苯乙烯-丙烯酸取代乙酯共聚物的介电性能

DIELECTRIC PROPERTIES OF STYRENE-SUBSTITTUTED ETHYLACRYLATE COPOLYMERS

合成了一系列苯乙烯与丙烯酸取代乙酯CH_2=CHCOOCH_2CH_2-X(X=F、Cl、Br、CN、OCH_s)的自由基共聚物。与苯乙烯或丙烯酸取代乙酯的均聚物相比,它们的成膜性能有较大的改善。共聚物的介电性能(ε、thδ)随测试频率、共聚物组成呈现一定规律的变化,在相同的条件下,共聚物的介电性能大致上随丙烯酸酯单元上取代基的极性增大而升高。

A Series of copolymers from styrene and substituted ethylacrylates CH2=CHCOOCH2CH2-X (X = F,Cl,Br,CN,OCH3,H) were synthesized. According to the compositions, the copolymers were from hard plastics to elastomers, their dielectric properties (εand tgδ) located between the two corresponding homopolymers and changed with compositions, frequency and substitut groups. The toughness of copolymers was higher than that of polystyrene, and they had better film-forming characters than the homopolymers.