Abstract Ferroelectric behavior was observed in the crystalline copolymers of vinylidene chloride (VDC) with vinylchloride (VC) and with methylacrylate (MA). A D-E hysteresis loop for P(VDC/VC) copolymer observed at above its glass transition temperature indicates the ferroelectricity of this copolymer. The remanent polarization was between 30 and 122 mC/m2, and pyroelectric constants of the copolymers was stable up to almost their melting points. The results of FTIR and XRD suggested that the electric behaviors of P(VDC/VC) copolymers were caused by the orientation of C-Cl dipoles in VDC chains in the crystal region to form a polar structure in a high electric field.

中文翻译：

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偏二氯乙烯共聚物中的铁电行为

摘要 在偏二氯乙烯 (VDC) 与氯乙烯 (VC) 和丙烯酸甲酯 (MA) 的结晶共聚物中观察到铁电行为。在高于其玻璃化转变温度时观察到的 P(VDC/VC) 共聚物的 DE 滞后回线表明该共聚物的铁电性。剩余极化在 30 到 122 mC/m2 之间，共聚物的热电常数稳定到几乎它们的熔点。FTIR和XRD结果表明，P(VDC/VC)共聚物的电行为是由于VDC链中C-Cl偶极子在结晶区取向形成极性结构所致。