Effect of chemical compositional distribution on solid-state structures and properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Effect of chemical compositional distribution on solid-state structures and properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
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DOI：
10.1016/j.polymer.2004.01.025
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发表时间：
2004-03
期刊：
影响因子：
4.6
通讯作者：
N. Yoshie;M. Saito;Y. Inoue
中科院分区：
文献类型：
--
作者：
N. Yoshie;M. Saito;Y. Inoue
比较了聚（3-羟基丁酸酯-co-3-羟基戊酸酯）[PHB-HV] 和表现出共结晶的 PHB/PHB-HV 共混物之间的固态结构和结晶动力学。作为可共结晶共混物，使用表现出完全共结晶（即结晶相中的PHB含量与整个共混物的相同）的共混物，以及形成富含PHB的结晶相的共混物。共晶相中的PHB和HV含量通过高分辨率固态13 C NMR光谱测定。为了以最小的实验误差确定这些含量，使用位点特异性13 C标记的PHB/PHB-HV共混物和PHB-HV共聚物。分别通过广角X射线衍射、小角X射线散射、偏光显微镜和差示扫描量热法分析结晶度、层状结构、球晶生长速率和熔融行为。在这些数据中，在完全共结晶的 PHB/PHB-HV 共混物和具有相同总 HV 含量的 PHB-HV 共聚物之间没有观察到差异。另一方面，形成富含PHB的结晶相的PHB/PHB-HV共混物的非晶层比具有相同总HV含量的PHB-HV共聚物的非晶层更厚。根据收集到的数据，讨论了 PHB-HV 共聚物和共结晶 PHB/PHB-HV 共混物在固态结构和性能方面的相似性和差异。
Solid-state structures and crystallization kinetics were compared between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHB-HV] and PHB/PHB-HV blends exhibiting the cocrystallization. As cocrystallizable blends, both the blends showing complete cocrystallization, i.e. the PHB content in the crystalline phase is the same as that of the whole blends, and the blends forming a PHB-rich crystalline phase were used. The PHB and HV content in the cocrystalline phase were determined by high-resolution solid-state13C NMR spectroscopy. In order to determine these contents with a minimum experimental error, site-specific13C-labeled PHB/PHB-HV blends and PHB-HV copolymers were used. The crystallinity, lamellar structures, spherulite growth rate, and melting behavior were analyzed by wide-angle X-ray diffraction, small-angle X-ray scattering, polarized microscope, and differential scanning calorimetry, respectively. In these data, no difference was observed between the complete-cocrystallizable PHB/PHB-HV blends and the PHB-HV copolymers with the same overall HV content. On the other hand, the PHB/PHB-HV blends forming a PHB-rich crystalline phase has the amorphous layers thicker than that of the PHB-HV copolymers with the same overall HV content. Based on the collected data, the similarity and differences in the solid-state structures and properties between PHB-HV copolymers and cocrystallizable PHB/PHB-HV blends were discussed.