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Citation: HU Yanming, YUAN Xuecheng, LI Zhansheng, MASUDA Toshio. Synthesis and Gas Permeation Properties of Polyacetylenes Containing Biphenyl Pendent Groups[J]. Chinese Journal of Applied Chemistry, ;2012, 29(6): 617-622. doi: 10.3724/SP.J.1095.2012.00313 shu

Synthesis and Gas Permeation Properties of Polyacetylenes Containing Biphenyl Pendent Groups

1.
a Department of Polymer Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;
2.
b Department of Environmental and Biological Chemistry, Fukui University of Technology, Fukui 910-8505, Japan

Corresponding author: HU Yanming,
Received Date: 18 July 2011
Available Online: 14 September 2011
Fund Project: 教育部留学回国人员科研启动基金[教外司留(2010)1174]资助项目 (2010)

Diarylacetylene monomers(1a~1d) containing substituted biphenyl and Si groups were synthesized and then polymerized with TaCl₅-n-Bu₄Sn catalyst to generate the corresponding polymers(2a,2b,and 2d).The produced polymers showed good solubility in common organic solvents.Polymers 2a and 2b afforded free standing membranes by casting from their toluene solution.Desilylation of membranes 2a and 2b was carried out with trifluoroacetic acid to give membranes 3a and 3b,which were insoluble in any organic solvents.According to thermogravimetric analysis,both the trimethylsilyl-containing and the desilylated polymers exhibited high thermal stability,the onset temperatures of mass loss in air were 340℃ and 430℃,respectively.The oxygen permeability coefficients(P_O₂) of polymers 2a and 2b were 99 and 160 barrers,respectively.Upon desilylation,the P_O₂ of 3a and 3b decreased to 22 and 65 barrers,respectively.The separation factors of oxygen against nitrogen(P_O₂/P_N₂) of the present polymer membranes ranged from 2.4~3.3,and they tend to decrease as the P_O₂ increased.By determining the gas diffusion coefficient(D) and gas solubility coefficient(S),the result indicates that the decrease of gas permeability upon desilylation was mainly derived from the decrease of D value.
- substituted polyacetylene,
- gas permeation,
- gas separation membrane
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