writer：Yang Jinjun, Chen Yichun, Hua Lei, Liang Rong, Zhu Dianxing
keywords：Crystallization behavior, Polymorphism, Nucleating agent
source：期刊
specific source：Journal of Applied Polymer Science
Issue time：2016年

The effect of anhydrous orotic acid (OA), as a biocompatible nucleating agent (NA), on the non-isothermal and isothermal crystallization behaviors, polymorphic crystalline structure and phase transition of poly(1,4-butylene adipate) (PBA) was investigated. It is found that the OA increased the crystallization temperature of the PBA in the non-isothermal crystallization process and decreased the crystallization time of the PBA in the isothermal crystallization process. Meanwhile, the spherulite size decreased and spherulite density increased for the PBA. The OA favored the formation of the PBA a-form crystal, compared to the neat PBA. In addition, upon incorporation of the OA, the b-to-a phase transition rate was enhanced significantly. Mechanisms for the preferential formation of the PBA a-form crystal and the accelerated phase transition have also been proposed.