HuiMin Qi

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Name: 齐会民; Qi, HuiMin

Organization: East China University of Science and Technology , China

Department:

Title: Professor(PhD)

Chemicals
References

Thermal curing and degradation behaviour of silicon-containing arylacetylene resins

Co-reporter:Kangkang Guo, Ping Li, Yaping Zhu, Fan Wang, Huimin Qi

Polymer Degradation and Stability 2016 Volume 131() pp:98-105

Publication Date(Web):September 2016

DOI:10.1016/j.polymdegradstab.2016.07.006

Silicon-containing aryacetylene resins (PSAs) have already shown potential application as heat-resistant materials due to their excellent thermal stability. The formation and degradation of structures in cured PSAs are very important to evaluate the thermal properties during their applications. Herein, the thermal curing and degradation behavior of PSAs with different substituents were investigated by DSC, FT-IR, Py-GC-MS, TGA and TG-GC-MS. DSC and FT-IR analysis reveals that the curing reaction is dominated by the crosslinking reaction of CCH and SiCC, meanwhile, the reactive substituents (such as SiH and SiCHCH2) could promote the CCH and SiCC reaction with higher conversion. Py-GC-MS was used to detect the pyrolysis products at 650 °C and 750 °C, respectively, and the results could provide important information about the curing reaction and structures of cured PSAs. The curing reaction of PSAs mainly contains cyclotrimerization and Diels-Alder reaction of CCH and SiCC, and some addition reaction to form polyene structure. The main structures in cured PSAs contain a lot of phenyl rings, some aromatic fused rings and a little of polyene structure, moreover, their contents in cured PSAs are dependent on the substituents of the precursors. The TGA results show that the substituents of SiH and SiCHCH2 can effectively improve the crosslinking index of the cured PSA-H and PSA-V, and endow them with better thermal stability. Additionally, the degradation behavior of cured PSAs have been well studied by TG-GC-MS. When the temperature is 400 °C, the SiCH3 and some aliphatic structure begin to degrade and form CH4, and with the temperature increasing to 500 °C, the unsaturated and aliphatic structures decompose into C2H4 and C2H6, and after 600 °C, the aromatic rings and fused rings in cured PSAs are dehydrogenated and release H2. In addition, the content of the degradation products and their forming temperature are also related with the substituents.

Fabrication of boron- and nitrogen-doped carbon nanoparticles by stress from pyrolysis of borazine-containing arylacetylene

Co-reporter:Kangkang Guo, Huimin Qi, Fan Wang and Yaping Zhu

RSC Advances 2014 vol. 4(Issue 12) pp:6330-6336

Publication Date(Web):15 Nov 2013

DOI:10.1039/C3RA45775C

Novel carbon nanoparticles doped with boron and nitrogen were prepared though curing and pyrolysis of the borazine-containing arylacetylene polymer (PBZA). PBZA was obtained by the condensation reaction between B,B′,B′′-trichloroborazine and an arylacetylene Grignard reagent, and borazine was introduced onto each structure unit of the polymers to satisfy the doping of boron and nitrogen. The PBZA would release amounts of heat and form a three-dimensional network structure after curing, which causes amounts of stress and produces many nano-cracks. The cured PBZA would form h-BCN (hexagonal BCN) crystals and nanocrystals after carbonization. The formation of carbon nanoparticles can be considered to consist of two stages. The first stage is that PBZA is cured and divided into many nano-regions by nano-cracks from the thermal stress produced by curing and pyrolysis. The second stage is that with the temperature increasing further, stress is produced by the formation of h-BCN and nanocrystalline graphite, which promotes the formation of nanosphere-like particles.

