PVA–Banana pseudostem fiber lignocellulosic composite films were prepared by solution casting method and reinforced with increasing amount of nanocellulose filler for enhancement of mechanical and barrier properties. The nanocellulose filler was derived from microcrystalline cellulose via a green synthesis route avoiding use of concentrated acid in conventional process.

Composite films showed remarkable improvement in mechanical properties like tensile strength and elongation at break. Water barrier properties were also improved as evident by the reduction in swelling percentage and water vapour permeability. Film transparency was somewhat reduced due to the cross linking formed by the nanocellulose particles.

Overall a maximum improvement of 14.3% was observed in tensile strength of films reinforced with 3 wt% nanocellulose while the elongation at break reduced by 9.1% percent for the same. Water vapour permeability improved by 29.7%, the decrease being inversely proportional to amount of nanocellulose added. Water swelling test showed promising results as weight gain by the film was limited to only 16.8% after immersion in water for 24 h as compared to 67.4% weight gain by the PVA–lignocellulosic composite films containing no nanocellulose.

Our results show that nanocellulose addition to PVA–banana pseudostem fiber composite films significantly improve their mechanical and water barrier properties making them a suitable alternative to plastic packaging films.

PVA-香蕉假茎纤维木质纤维素复合膜是通过溶液流延法制备的，并通过增加纳米纤维素填料的量来增强其力学性能和阻隔性能。纳米纤维素填充剂通过绿色合成途径从微晶纤维素衍生而来，避免了在常规方法中使用浓酸。

复合膜在机械性能（例如拉伸强度和断裂伸长率）方面显示出显着改善。溶胀率和水蒸气渗透率的降低也明显改善了阻水性能。由于纳米纤维素颗粒形成的交联，膜的透明度有所降低。

总体上，观察到用3 wt％纳米纤维素增强的薄膜的拉伸强度最大提高了14.3％，而断裂伸长率降低了9.1％。水蒸气渗透性提高了29.7％，该降低与所添加的纳米纤维素的量成反比。水溶胀试验显示出令人鼓舞的结果，因为薄膜在水中浸泡24小时后的增重仅被限制为16.8％，而不含纳米纤维素的PVA-木质纤维素复合薄膜的增重为67.4％。

我们的结果表明，将纳米纤维素添加到PVA-香蕉假茎纤维复合膜中可以显着改善其机械和防水性能，使其成为塑料包装膜的合适替代品。