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首页> 外文期刊>Journal of Applied Polymer Science >Polymorphic crystallization of poly(butylene adipate) and its copolymer: Effect of poly(vinyl alcohol)
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Polymorphic crystallization of poly(butylene adipate) and its copolymer: Effect of poly(vinyl alcohol)

机译：聚己二酸丁二酯及其共聚物的多晶型结晶：聚乙烯醇的作用

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摘要

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 β-type 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.
机译：聚乙烯醇（PVA）覆盖的微粒和纳米颗粒中可生物降解的多晶型聚合物聚己二酸丁二酯（PBA）和聚己二酸丁二酯-己二酸共己二酯）的结晶动力学和晶体结构通过差示扫描量热法，广角X射线衍射和傅里叶变换红外光谱研究了PVA基板上的金属。在非等温熔体结晶中，​​以颗粒状态和在PVA基底上结晶的聚合物均显示出较高的结晶温度，而在等温结晶中则显示出较短的结晶时间。这表明与大体积样品相比，颗粒状态和PVA基材上的聚合物结晶更快。此外，与处于本体状态的聚合物相比，处于颗粒状态且位于PVA基底上的聚合物表现出优先形成PBA的β型结晶形式。讨论了PVA层或基材对PBA及其共聚酯的结晶动力学和晶体结构的影响机理。

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