To improve the mechanical properties of biodegradable bioplastic poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), a filler made up of silica particles (SiO₂) is mixed with PHBH; however, SiO₂ shows low compatibility with PHBH. Herein, to enhance the interfacial adhesion of SiO₂ and PHBH, the PHBH-grafted SiO₂ (SiO₂–PHBH) fillers were prepared from propargyl-terminated PHBH and azide-modified SiO₂ by click chemistry. Scanning electron microscopy revealed that SiO₂–PHBH fillers dispersed uniformly in PHBH. In contrast, the SiO₂ fillers aggregated in PHBH. Thermal analysis of the PHBH/SiO₂–PHBH composite films revealed that the glass transition temperature shifted to a high temperature. Young’s modulus and yield stress of the PHBH/SiO₂–PHBH composite films were increased with increasing concentration of SiO₂–PHBH. Conversely, PHBH/SiO₂ composite films showed only a small increase in the elastic modulus and a decrease in the yield stress. These results confirmed that SiO₂–PHBH improves the mechanical properties of PHBH, and it is expected to expand the industrial applications of PHBH.

中文翻译：

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聚（3-羟基丁酸酯之间界面粘结的改进共-3-羟基己酸酯）和二氧化硅颗粒

为了提高可生物降解的生物塑料的聚（3-羟基丁酸酯的机械性能共-3-羟基己酸酯）（PHBH），填充剂制成的二氧化硅颗粒（二氧化硅高达₂）与PHBH混合; 但是，SiO ₂与PHBH的相容性低。在此，为了增强SiO ₂和PHBH的界面粘合性，通过点击化学方法，由炔丙基封端的PHBH和叠氮化物改性的SiO ₂制备了PHBH接枝的SiO ₂（SiO ₂ -PHBH）填料。扫描电子显微镜显示，SiO ₂ -PHBH填料均匀地分散在PHBH中。相反，SiO ₂填料聚集在PHBH中。PHBH / SiO _2的热分析–PHBH复合膜表明玻璃化转变温度转变为高温。的PHBH /二氧化硅的杨氏模量和屈服应力_2层-PHBH复合膜的SiO浓度的增加分别增加₂ -PHBH。相反，PHBH / SiO ₂复合膜仅显示出很小的弹性模量增加和屈服应力的减少。这些结果证实了SiO ₂ -PHBH改善了PHBH的机械性能，并且有望扩大PHBH的工业应用。