Borazine-containing arylacetylene resin as low dielectric constant materials

Co-reporter:Kangkang Guo, Huimin Qi, Fan Wang, Yaping Zhu

Materials Science and Engineering: B 2014 Volume 186() pp:7-14

Publication Date(Web):August 2014

DOI:10.1016/j.mseb.2014.03.001

•A novel borazine-containing arylacetylene resin (PBZA) was synthesized.•PBZA could be cured to form hybrid structure with borazine and aromatic rings.•Cured PBZA shows low dielectric constant (ca. 2.7) and low dielectric loss (<0.002).A novel borazine-containing arylacetylene resin (PBZA) has been synthesized in high yield through condensation reaction between B,B′,B″-trichloroborazine and arylacetylene Grignard reagent, which are potential candidates as low dielectric constant material for microelectronic packaging and also radio and microwave frequency substrate. The PBZA is a brown viscous liquid and soluble in a variety of common solvents. PBZA could be cured by polymerization of alkynyl groups to form organic–inorganic hybrid structure containing borazine ring and aromatic rings with exothermic polymerization temperature in the 190–250 °C range and the structure exhibits great dependence on the substituent on borazine in PBZA. The cured PBZA exhibits high thermal stability with char yield up to nearly 80% at 1000 °C and great chemical stability. Especially, the cured PBZA shows low dielectric constant (ca. 2.7) and extremely low dielectric loss (<0.002). The cured PBZA under higer annealing temperatures exhibits lower dielectric constant and dielectric loss.

Synthesis and characterization of acetylene-terminated polybenzoxazines based on polyaralkyl-phenolic prepolymer

Co-reporter:Huimin Qi;Guangyan Pan;Yuanqi Zhuang;Farong Huang ;Lei Du

Polymer Engineering & Science 2010 Volume 50( Issue 9) pp:1751-1757

Publication Date(Web):

DOI:10.1002/pen.21701

Abstract

Xylok polybenzoxazine with acetylene group terminals (XPBZAs) were synthesized by the Mannich-like condensation of Xylok prepolymer, formaldehyde, aminophenylacetylene, and aniline, and their structures were characterized by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (¹H NMR). The curing behavior of XPBZAs was determined by differential scanning calorimetry and FTIR. Thermal behavior and dynamic mechanical properties of the cured XPBZAs were investigated using thermogravimetric analysis and dynamic mechanical analysis. The results showed glass transition temperature (T_g), the thermal stability, and anaerobic char residue of cured XPBZAs increased as the content of acetylene groups increased. POLYM. ENG. SCI., 50:1751–1757, 2010. © 2010 Society of Plastics Engineers

Synthesis and characteristic of polybenzoxazine with phenylnitrile functional group

Co-reporter:Huimin Qi;Hao Ren;Guangyan Pan;Yuanqi Zhuang;Farong Huang ;Lei Du

Polymers for Advanced Technologies 2009 Volume 20( Issue 3) pp:268-272

Publication Date(Web):

DOI:10.1002/pat.1261

Abstract

The phenylnitrile functional benzoxazine monomers, 3-phenyl-3,4-dihydro- 6-nitril-2H-1,3-benzoxazine (NBen-a) and 4,4′-bis(3,4-dihydro-6-nitril-2H-1,3-benzoxazine-3-yl)phenylether (NBen-De), were synthesized and characterized by Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance (¹H-NMR). The curing behaviors of NBen-a and NBen-De were characterized by differential scanning calorimetry (DSC) and FTIR. Thermal stability and dynamic mechanical properties of the cured NBen-a and NBen-De were investigated using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The cured NBen-a and NBen-De showed glass transition temperature (T_g), the thermal stability improved as compared to the analogous polybenzoxazine without phenylnitrile group. Copyright © 2008 John Wiley & Sons, Ltd.

Preparation and characterization of high char yield polybenzoxazine/polyarylacetylene blends for resin-transfer molding

Co-reporter:Huimin Qi;Guangyan Pan;Lian Yin;Yuanqi Zhuang;Farong Huang ;Lei Du

Journal of Applied Polymer Science 2009 Volume 114( Issue 5) pp:3026-3033

Publication Date(Web):

DOI:10.1002/app.30946

Abstract

Benzoxazine precursors (BOZP), 6,6′-bis(2,3-dihydro-3-(3-ethynylphenyl)-4H-1,3- benzoxazinyl)ketone and 6,6′-bis(2,3-dihydro-3-(3-ethynylphenyl)-4H-1,3-benzoxazinyl)ether were synthesized and characterized by Proton nuclear magnetic resonace (¹H-NMR) and Fourier transform infrared spectroscopy (FTIR). The polyarylacetylene (PAA) was synthesized through thermal polymerization of diethynylbenzene, and characterized by ¹H-NMR, FTIR, and Differential Scanning Calorimetry (DSC). The BOZP/PAA blends were prepared with different contents of PAA, and their viscosity was measured using NDJ-79 rotating visometer. The curing behavior of BOZP/PAA blends was characterized by DSC. The thermal stability of cured BOZP/PAA blends was studied using Thermogravimetric Analysis, the results show char yield at 800°C was in the range of 78–84%. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009