The mechanical, thermal and barrier properties of a sustainable PHBV/PBAT blend was investigated under the influence of organically modified nanoclay (0.6, 1.2 and 1.8 wt%) after processing by two different techniques i.e. compression moulding and cast film extrusion. Firstly, a pelletized nanoclay masterbatch was fabricated by blending PBAT with 20% nanoclay using melt extrusion. The masterbatch was used as a reinforcement phase for the PHBV/PBAT blend matrix to fabricate nanocomposite pellets using a melt extrusion process. The prepared PHBV/PBAT/Nanoclay nanocomposite pellets were used to fabricate films using compression moulding and cast film extrusion. The cast extruded PHBV/PBAT nanocomposite films showed improved barrier properties (oxygen and water vapour) as compared to compression moulded films because of the chain orientation during the high-speed stretching. The barrier properties results showed significant improvement of ~79 and ~70% in oxygen and water vapour permeability respectively in cast PHBV/PBAT composite films after adding 1.2 wt% nanoclay, which indicates a good dispersion of nanoclay and strong interfacial adhesion between the matrix and filler. The intercalation/exfoliation of nanoclay in PHBV, as well as at the interface of the PHBV and PBAT blend matrix, was confirmed by transmission electron microscopy (TEM). The % elongation at break (567.6 ± 0.1) of the cast PHBV/PBAT/Nanoclay(1.2%) nanocomposite film was highly improved as compared to that of the PHBV/PBAT blend due to better stress transfer ability as compared to the compression moulded film. The rheological properties also support better dispersion of nanoclay and interaction between the matrix and filler. Hence, the cast extruded nanocomposite film with 1.2% nanoclay is a potential candidate to be used in flexible packaging.

在有机改性的纳米粘土（0.6、1.2和1.8 wt％）的影响下，通过两种不同的技术（即压缩成型和流延薄膜挤出）加工后，研究了可持续的PHBV / PBAT共混物的机械，热和阻隔性能。首先，通过使用熔融挤出将PBAT与20％纳米粘土共混来制备粒状纳米粘土母料。该母料用作PHBV / PBAT共混物基质的增强相，以使用熔融挤出工艺制造纳米复合材料粒料。制备的PHBV / PBAT / Nanoclay纳米复合材料小球用于通过压缩成型和流延薄膜挤出来制备薄膜。与压铸膜相比，流延挤出的PHBV / PBAT纳米复合膜表现出更好的阻隔性能（氧气和水蒸气），这是因为高速拉伸过程中的链取向。阻隔性能结果表明，加入1.2 wt％的纳米粘土后，浇铸的PHBV / PBAT复合薄膜的氧气和水蒸气渗透率分别显着提高〜79％和〜70％，这表明纳米粘土具有良好的分散性，并且基体与基体之间的界面附着力强。填料。通过透射电子显微镜（TEM）证实了纳米粘土在PHBV中以及在PHBV和PBAT共混物基质的界面中的嵌入/剥离。铸造PHBV / PBAT /纳米粘土的断裂伸长率（567.6±0.1）（1。与PHBV / PBAT共混物相比，2％）纳米复合膜由于与压塑膜相比更好的应力传递能力而得到了极大的改善。流变性质还支持纳米粘土更好的分散以及基质与填料之间的相互作用。因此，具有1.2％纳米粘土的流延挤出纳米复合材料膜是用于软包装的潜在候选者。