摘要
利用正电子寿命谱的ＰＡＴＦＩＴ和ＭＥＬＴ分析程序，研究了多嵌段共聚物对苯二甲酸乙二酯／环氧乙烷（ＰＥＴ／ＰＥＯ）的自由体积特性．从正电子寿命的最长分量随温度的变化发现，多嵌段共聚物有两个玻璃化转变温度，这表明多嵌段共聚物中ＰＥＯ和ＰＥＴ相的互容性较差．根据浅束缚态理论解释了玻璃化转变温度以下最长寿命分量强度的变化规律，并且利用ＭＥＬＴ分析程序得到了自由体积浓度随温度的分布．
Positron annihilation lifetime measurements were performed for the segmented copolymer PET/PEO as a function of temperature in the range of 130￣150 K. According to varieties of the free volume properties, two glass transition temperatures have been determined, which means that there are two kinds of domains in the samples. The size distribution of free volume at different temperature were obtained using the maximum entropy method for positron lifetime spectrum (MELT). \ \
出处
《武汉大学学报（自然科学版）》
CSCD
1999年第1期69-72,共4页
Journal of Wuhan University(Natural Science Edition)
基金
国家自然科学基金
关键词
自由体积
多嵌段共聚物
最大熵原理
PET/PEO
positron annihilation, free volume, segmented copolymer, maximum entropy methods
