甲基丙烯酰氧乙氧基三甲基硅烷-丙烯腈共聚物膜的制备及其气体渗透性能

Preparation and Gas Permeate Performance of Copolymer Membrane of Methacryloyloxy-[ethoxy] trimethylsilane and Acrylonitrile

采用本体聚合的方法以偶氮二异丁腈作为引发剂制备了甲基丙烯酰氧乙氧基三甲基硅烷-丙烯腈共聚物。利用凝胶渗透色谱仪测定了共聚物的数均分子量;红外光谱仪和X射线衍射分析仪测定了共聚物的结构;同步热分析仪测试了共聚物膜的热性能;膜分离测试分析仪测试了共聚物膜的气体渗透性能。结果表明:共聚物的数均分子量随甲基丙烯酰氧乙氧基三甲基硅烷含量的增加而增加,其结构中既含有非晶态结构也含有晶态结构,玻璃化温度约为51℃。共聚物膜对CO2具有优先选择透过性,当温度23℃、压力0.1MPa时,对CO2的渗透系数为129Barrers,对CO2/N2的分离系数达到11.8。

The copolymers of methacryloyloxy-[ethoxy] trimethylsilane and acrylonitrile were prepared by bulk polymerization using azobisisobutyronitrile as initiator. The average molecular weight of the copoly-mer was measured by gel permeation chromatograph. The structure of copolymer was analyzed by infrared spectrometer and X-ray diffractometer. DSC was used to study the thermal property of copolymer membranes. The gas permeation property of copolymer membrane was characterized by gas permeability apparatus. Results showed that average molecular weight of the copolymer increased with the content of methacryloyloxy-[ethoxy] trimethylsilane increasing. There were both amorphous and crystalline in the structure of the copolymer, with glass transition temperature about 51 ℃. The copolymer membrane showed CO2 permeability preferentially. At 23 ℃,0.1 MPa, the CO2 permeability coefficient and CO2/N2 selectivity factor were 129 Barrers and 11.8, respectively.