627H
A novel chemical approach to prepare the high performance polymer poly(phenylene sulfide sulfone) under mild conditions was presented based on 4,4-difluorodiphenylsulfone and sodium sulfide (Na2S) in i-pmim PF6 (IL)/MImBS (ZI) at atmospheric pressure and compared with conventional methods. The highest molecular weight (2.5 × 104) and yield (>99%) polymers were synthesized in IL/ZI in the presence of sodium carbonate and sodium hydroxide at 200 °C for 4 h. ZI can significantly improve solubility of the basic inorganic salt Na2S. And using ILs as solvents made removing toluene by purging with nitrogen much easier and the time was shortened significantly from 5–8 min to 1–2 min. In addition, the ILs can be recycled easily and still possess excellent performance.
Co-reporter:Xiaozhou Xu, Wang Xing, Yusheng Chen, Fengquan Liu, Xiaoxi Wu, Tao Dong, Pan Ye, Zhengping Liu, Hui Huang
Synthetic Metals 2017 Volume 231(Volume 231) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.synthmet.2017.06.014
•Two new acceptors SF-2IIG and SF-4IIG were designed and synthesized.•The effects of the number of the electron deficient building blocks on several characters were investigated.•Increasing the numbers of IIG building blocks is beneficial to photovoltaic performance to achieve 220% enhancement.•This result demonstrated a strategy of achieving high efficient non-fullerene solar cells.Two new small-molecular acceptors SF-2IIG and SF-4IIG were designed and synthesized to investigate the influence of the numbers of electron-deficient subunits of non-fullerene acceptors on the efficencies of photovotaic devices. The studies showed that these two acceptors have different optical absorbption, energy levels, charge transport mobilities. As a result, the efficiencies of SF-4IIG based solar cells are significantly higher than those of SF-2IIG based ones.
Co-reporter:Zhiju Zhao, Taixin Chen, Shuting Jiang, Zhengping Liu, Decai Fang and Yong Qiang Dong
Journal of Materials Chemistry A 2016 vol. 4(Issue 21) pp:4800-4804
Publication Date(Web):20 Apr 2016
DOI:10.1039/C6TC00972G
Through the combination of a large conjugation core and peripheral phenyl rings, one mechanochromic (MC) luminogen (3) with multicolored and high contrast emission is facilely obtained. Luminogen 3 shows aggregation-induced emission (AIE) and crystallization enhanced emission (CEE). The emission of 3 can be switched between deep blue (432 nm, ΦF = 42.2%), green (492 nm, ΦF = 59.3%), and orange (584 nm, ΦF = 0.4%) with high contrast in both color and efficiency through morphology tuning by heating, mechanical stimuli, and solvent fuming. The multicolored and high contrast MC emission of 3 affords its potential application in optical recording. A single luminogen of 3 can form a green or deep blue emissive background on a piece of weighing paper, and weak orange emissive letters could be obtained through writing on both backgrounds. Letters on the green background transfer to deep blue upon fuming with methanol, and those on the deep blue background transfer to green upon fuming with acetone. All the letters could be erased through grinding or heating at 160 °C.
Co-reporter:Jing Wang;Ying Wu 武英;Zheng-ping Liu 刘正平
Chinese Journal of Polymer Science 2016 Volume 34( Issue 8) pp:981-990
Publication Date(Web):2016 August
DOI:10.1007/s10118-016-1818-0
A benign approach for efficient preparation of poly(ether sulfone) (PES) (ηinh = 0.10−0.31 dL⋅g−1) has been presented by using ionic liquid (IL)/zwitterion (ZI) as reaction medium. It has been found that the interaction between 4,4′-dihydroxydiphenylsulfone (Bisphenol-S) and ZI at elevated temperatures results in efficient reduction of dehydration time, which is confirmed by TGA curves, melting point of the mixture and FTIR spectra. Furthermore, no agglomeration is observed at dehydration stage, which is attributed to the high solubility of Bisphenol-S dipotassium salt in IL/ZI. This also makes the polymerization temperature (150 °C) much lower than a conventional method (220−300 °C). In order to demonstrate the efficiency of IL/ZI as reaction medium, the polymerization was also performed in sulfolane under the same reaction condition as that in IL/ZI.
