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Synthesis of Copolymers of Ester Contained Organic Silicon and Gas Permeabilities of their Memnranes

Su Binglu, Wang Shaoxin, Hou Xiaohuai, Chen Guanwen (Institute of Chemistry, Academia Sinica, Beijing 100080)  
A study was made on the synthesis of copolymers by copolycondensation reaction of α,ω-dihydroxy-polydimethlsiloxane (Ⅱ) and glycol (Ⅲ) witrh diethyl-2-(N,N-dimethylaminobenzyl) malonate (Ⅰ), on their membrane preparation and from form the viewpoint of the interaction between electron accepter and donor, a discussion was made on the gas permeabilities for O_2 and N-2 through the membranes.It was shown that the copolymers can be obtained by copolycondensation; the copolymers can be prepared into dense membranes by casting the copolymer with alittle vulcanizing agent onto a glass plate. The elastomeric membranes have better mechanical strength than PDMS. The permeabilities for O_2(Po_2) are of the same order of magnitude as PDMS, the values of permeability ratio of O_2 to N_2(Po_2/P_(N_2)) through the membranes are higher (up to 2.54).
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