Co-reporter:Shuqian Zhou;Yajun Mao;Zhengfa Zhou
Journal of Coatings Technology and Research 2017 Volume 14( Issue 6) pp:1457-1461
Publication Date(Web):17 August 2017
DOI:10.1007/s11998-017-9959-9
New high refractive index monomer of 2,5-bis(methylallyl thioester)-thiadiazole (BMATETDZ) containing thioester and dithiazole was synthesized by a one-step condensation reaction with methyl acryloyl chloride and 2,5-dimercaptothiadiazole (DTD). N–N=(C), C=O, and C–S with high molar refraction groups were introduced into the structure of BMATETDZ. FTIR and 1H NMR were used to characterize the molecular structure of BMATETDZ. The refractive index of BMATETDZ was 1.661. The coatings of poly (2,5-bis(methylallyl thioester)-thiadiazole) (C-PBMATETDZ) on polyethylene terephthalate (PET) film were prepared by photopolymerization under UV irradiation. The C-PBMATETDZ coatings exhibited better comprehensive properties with high refractive index, high hardness, good adhesive force, excellent thermal stability, and high transparency in range of 200–900 nm.
Co-reporter:Fengmei Ren;Ran Zhou;Fang Sun;Haihong Ma;Zhengfa Zhou
RSC Advances (2011-Present) 2017 vol. 7(Issue 47) pp:29779-29785
Publication Date(Web):2017/06/05
DOI:10.1039/C7RA04454B
The surface of alumina (Al2O3) particles was modified by a blocked isocyanate silane coupling agent, which was synthesized by using methylethyl ketoxime (MEKO) to block isocyanate-propyltriethoxy silane via nucleophilic reactions. For comparison, the surface of Al2O3 particles was also modified by propyltrimethoxy silane (KH-331). The thermally conductive and electrical insulating Al2O3/polyamide 6 composites were prepared by dispersing modified Al2O3 in polyamide 6 (PA6) using a twin-screw extruder. The X-ray photoelectron spectroscopy (XPS) results revealed that blocked isocyanate-propyltriethoxy silane and KH-331 were successfully attached to the surface of Al2O3 particles with chemical bonds. The blocked isocyanate silane modified Al2O3 were well dispersed in PA6 as revealed by scanning electron microscopy (SEM). When the Al2O3 content was 70 wt%, the tensile strength (85.2 MPa) and flexural strength (136.4 MPa) of blocked isocyanate silane modified Al2O3/PA6 composites were higher than those of KH-331 modified Al2O3/PA6 composites (52.5 MPa, 77.8 MPa), respectively. The thermal conductivity and impact strength of blocked isocyanate silane modified Al2O3/PA6 composites were also higher than that of KH-331 modified Al2O3/PA6 composites at the same content of Al2O3. The volume electrical resistivity of modified Al2O3/PA6 composites decreased with increasing Al2O3 content, but they still were good electrical insulating materials.
Co-reporter:Shuqian Zhou;Zhengfa Zhou;ChenRan Ji;Haihong Ma;Fengmei Ren;Xuefan Wang
RSC Advances (2011-Present) 2017 vol. 7(Issue 80) pp:50603-50609
Publication Date(Web):2017/10/30
DOI:10.1039/C7RA10132E
Thermally expandable microspheres (TEMs), employing PMMA as the shell and NaHCO3/ethanol as the core, were prepared via thermally induced phase separation (TIPS). The addition of NaHCO3 improves the foaming properties of the TEMs. A mechanism for TEMs formation was proposed, comprising the following steps: (1) the separation of homogeneous polymer solutions into polymer-rich and polymer-poor phases upon cooling, where decreases in both interfacial tension and interfacial free energy (ΔG) facilitate sphere formation in a polymer-rich phase located in the polymer-poor phase; (2) the deposition of PMMA and shell formation at the interface, aided by the acute contact angle (θ) and positive spreading coefficient (S); (3) the constant deposition of PMMA shells from both the polymer-rich phase and polymer-poor phase upon cooling; and (4) the detachment of TEMs from each other facilitated by shear force from stirring. This mechanism was supported by calculations, and the effects of quench rates and stirring speeds.