Co-reporter:Leli Wang, Jianan Shen, Yongjun Men, Ying Wu, Qiaohong Peng, Xiaolin Wang, Rui Yang, Khalid Mahmood and Zhengping Liu
Polymer Chemistry 2015 vol. 6(Issue 18) pp:3480-3488
Publication Date(Web):27 Mar 2015
DOI:10.1039/C5PY00184F
Ionic liquid was employed as a reaction medium to prepare starch-based macro-initiator for atom transfer radical polymerization (ATRP), due to its high dissolubility for starch and chemical inertness. Starch macro-initiators with varying degrees of substitution (DS) were successfully synthesized in ionic liquid 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) by homogeneous esterification with 2-bromoisobutyryl bromide at room temperature without the use of any additional catalysts. Starch-based copolymers (Starch-g-PS and Starch-g-PMMA) were prepared at the molecular level via homogeneous ATRP using CuBr/PMDETA and CuBr/BPY as catalysts. Compared with heterogeneous surface-initiated polymerization, the graft density and graft ratio were significantly improved. The structure and thermo behaviour of the graft copolymers were characterized by 1H NMR, FTIR and TGA. The molecular weights of the grafted polymer chains were analyzed by gel permeation chromatography (GPC) after hydrolyzing of the starch backbone from the copolymer. The effects of molar ratio of monomer to initiator, solvent, ligand and temperature on the graft polymerization were investigated as well.
Co-reporter:Yongjun Men, Xiyan Du, Jianan Shen, Leli Wang, Zhengping Liu
Carbohydrate Polymers 2015 Volume 121() pp:348-354
Publication Date(Web):5 May 2015
DOI:10.1016/j.carbpol.2014.12.068
•The dissolution of corn starch in the ionic liquid [EMIM]Ac was studied.•Starch-grafted polystyrene copolymer was prepared in [EMIM]Ac via free radical polymerization.•Grafting percentages of up to 113.9% were achieved.•The graft-copolymer presented good thermostability.The copolymer of starch grafted with polystyrene (starch-g-PS) was synthesized with high grafting percentage by utilizing the ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) as solvent and potassium persulfate as initiator. The effect of various parameters upon the polymerization were studied including: initiator concentration, styrene:starch weight ratio, the reaction time and temperature. Grafting percentages were calculated using an FT-IR calibration method, with values up to 114%. The resulting copolymer was characterized using FT-IR, SEM, WAXD and TGA, which demonstrated that polystyrene side chains were evenly distributed on the starch backbone. Our results indicate that ionic liquid dissolution of starch, prior to polystyrene grafting, is a versatile methodology for the synthesis of amphiphilic, polysaccharide-based graft copolymers, having high grafting percent.
Co-reporter:Leli Wang, Ying Wu, Yongjun Men, Jianan Shen and Zhengping Liu
RSC Advances 2015 vol. 5(Issue 87) pp:70758-70765
Publication Date(Web):13 Aug 2015
DOI:10.1039/C5RA14765D
Single electron transfer living radical polymerization (SET-LRP) was employed to prepare thermal-sensitive starch graft poly(N-isopropylacrylamide) (Starch-g-PNIPAM) with soluble Starch-Br as macro-initiator at molecular level. And Starch-g-PNIAPM with improved graft ratio and controlled length of graft chains were obtained. The effects of molar ratio of monomer to initiator and temperature on polymerization were investigated. The thermal responsibilities investigated by 1H NMR and UV showed that the LCST ranged from 31.5 °C to 23 °C with the increase of the length of PNIPAM chains and the concentrations of copolymers. Starch-g-PNIPAM hydrogels were gained when adding N,N′-methylenebisacrylamide as crosslinking agent and the swelling and deswelling behaviors were also investigated. The obtained hydrogels possess a high equilibrium swelling ratio as high as 1826%, and an extremely rapid shrinking rate as fast as losing more than 85% of water in 5 min.
Co-reporter:Jianan Shen, Leli Wang, Yongjun Men, Ying Wu, Qiaohong Peng, Xiaoling Wang, Rui Yang, Khalid Mahmood and Zhengping Liu
RSC Advances 2015 vol. 5(Issue 74) pp:60330-60338
Publication Date(Web):06 Jul 2015
DOI:10.1039/C5RA11170F
The effect of water and methanol on the dissolution and gelatinization of corn starch in [MMIM][(MeO)HPO2] was investigated by optical microscopy and differential scanning calorimetry. The presence of an appropriate amount of water can accelerate the dissolution while methanol has the opposite effect. A [MMIM][(MeO)HPO2]/water mass ratio of 7/3 is the best ratio for corn starch to disperse a [MMIM][(MeO)HPO2]–water mixture in, since it can dissolve starch at lower temperature. When methanol was added to the mixture of [MMIM][(MeO)HPO2]/water at a ratio of 8/2 (w/w), the methanol accelerated the dissolution process of the corn starch, since it can penetrate the starch granules and swell the outer layer of granules with water. It is demonstrated that [MMIM][(MeO)HPO2]/water/methanol at a ratio of 8/2/3 (w/w/w) is a good mixed solvent like [MMIM][(MeO)HPO2]/water 7/3 (w/w) for corn starch.
