Hygrothermal aging of neat poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) and PHBV filled with an organomodified montmorillonite (C30B) at 3wt. was investigated at 65°C and 100% relative humidity (RH) up to 100 days. FT‐IR data indicated that the carbonyl intensity index decreased with exposure time for both samples, while the main degradation mechanism occurred through hydrolysis reaction. This led to chain scissions resulting in a decrease in molar mass. Water absorption increased with exposure time for both neat PHBV and PHBV/C30B (3wt%) bionanocomposite. Differential scanning calorimetry measurements showed a decrease in both crystallinity index and melting temperature after hygrothermal aging and thermogravimetric analysis data indicated also a decrease in thermal stability. Mechanical and viscoelastic properties were also altered, being, however, more pronounced for the neat PHBV. Overall, the PHBV bionanocomposite exhibited a better resistance toward hygrothermal aging at 65°C and 100% RH.

中文翻译：

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湿热老化对聚（3-羟基丁酸酯-co-3-羟基戊酸酯）/氯硅酸盐30B纳米复合材料化学，物理和机械性能的影响

净聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）和PHBV的湿热老化过程，其中PHBV填充了3wt％的有机改性蒙脱土（C30B）。在65°C和100％相对湿度（RH）长达100天的条件下进行了研究。FT-IR数据表明，两种样品的羰基强度指数均随着暴露时间的延长而降低，而主要的降解机理是通过水解反应发生的。这导致链断裂，导致摩尔质量降低。纯净的PHBV和PHBV / C30B（3wt％）的仿生纳米复合材料的吸水率随着暴露时间的增加而增加。差示扫描量热法测量显示在湿热老化后结晶度指数和熔融温度均降低，并且热重分析数据表明热稳定性也降低。机械和粘弹性也发生了变化，但是，对于纯净的PHBV来说更为明显。总体而言，PHBV纳米复合材料对65°C和100％RH的湿热老化表现出更好的抵抗力。