Co-reporter:G. X. Wang;W. B. Xu;Q. Hou;S. W. Guo
Polymer Science, Series B 2016 Volume 58( Issue 3) pp:321-328
Publication Date(Web):2016 May
DOI:10.1134/S1560090416030167
In this study, lauryl alcohol suitable for thermal energy storage applications was microencapsulated in a poly(urea-formaldehyde) shell. The microcapsules were prepared by microwave-assisted in situ polymerization. The morphology and particle size of the poly(urea-formaldehyde)/lauryl alcohol phase change energy storage microcapsules(UF/LA PCESMs) were analyzed using transmission electron microscopy, scanning electron microscopy, atomic force microscopy and dynamic light scattering. The latent heat storage capacities of lauryl alcohol and UF/LA PCESMs were determined using differential scanning calorimetry. The chemical composition of the microcapsules was characterized using Fourier transform infrared spectroscopy. All of the results show that UF/LA PCESMs were synthesized successfully and that the latent heat storage capacity and encapsulation efficiency were 156.0 J/g and 75.0%, respectively, and the diameter of each microcapsule was around 150 nm.
Co-reporter:Guxia Wang, Weibing Xu, Qian Hou, Shengwei Guo
Ultrasonics Sonochemistry 2015 Volume 27() pp:403-407
Publication Date(Web):November 2015
DOI:10.1016/j.ultsonch.2015.06.007
In this study, stearic acid suitable for thermal energy storage applications was nanoencapsulated in a poly(methyl methacrylate) shell. The nanocapsules were prepared using a simple ultrasonically initiated in situ polymerization method. The morphology and particle size of the poly(methyl methacrylate)/stearic acid phase change energy storage nanocapsules (PMS-PCESNs) were analyzed using transmission electron microscopy, scanning electron microscopy, atomic force microscopy and dynamic light scattering. The latent heat storage capacities of stearic acid and the PMS-PCESNs were determined using differential scanning calorimetry. The chemical composition of the nanocapsules was characterized using Fourier transform infrared spectroscopy. All of the results show that the PMS-PCESNs were synthesized successfully and that the latent heat storage capacity and encapsulation efficiency were 155.6 J/g and 83.0%, respectively, and the diameter of each nanocapsule was 80–90 nm.
Co-reporter:Fengmei Ren;Haihong Ma;Wei Hu;Zhengfa Zhou
Journal of Applied Polymer Science 2015 Volume 132( Issue 29) pp:
Publication Date(Web):
DOI:10.1002/app.42300
ABSTRACT
Sn-doped CdS/TiO2 heterojunction was synthesized on the conducting polymer fiber mat by hydrothermal method. The conducting polymer fiber mat was made by electrospinning from polyvinylidene fluoride, styrene-maleic anhydride copolymer, and nano-graphites as conducting fillers. The Sn-doped CdS/TiO2 heterojunction was characterized by XRD, XPS, SEM, TEM, TGA, and UV–Vis absorption spectra. Under simulated solar light irradiation, a combination of Sn-doped CdS/TiO2/conducting polymer was found to be highly efficient for photocatalytic hydrogen evolution from splitting of water. The photocatalytic hydrogen production efficiency was up to 2885 μmol h−1 g−1cat. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42300.
Co-reporter:Zhengfa Zhou;Hongxiang Lv;Xiaowen Wang;Fengmei Ren
Journal of Applied Polymer Science 2013 Volume 128( Issue 1) pp:597-599
Publication Date(Web):
DOI:10.1002/app.38238
Abstract
A water-soluble and low stimulation sodium bisulfite blocked isophorone diisocyanate (IPDI) has been prepared. The blocking and deblocking of the blocked IPDI is observed by hot-stage Fourier transform infrared (FTIR) spectrophotometer. The experimental results reveal that IPDI is successfully blocked by sodium bisulfite and the blocked IPDI can regenerate isocyanate groups when the temperature is higher than 80°C. Differential scanning calorimetry analysis indicates that blocked IPDI deblocks initially at around 85°C and reaches the maximum deblocking rate at 117°C. The blocked IPDI in liquid and solid states are stable after being stored for 12 months at room temperature. The blocked IPDI is used as curing agent for waterborne hydroxyl polyurethane, which has good adhesive performance and long pot life. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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