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极性聚合物的偶极在玻璃化温度以上,可按外施的恒定电场取向.保持该电场并降温使聚合物偶极冻结而形成驻极体。驻极体在升温过程中将逐渐释放被束缚的电荷形成热释电流,该电流随聚合物的结构及其他条件的变化而不同。用热释电流与温度的关系图谱即热释电流谱研究高聚物分子的各级松弛过程,具有简便、分辨率高,灵敏度高的特点.本文叙述了丙烯酸酯类、苯乙烯-丙烯腈共聚物、聚氯乙烯的光氧老化、环氧树脂-不饱和聚酯等的热释电流谱。
Polar polymer dipoles above the glass transition temperature may be applied in a constant electric field orientation. Maintaining the electric field and cooling the polymer dipole to form an electret. The electret gradually releases the bound charge during pyrolysis to form a pyroelectric current that varies with the structure of the polymer and other conditions. It is simple, high resolution and high sensitivity to study the relaxation processes at various levels of polymer molecules by using the relation diagram of pyroelectric current and temperature, that is, pyroelectric current spectrum.In this paper, acrylate, styrene-acrylonitrile copolymerization Photovoltaic Aging of Polyvinyl Chloride, Epoxy-Unsaturated Polyester Pyroelectric Current Spectrum.