Co-reporter:Qiaohong Peng, Khalid Mahmood, Ying Wu, Leli Wang, Yanyan Liang, Jianan Shen and Zhengping Liu
Green Chemistry 2014 vol. 16(Issue 4) pp:2234-2241
Publication Date(Web):14 Jan 2014
DOI:10.1039/C3GC42477D
Biodegradable copolymers of L-lactic acid and ε-caprolactone [P(LLA-CL)s] were prepared in sulfonic acid-functionalized Brønsted acidic ionic liquids (SFBAILs) with very different anions and cations. SFBAILs work as both solvents and catalysts. The copolymerization process was proved to be a combination of polycondensation and simultaneous transesterification after a fast ring-opening polymerization of ε-caprolactone through a kinetic study. Copolymers with different monomer ratios were obtained. We found that the anions rather than the cations of SFBAILs have a great impact on the polymerizations. In addition, SFBAILs can be simply recovered by phase separation and recycled without decreasing the efficiency.
Co-reporter:Khalid Mahmood, Heng Lu, Zheng-Ping Liu, Cuihong Li, Zhen Lu, Xiao Liu, Tao Fang, Qiaohong Peng, Guangwu Li, Lin Li and Zhishan Bo
Polymer Chemistry 2014 vol. 5(Issue 17) pp:5037-5045
Publication Date(Web):16 Apr 2014
DOI:10.1039/C4PY00004H
Three novel isoindigo based donor–acceptor (D–A) conjugated polymers P1–3 have been synthesized by Suzuki polycondensation and utilized as donor materials for polymer solar cells (PSCs). These three polymers are of the same backbone, but have different substituents. All these polymers exhibit high thermal stability and broad absorption in the range of 300 to 770 nm. Hole mobilities of polymer films spin coated from 1,2-dichlorobenzene (DCB) solutions are 7.00 × 10−4, 2.37 × 10−3 and 2.90 × 10−4 cm2 V−1 s−1 for P1, P2 and P3, respectively. PSCs based on P2:PC71BM (1:2 by weight) with a 2% DIO additive displayed a power conversion efficiency (PCE) of 3.41% with a short-circuit current density (Jsc) of 7.57 mA cm−2, an open-circuit voltage (Voc) of 0.85 V, and a fill factor (FF) of 53%, under the illumination of AM 1.5G (100 mW cm−2). XRD diffraction measurements have shown that these polymers have a short π–π stacking distance in the solid state. The results demonstrate that these conjugated polymers could be promising donor materials in the application of polymer solar cells.
Co-reporter:Khalid Mahmood, Zheng-Ping Liu, Cuihong Li, Zhen Lu, Tao Fang, Xiao Liu, Jianjun Zhou, Ting Lei, Jian Pei and Zhishan Bo
Polymer Chemistry 2013 vol. 4(Issue 12) pp:3563-3574
Publication Date(Web):04 Apr 2013
DOI:10.1039/C3PY00341H
Three new isoindigo containing donor–acceptor (D–A) type conjugated polymers were synthesized by palladium catalyzed Suzuki polycondensation and used as donor materials for polymer solar cells (PSCs) and field effect transistors (FETs). All the polymers possess good solubility in common organic solvents, high thermal stability, and broad absorption in the range of 300 to 750 nm. These polymers have narrow band gaps (1.66 to 1.70 eV) and low lying HOMO energy levels (5.15 to 5.31 eV). Hole mobilities of these polymers are in the range of 1.78 × 10−3 to 2.62 × 10−3 cm2 V−1 s−1. PSCs based on P3:PC71BM (1:2, by weight) gave the best device performance with a power conversion efficiency (PCE) of 1.75%, a short-circuit current density (Jsc) of 4.74 mA cm−2, an open-circuit voltage (Voc) of 0.81 V, and a fill factor (FF) of 0.45, indicating these polymers can be promising donor polymers for polymer solar cells.
