SMMA/SMA共聚物共混物的自由体积的热动态特性与相分离行为的PALS研究  

Phase behavior and thermal dynamic properties of free volumeon SMMA/SMA copolymer blend studied by PALS method

作　　者：蒋中英[1] 郁伟中[2] 黄彦君[3] 夏元复[3] 马淑新[1] 

机构地区：[1]伊犁师范学院物理系,伊宁835000 [2]清华大学物理系,北京100084 [3]南京大学物理系,南京210093

出　　处：《物理学报》2006年第6期3136-3140,共5页Acta Physica Sinica

基　　金：新疆维吾尔自治区高等学校科学研究计划(批准号:XJEDU2005127)资助的课题~~

摘　　要：基于自由体积理论,利用正电子湮灭寿命谱仪(PALS)分别研究在不同升温速率条件下,聚苯乙烯-甲基丙烯酸甲酯共聚物(SMMA)和聚苯乙烯-马来酸酐共聚物(SMA)混合物(30/70)的自由体积参数的温度依赖性,探索相容共混物相行为的热动态特性.在PALS实验中,在玻璃化转变温度Tg以上,当结构松弛的弛豫时间与等温停留时间相当,发现在某一段温度范围内,共混物的自由体积参数随着温度的变化明显地偏离线性关系.从自由体积孔的浓度I3值在该段的变化趋势,初步推断共混物在该温度段经历了相分离的成长阶段.The temperature dependence of the free volume in SMMA/SMA （30/70） blend was investigated by the positron annihilation life spectroscopy （PALS） at different heating rates according to the free volume theory, and the thermodynamics characteristics of the phase behavior of the polymer blends was also explored. At temperatures above Tg, we found from the positron annihilation life spectra that when the structural relaxation time is comparable with the retention time, the temperature dependence of the free volume parameters obviously departs from the linear relation. Based upon the change tendency of the free volume concentration I3 with temperature, it is postulated that there is a growing stage of the phase separation in the same temperature range.

关 键 词：正电子湮没 正电子素 聚合物共混物 相分离 

分 类 号：O631.3[理学—高分子化学]