γ辐照聚对苯二甲酸乙二酯驻极体的解俘获电流与分立陷阱

DETRAPPING CURRENT AND DISCRETE TRAPPING LEVELS OF γ-IRRADIATED POLYETHYLENE TEREPHTHALATE ELECTRETS

0.5—4MGy大剂量γ射线辐照聚对苯二甲酸乙二酯(PET)的结果表明,PET分子链断裂,含氧的苯环基团浓度增大。且随辐照剂量提高,受辐照PET驻极体受陷载流子的解俘获电流增大,陷阱深度加深。结构变化导致结构缺陷种类增多,使分立陷阱数由非晶的二个增至四个。

γ-irradiation of a large dose (0.5--4 MGy) leads to the breaking of macromolecular chain and the rising of group density of phenyl with oxygen in(polyethylene terephthalate) (PET) films. The detrapping current of trapped chargecarriers and the depth of trdpping level of irradiated PET electrets increase withincreasing irradiation dose. Due to the change of molecular structure. the kinds ofstructural defect rise resulting in increase of the number of discrete trapping levels(from two of amorphous to four of R-5).