Co-reporter:Junyan Dou
Polymer International 2013 Volume 62( Issue 12) pp:1698-1710
Publication Date(Web):
DOI:10.1002/pi.4470
Abstract
Composites of poly(ethylene terephthalate) (PET) with ionic liquid (IL) as matrix were prepared by in situ polycondensation. XRD and DSC were performed to probe crystal structures and determine the crystallization kinetics during crystallization. ILs could serve as nucleating agents in accelerating the crystallization of PET. However, the ability of ILs to induce crystallization is different with variation of IL content. Avrami analysis revealed that the Avrami exponent, n > 2, testifies to the existence of three-dimensional spherulitic growth. The kinetic equations (the modified Avrami equation and the combined Avrami and Ozawa equation) are employed to analyze the non-isothermal process. The modified Avrami equation could adequately describe the primary non-isothermal crystallization of PET/IL. The approach of combining the Avrami and Ozawa equations provides a fairly satisfactory description of the non-isothermal crystallization of PET/IL. © 2013 Society of Chemical Industry
Co-reporter:Jing Wang
Science Bulletin 2013 Volume 58( Issue 11) pp:1262-1266
Publication Date(Web):2013 April
DOI:10.1007/s11434-013-5741-2
Poly(aryl ether ketone)s (PAEKs) were successfully synthesized via nucleophilic aromatic substitution (SNAR) mechanism, using ionic liquids as green reaction media. The influence of various reaction parameters including monomer concentration, dehydration time, polymerization temperature and duration, IL’s cations and anions nature, upon PAEKs molecular weight was investigated. In addition, the peculiarities of hydrogen-bonding ability of ILs were investigated. The interaction of 2,2-bis(4-hydroxyphenyl) propane (bisphenol A) with ILs has a strong influence on PAEKs synthesis. Various moderate molecular weight PAEKs have been obtained in high yields with molecular weights ranging from 10000 to 18000 g mol−1.
Co-reporter:Junyan Dou and Zhengping Liu
Green Chemistry 2012 vol. 14(Issue 8) pp:2305-2313
Publication Date(Web):25 Jun 2012
DOI:10.1039/C2GC35310E
A series of phenylalkyl pyrrolidinium ionic liquids (ILs) ([YBPy][X], Y = NO2, CH3, F, H; B = benzyl, phenethyl; X = Tf2N) were synthesized and found to be environmentally benign reaction media for the preparation of poly(ethylene terephthalate) (PET). ILs with specific functional groups had high thermostabilities and showed interesting properties in synthesizing PET at lower temperature (190–240 °C) and pressure (500 Pa) compared to conventional ILs. PET with Mw up to 1.9 × 104 g mol−1 was obtained. The ILs can be easily separated and reused after simple purification except for the PF6− ILs. This process provides a valuable and environmentally friendly alternative to the currently available method for the preparation of PET in industry.
Co-reporter:Jing Wang and Zhengping Liu
Green Chemistry 2012 vol. 14(Issue 11) pp:3204-3210
Publication Date(Web):12 Sep 2012
DOI:10.1039/C2GC35704F
Herein we report the novel use of ionic liquid (IL)/zwitterion (ZI) as a reaction medium for the efficient synthesis of polysulfones (PSFs) with high molecular weight and high yield. The results showed that ZI can significantly improve the solubility of 2,2-bis(4-hydroxyphenyl) propane (bisphenol A), and an intermediate sulphonic-type IL with high acidity was formed by ZI and bisphenol A, resulting in 80% reduction in dehydration time compared with conventional methods.
