梯形聚甲基倍半硅氧烷(PMSQ)/聚氯乙烯(PVC)共混物的相特性  

PHASE STRUCTURE AND MISCIBILITY OF LADDERLIKE POLYMETHYLSISESQUIOXANE(PMSQ) /POLYVINYLCHLORIDE (PVC)BLENDS

作　　者：李桂芝[1] 贾晓蕾[1] 侯益民[2] 

机构地区：[1]山东大学化学学院 [2]山东省化工规划设计院

出　　处：《山东大学学报（自然科学版）》1999年第1期83-87,共5页Journal of Shandong University(Natural Science Edition)

基　　金：山东大学化学学院院长基金

摘　　要：ＰＭＳＱ／ＰＶＣ（１００／０，７０／３０，５０／５０，３０／７０，０／１００）共混物由溶液浇法制备．经透射电镜观察到该共混物呈微观分相，但两相间界面较模糊；当ＰＶＣ含量增至７０％时，发生相逆转．所有共混物的扭辫曲线均只有唯一的玻璃化转变，并且由扭辫技术测得的ＰＭＳＱ／ＰＣ共混物的Ｔｇ与由经验公式计算值相吻合，ＰＭＳＱ、ＰＶＣ在ＴＢＡ测试尺度上的相容性较好．由于ＰＭＳＱ中的ＳｉＯＨ在第一次升温中当温度高于３１８Ｋ时发生进一步交联反应，所有共混物二次加热后的Ｔｇ均比第一次升温时高。PMSQ/PVC blends with different weight ratios (100/0,70/30,50/50,30/70 and (0/100) had been prepared by solution casting.Microphase separation and no distinct interface among dispersed particles and continuous phase of PMSQ/PVC blends are observed by TEM.Phase-inversion occurs when the percentage of PVC increases to 70%.There is only one glass transition in each TBA curves of PMSQ/PVC blends. T g ′s of the blends measured by TBA are similar with those values calculated from three simulated equations.Miscibility of PMSQ and PVC are very good at the scale of TBA technique. T g ′s of PMSQ/PVC blends at the second heating are higher than those at the first heating due to crosslinking of Si OH in PMSQ molecules as temperature is above 318 K( T g of PMSQ)during the first heating.Heat history has great effect on T g ′s of PMSQ/PVC blends.

关 键 词：PVC 共混物 相结构 相容性 玻璃化转变温度 PMSQ 

分 类 号：O634.41[理学—高分子化学] O632.21[理学—化学]