摘要
用ＩＲ、ＤＳＣ、ＷＡＸＤ、正交偏光显微镜、ＳＥＭ、ＴＥＭ等手段，表征了所合成的液晶／烃橡胶／硅橡胶三元共混复合膜的织态结构及液晶态转变．结果发现，液晶ＰＥＥＣＢ—４．０５由于与ＳＢＲ和ＰＤＭＳ共混，Ｔｋ－ｓ转变温度下降了３７．５℃，体系存在不完全的相分离．液晶ＰＥＥＣＢ—４．０５在体系中形成液晶富集区（ＬＣ—ｒｉｃｈｄｏｍａｉｎ），大小约０２—２．２μｍ不等．在压力的作用下，连续的液晶富集区形成宽约７．０μｍ并垂直于膜的平面的通道．这些结果是第Ⅰ报中这类富氧膜透气率产生突变的根本原因．
The compatibility,miscibility, membrane-formability, structure and LC transition properties of PEECB-4.05(α,ω-polyethylene glycol(DP=4.05)-p-ethoxycarbonyloxybenzoate)/hydrocarbon rubber(SBR,PB)/PDMS(Mw=370×103) composite membrane PDLCM have been charactenAn by IRS DSC, WAXD, cross-polarized microscope and SEM, TEM etc. Results showed that PEECB-4.05'sTk-s(transition temperature from crystal state to LC state) has been downed 37.5 ℃ to ambient temperature in SBR/PEECB-4.05/PDMS system because of the intcractions between the components. There exists imperfect micro-phase separation in the system and LC-rich domains have been formed(domain size: from 0.2 to 2.2 micron depending on the content of PEECB-4.05). These despersed domains gradually changed to continuous phase with the increase of PEECB-4.05's content,resulting in the formation of large number of LC channels upon the action of gas pressure permeated. The mechanism of PEECB-4.05 TK-s's downing has been investigated.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1995年第6期672-678,共7页
Acta Polymerica Sinica
基金
高等学校博士学科点基金
关键词
富氧膜
液晶
气体分离
PDLCM
Oxygen-ennchment membrane, Liquid crystal, Micro-phase mparation,Gas separation