Co-reporter:Junyan Dou;Khalid Mahmood ;Yuntao Zhao
Polymer International 2012 Volume 61( Issue 9) pp:1470-1476
Publication Date(Web):
DOI:10.1002/pi.4237
Abstract
In order to improve the method of synthesis of poly(ethylene terephthalate) (PET), a series of ionic liquids (ILs) based on benzyl imidazolium ([YBMIM][X], Y = NO2, CH3, F; B = benzyl; X = Tf2N) were used to investigate the formation of PET at low temperature and pressure. High molecular weight PET (Mw up to 2.6 × 104 g mol−1) was obtained by two-step polycondensation in these ILs at lower temperature (230–240 °C) than with traditional melt polycondensation (270–290 °C). Moreover, the molecular weight of the resulting PET was found to depend on the activities of the catalysts used in the ILs. The catalysts (Sb2(OCH2CH2O)3, Sb(OAc)3, Sb2O3) used in the preparation of PET have little effect on the thermostability of the ILs. The ILs can decrease the viscosity of the reaction system, and thus small molecules can be easily removed. Copyright © 2012 Society of Chemical Industry
Co-reporter:Guoxing Sun, Guangming Chen, Zhengping Liu, Ming Chen
Carbon 2010 Volume 48(Issue 5) pp:1434-1440
Publication Date(Web):April 2010
DOI:10.1016/j.carbon.2009.12.037
A homogeneous dispersion of multi-walled carbon nanotubes (MWCNTs) in syndiotactic polystyrene (sPS) is obtained by a simple solution dispersion procedure. MWCNTs were dispersed in N-methyl-2-pyrrolidinone (NMP), and sPS/MWCNT composites are prepared by mixing sPS/NMP solution with MWCNT/NMP dispersion. The composite structure is characterized by scanning electron microscopy and transmission electron microscopy. The effect of MWCNTs on sPS crystallization and the composite properties are studied. The presence of MWCNTs increases the sPS crystallization temperature, broadens the crystallite size distribution and favors the formation of the thermodynamically stable β phase, whereas it has little effect on the sPS γ to α phase transition during heating. By adding only 1.0 wt.% pristine MWCNTs, the increase in the onset degradation temperature of the composite can reach 20 °C. The electrical conductivity is increased from 10−10∼−16 (neat sPS) to 0.135 S m−1 (sPS/MWCNT composite with 3.0 wt.% MWCNT content). Our findings provide a simple and effective method for carbon nanotube dispersion in polymer matrix with dramatically increased electrical conductivity and thermal stability.
Co-reporter:Ying Wu, Xiaozhong Qu, Liyan Huang, Dong Qiu, Chengliang Zhang, Zhengping Liu, Zhenzhong Yang, Lin Feng
Journal of Colloid and Interface Science 2010 Volume 343(Issue 1) pp:155-161
Publication Date(Web):1 March 2010
DOI:10.1016/j.jcis.2009.11.041
Hollow nanocapsules with both photoswitchable-fluorescent and reversible-photochromic properties are synthesized via a one-pot non-templating microemulsion copolymerization using methyl methacrylate and methacrylated spiropyran as co-monomers. The strong photoswitchable fluorescence of the nanocapsules are switched between “on” and “off” by alternating irradiation of ultraviolet and visible light, which causes the reversible photoisomerization between spiropyran and merocyanine in the nanocapsules. The distribution of spiropyran/merocyanine in a nanocapsule is mostly incorporated inside the wall of the nanocapsule, with only about 17.7% on the surface of the wall. This confinement is the reason of the unusually strong fluorescence of the merocyanine form yielded by the UV radiation. For the same reason, the photochemical stability of the chromophores is increased compared to those in the solution of water/DMF mixture.The strong photoswitchable fluorescence of the poly(methyl methacrylate-methacrylated spiropyran) nanocapsules can be reversibly switched between “on” and “off” by alternating irradiation of ultraviolet (365 nm) and visible light (>450 nm).
Co-reporter:Guoyou Cui;Jun Li;Junyan Dou
Macromolecular Chemistry and Physics 2010 Volume 211( Issue 11) pp:1222-1228
Publication Date(Web):
DOI:10.1002/macp.200900644
Co-reporter:Ying Wu, Chengliang Zhang, Xiaozhong Qu, Zhengping Liu and Zhenzhong Yang
Langmuir 2010 Volume 26(Issue 12) pp:9442-9448
Publication Date(Web):April 26, 2010
DOI:10.1021/la100458j
Composite colloids were prepared via grafting optically responsive spiropyran polymer brushes onto silica colloids. Similar to spiropyran, the polymer brushes undergo a reversible inversion from a hydrophobic state to a hydrophilic state upon irradiation with UV light (or vice versa by visible light). The composite colloids can thus reversibly transfer between oil and water phases, and this can be remotely triggered using light. At intermediate stages of irradiation, both hydrophobic and hydrophilic components coexist, resulting in the amphiphilic performance of the composite colloids. Such amphiphilic composite colloids can be used as particulate emulsifiers.
