摘要
利用正电子湮没寿命谱实验手段研究了22Na放射源的e+自辐射对三嵌段共聚物SEBS的正电子湮没参数的影响,而后结合Eldrup的经典模型,研究了SEBS的自由体积孔尺寸和自由体积分数随着温度的变化关系,给出了自由体积分数在Tg以上和在Tg以下各自区域内分别与温度呈线性关系,最后结合Williams Landel Ferry(WLF)自由体积理论和Eldrup的经典模型讨论了热膨胀系数和自由体积分数中的A常数.
Positron annihilation lifetime spectroscopy was used to study e(+) self-irradiation effect of Na-22 on positron annihilation parameters of SEBS, temperature dependence of free volume hole radius and free volume hole fractional, based on the classic model of Eldrup, presenting the linear variation of fractional free volume versus temperature in vacuum the range below T-g and above T-g, respectively. We also discuss the thermal expansion coefficient and the constant A in free volume fractional formula by combining the free volume theory of WLF and the classical model of Eldrup.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第7期3434-3438,共5页
Acta Physica Sinica
基金
国家自然科学基金重点项目(批准号19835050)资助的课题.~~
