Different carbon black (CB) contents in poly(butylene adipate-co-terephthalate) (PBAT)/poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) blends were prepared by melt blending using chain extender multifunctional styrene-acrylic- epoxy random oligomer (ADR), as a compatibilizer. PBAT and P34HB were immiscible, and ADR could react with PBAT and P34HB to improve interfacial adhesion force and molecular entanglement. CB fillers were uniformly and selectively located in the PBAT matrix and could act as a nucleating agent to promote the nucleation of PBAT crystallization. At a CB content of 5 wt%, a percolation network structure of CB was formed. The most interesting result in the work was the achievement of composites with improved rheological and mechanical properties under the synergistic effect of chain extender and CB fillers. The viscoelasticity of the system was markedly improved and a transition from liquid-like to solid-like behavior was observed. Young's modulus and yield strength of chain extender modified PBAT/P34HB/CB composite with 10 wt% CB increased by 502% and 69% compared to neat PBAT, and by 89% and 43% compared to PBAT/P34HB binary blend. The combination of improved melt viscoelasticity and mechanical properties will further broaden the practical application of biodegradable polymers. © 2024 Society of Industrial Chemistry.

中文翻译：

---

炭黑和扩链剂对完全生物降解聚（己二酸-对苯二甲酸丁二醇酯）/聚（3-羟基丁酸酯-4-羟基丁酸酯）共混物的热性能、流变性能和机械性能的影响

采用扩链剂多功能苯乙烯-丙烯酸-聚(PBAT)/聚(3-羟基丁酸酯-co -4-羟基丁酸酯)(P34HB)共混物通过熔融共混制备了不同炭黑(CB)含量的聚己二酸-对苯二甲酸丁二醇酯。环氧无规低聚物（ADR），作为增容剂。 PBAT和P34HB不相溶，ADR可以与PBAT和P34HB发生反应，提高界面附着力和分子缠结。 CB填料均匀、选择性地分布在PBAT基体中，可以作为成核剂促进PBAT结晶成核。当CB含量为5wt%时，形成了CB的渗流网络结构。这项工作中最有趣的结果是在扩链剂和炭黑填料的协同作用下实现了具有改善的流变学和机械性能的复合材料。系统的粘弹性显着改善，并且观察到从液体状行为到固体状行为的转变。含有 10 wt% CB 的扩链剂改性 PBAT/P34HB/CB 复合材料的杨氏模量和屈服强度与纯 PBAT 相比分别提高了 502% 和 69%，与 PBAT/P34HB 二元共混物相比分别提高了 89% 和 43%。改进的熔体粘弹性和机械性能的结合将进一步拓宽生物可降解聚合物的实际应用。 © 2024 工业化学学会。