Synthesis and gas permeability of poly(tetramethyl-p-silphenylenesiloxane)polydialkylsiloxane) block copolymers containing fluoroalkyl substituents
Synthesis and gas permeability of poly(tetramethyl-p-silphenylenesiloxane)polydialkylsiloxane) block copolymers containing fluoroalkyl substituents
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DOI：
10.1016/0032-3861(88)90093-6
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发表时间：
1988-04
期刊：
影响因子：
4.6
通讯作者：
Y. Nagase;J. Ochiai;K. Matsui;Masaki Uchikura
中科院分区：
文献类型：
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作者：
Y. Nagase;J. Ochiai;K. Matsui;Masaki Uchikura
Abstract Poly (tetramethyl-p-silphenylenesiloxane) poly (dialkylsiloxane)(PTMPS/PDAS) block copolymers containing various kinds of fluoroalkyl substituents were synthesized. The gas permeability of the copolymer membranes was evaluated. The PTMPS contents of the copolymers could be controlled in the range 20–80 mol%, and the weight average molecular weights were more than 10 5. Very tough and thin membranes could be prepared from these copolymers by a solvent casting method. The oxygen permeability coefficient P O 2 of the copolymer membranes increased as PTMPS content decreased, and was independent of the kinds of substitution. When PTMPS content was below 40 mol%, the P O 2 of every copolymer membrane was more than 1× 10− 8 cm 3 (stp) cm cm− 2 s− 1 cmHg− 1. The fluoroalkyl substituents affected the selectivity P O 2 P N 2. The values of P O 2 P N 2 for PTMPS/PDAS block copolymers were higher than those of PTMPS/poly (dimethylsiloxane) block copolymers, which did not contain the fluoroalkyl group. Some of these copolymers showed excellent oxygen permselectivity, with values of P O 2 and P O 2 P N 2 in the range 10− 8− 3× 10− 8 cm 3 (stp) cm cm− 2 s− 1 cmHg− 1 and 2.30–2.50, respectively.
