摘要
半晶性的聚对苯二甲酸乙二醇酯(PET)存在不同尺寸运动单元的多重形式的分子运动,而且PET等高聚物前结构欠序、晶界和杂质等缺陷还使电子价带与导带间的禁带中出现局域能级(陷阱),并成为捕获载流子的中心,从而影响载流子的输运性质。
A series of PET films with different crystallinity (Xe) have been made through annealing at 110℃. The α-peak of short-circuit thermally stimulated current (corresponding to Tg) shifted to the higher temperature region when Xe increased. With the rise of Xc, the activation energy of dipolar thermal relaxation for main chain segmental motion in amorphous phase decreased linearly and the time constant of dipolar thermal relaxation increased exponentially.Crystallization by annealing leads to the increase of the trap depth, but the ability to trap charge carriers showed a maximum when Xe was 22%. ' '
出处
《应用化学》
CAS
CSCD
北大核心
1992年第5期70-73,共4页
Chinese Journal of Applied Chemistry
关键词
结晶
热释电
分子运动
陷阱
PET
poly(ethylene terephthalate), crystallization,thermally stimulated current, molecular motion, trap
