A detailed investigation of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) blended with poly(vinyl phenol) (PVPh) at a 90/10 wt ratio reveals the significant impact of PVPh on crystallization and spherulite morphology. Because PVPh remains in a rigid, glassy state during PHBV crystallization, it restricts molecular movement, leading to a more controlled and organized morphology of the PHBV lamellae. Advanced microscopic analysis highlights the morphological sensitivity to crystallization conditions, with SEM images showing cracks and diverse lamellae orientations. Etching and fracturing expose the interior 3D lamellae architecture, revealing distinct ridge and valley regions where vertically oriented lamellae beneath ridges transition to horizontal lamellae in valleys, resulting in double ring-banded spherulites. Advanced synchrotron-radiation microbeam X-ray techniques provide additional insights into the polymorphic forms and self-assembly behavior of lamellae. The investigation also examines order-induced photonic phenomena by considering that the orderly-banded spherulites can exhibit iridescence. This comprehensive study enhances our understanding of PHBV crystal assembly, underscoring the sophistication of polymer self-assembly at the microscopic level.

中文翻译：

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具有可调结构的聚（3-羟基丁酸酯-co-3-羟基戊酸酯）有序带状球晶的光栅和谐


对聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）与聚乙烯醇酚（PVPh）以90/10重量比共混的详细研究揭示了PVPh对结晶和球晶形态的显著影响。由于 PVPh 在 PHBV 结晶过程中保持刚性玻璃状状态，因此它限制了分子的运动，导致 PHBV 薄片的形态更加受控和有序。先进的显微镜分析突出了对结晶条件的形态敏感性，SEM 图像显示裂纹和不同的薄片方向。蚀刻和压裂暴露了内部 3D 薄片结构，揭示了明显的山脊和山谷区域，其中山脊下方垂直方向的薄片过渡到山谷中的水平薄片，从而形成双环带球晶。先进的同步辐射微束 X 射线技术为薄片的多态形式和自组装行为提供了更多见解。该研究还通过考虑有序带状球体可以表现出彩虹色来检查有序诱导的光子现象。这项全面的研究增强了我们对 PHBV 晶体组装的理解，强调了聚合物自组装在微观层面的复杂性。