A biocomposite of poly (3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) (PHBH)/nano‐SiO₂ modified with silane coupling agent KH570 (KH570‐SiO₂/PHBH) were prepared by solution‐casting method. SiO₂ modified with KH570 exhibited improved uniform dispersion than that of pure nano‐SiO₂, and maximum thermal decomposition temperature range and crystallinity (X_c) of KH570‐SiO₂/PHBH are 8.6°C and 119.7% higher than that of neat PHBH. Compared to the neat PHBH, a 75.4% and 70.8% improvement in Young's modulus and tensile strength were obtained. The water‐vapor transmission and oxygen permeance of KH570‐SiO₂/PHBH decreased by 46.2% and 618.6%, respectively. The oxygen barrier property is equivalent to that of polyvinylidene chloride. Simultaneous enhancements on the thermal stability, mechanical, crystallizing, and barrier properties were mainly caused by uniform dispersion of modified nano‐SiO₂ and solid interfacial bonding between filler and matrix.

中文翻译：

---

改善聚（3-羟基丁酸酯-co-3-羟基己酸酯）/改性纳米SiO2的生物复合材料的热，机械和阻隔性能

通过溶液浇铸法制备了由硅烷偶联剂KH570（KH570-SiO ₂ / PHBH）改性的聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBH）/纳米SiO ₂的生物复合材料。用KH570改性的SiO ₂表现出比纯纳米SiO ₂更好的均匀分散性，并且KH570-SiO ₂ / PHBH的最大热分解温度范围和结晶度（X _c）比纯PHBH高8.6°C和119.7％。 。与纯PHBH相比，杨氏模量和拉伸强度分别提高了75.4％和70.8％。KH570‐SiO ₂的水蒸气透过率和透氧性/ PHBH分别下降了46.2％和618.6％。氧阻隔性与聚偏二氯乙烯相当。热稳定性，机械性能，结晶性能和阻隔性能的同时提高主要是由于改性纳米SiO ₂的均匀分散以及填料与基体之间的固体界面结合所致。