Abstract Sustainable nanocomposites with transparent, biodegradable, and enhanced mechanical and barrier properties were prepared by the incorporation of SiO2 into poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) films and subsequent solvent casting. The crystallinity of composites could be increased by 67% with appropriate contents of SiO2, which proved that SiO2 were effective nucleating agents for PHBH. And it was worth mentioning that the contributions of SiO2 to the crystallization and thermal stability of composites are proved effectively by Avrami relationship and Horowitz and Metzger method. More importantly, compared with PHBH, it had not only an enhancement about 40% and 60% on the tensile strength and elastic modulus, respectively, but also half the reduction of the moisture and oxygen permeability which were much higher than the values of conventional plastics. The above, in conjunction with the low migration rate measured in food substitutes, illustrated unambiguously that the nanocomposites might be suitable for potential application in food packaging. Graphical abstract SiO2/PHBH nanocomposites with fine crystallization and improved mechanical and barrier properties.

中文翻译：

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用于食品包装的基于 SiO2 和可生物降解的聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBH）的可持续纳米复合薄膜

摘要 通过将 SiO2 掺入聚（3-羟基丁酸-共-3-羟基己酸酯）（PHBH）薄膜中并随后进行溶剂浇铸，制备了具有透明、可生物降解、增强的机械和阻隔性能的可持续纳米复合材料。SiO2 含量适当时，复合材料的结晶度可提高 67%，证明 SiO2 是 PHBH 的有效成核剂。值得一提的是，Avrami 关系和 Horowitz 和 Metzger 方法有效地证明了 SiO2 对复合材料结晶和热稳定性的贡献。更重要的是，与PHBH相比，它不仅拉伸强度和弹性模量分别提高了40%和60%左右，而且水分和氧气的渗透率也降低了一半，这远高于传统塑料的值。以上，结合在食品替代品中测得的低迁移率，明确说明纳米复合材料可能适用于食品包装中的潜在应用。具有精细结晶和改进的机械和阻隔性能的图形抽象 SiO2/PHBH 纳米复合材料。