Co-reporter:Ying Wu, Liyan Huang, Zhengping Liu, Zhenzhong Yang
Polymer 2010 Volume 51(Issue 14) pp:3075-3082
Publication Date(Web):24 June 2010
DOI:10.1016/j.polymer.2010.04.056
A facile no-template approach for fabricating curved polystyrene (PS) nanosheets by miniemulsion polymerization technique was developed. Two essences of the high hydrophobicity of oil phase and the existence of cross-linking comonomer were found to ensure the stable curved sheet-like morphology. Here, when choosing tetradecane as the hydrophobic oil phase and divinylbenzene as cross-linker, the curved PS nanosheets with stable structure were obtained. Furthermore, after introducing functional groups by sulfonation reaction, these curved PS nanosheets can be used as a general template for preparing curved sheet-like inorganic/organic nanocomposites with broadly varied inorganic ingredients, such as metal Ag nanoparticles, inorganic titania, silica, etc. Otherwise, when calcining or carbonizing these inorganic/organic nanocomposites under air or nitrogen, novel mesoporous or microporous pure inorganic nanomaterials with curved sheet-like morphology were obtained conveniently further.
Co-reporter:RuoChen Liu
Science Bulletin 2009 Volume 54( Issue 12) pp:2028-2032
Publication Date(Web):2009 June
DOI:10.1007/s11434-009-0217-0
Various morphologies of polythiophene have been designed and successfully prepared by chemical oxidative polymerization in the presence of phase transfer catalyst (PTC) cetyltrimethylammonium bromide (CTAB) in aqueous medium. The morphologies of polythiophene could be controlled in ribbons, fibers and spherical particles by changing the concentrations of reductant, oxidant and phase transfer catalyst. The structure, thermal stability and the conductivity have been characterized, and a mechanism for the transformation of the morphology of polythiophene has been proposed.
Co-reporter:Qiaohong Peng, Khalid Mahmood, Ying Wu, Zhengping Liu, Li Wei, Hua Yuan, Ruixia Yang
Molecular Catalysis (June 2017) Volume 434() pp:140-145
Publication Date(Web):1 June 2017
DOI:10.1016/j.mcat.2017.03.008
•BAILs and SnCl2·2H2O were used as novel binary catalysts for melt polycondensation of L-lactic acid.•BAILs have special ionic structures and moderate acidity.•Binary catalysts show better catalytic efficiency compared to the single component.•Compared with the conventional binary catalysts, BAILs/SnCl2·2H2O could improve the thermal properties of PLLA.Sulfonic acid-functionalized task-specific ionic liquids, named as Brønsted acidic ionic liquids (BAILs), stable to water, vacuum and heat, have shown excellent catalysis for esterification. BAILs with imidazolium cation and different anions were reasonably applied as catalysts or cocatalysts of stannous chloride dihydrate (SnCl2·2H2O) for melt polycondensation of l-lactic acid under relatively high vacuum and temperature. Binary catalysts of BAILs and SnCl2·2H2O always presented higher catalytic efficiency compared with the single component. We carefully investigated the influences of acidity and ionic structures of BAILs, amount of catalysts and pressure on polycondensation rate and molecular weight and properties of poly(l-lactic acid) (PLLA). Compared to the traditional binary catalysts of p-toluenesulfonic acid/SnCl2·2H2O, BAILs/SnCl2·2H2O could improve the thermal properties of the products. PLLAs with high molecular weight, good crystallinity, high optical purity and regular stereostructure were synthesized and characterized by GPC, DSC, 13C NMR, XRD and polarimeter.Download full-size image
Co-reporter:Zhiju Zhao, Taixin Chen, Shuting Jiang, Zhengping Liu, Decai Fang and Yong Qiang Dong
Journal of Materials Chemistry A 2016 - vol. 4(Issue 21) pp:NaN4804-4804
Publication Date(Web):2016/04/20
DOI:10.1039/C6TC00972G
Through the combination of a large conjugation core and peripheral phenyl rings, one mechanochromic (MC) luminogen (3) with multicolored and high contrast emission is facilely obtained. Luminogen 3 shows aggregation-induced emission (AIE) and crystallization enhanced emission (CEE). The emission of 3 can be switched between deep blue (432 nm, ΦF = 42.2%), green (492 nm, ΦF = 59.3%), and orange (584 nm, ΦF = 0.4%) with high contrast in both color and efficiency through morphology tuning by heating, mechanical stimuli, and solvent fuming. The multicolored and high contrast MC emission of 3 affords its potential application in optical recording. A single luminogen of 3 can form a green or deep blue emissive background on a piece of weighing paper, and weak orange emissive letters could be obtained through writing on both backgrounds. Letters on the green background transfer to deep blue upon fuming with methanol, and those on the deep blue background transfer to green upon fuming with acetone. All the letters could be erased through grinding or heating at 160 °C.
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