Polymorphic Crystallization of Poly(butylene adipate) and Its Copolymer: Effect of Poly(vinyl alcohol)
作者：Liang Zhichao, Yang Jinjun, Hua Lei, Pan Pengju, Huang Jian, Zhang Jianjun, Abe Hideki, Inoue Yoshio
关键字：Polymorphism, Copolymer
论文来源：期刊
具体来源：Journal of Applied polymer Science
发表时间：2014年
The crystallization kinetics and crystalline structure of the biodegradable polymorphic polymers, poly(butylene adipate) (PBA) and poly(butylene adipate-co-hexamethylene adipate), in the microparticles and nanoparticles covered by poly(vinyl alcohol) (PVA), and those on the PVA substrate were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, and Fourier transform infrared spectroscopy. Both the polymers crystallized in the particle state and on the PVA substrate showed higher crystallization temperatures in the nonisothermal melt crystallization and shorter crystallization times in the isothermal crystallization; this indicated a faster crystallization of the polymer in the particle state and on the PVA substrate than that of the bulk sample. Furthermore, the polymers in the particle state and on the PVA substrate showed the preferential formation of the btype crystalline form of PBA compared to the bulk one. The mechanism for the effects of the PVA layer or substrate on the crystallization kinetics and crystalline structure of PBA and its copolyesters are discussed.