Synthesis of composite films using polymer blends of chitosan and cellulose nanocrystals from marine origin

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Mechanical and Materials Engineering Pub Date : 2024-07-08 DOI:10.1186/s40712-024-00145-z

Rahul Varma, Sugumar Vasudevan

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Abstract

Thin films reinforced with chitosan and cellulose nanocrystals (CNC) were produced using the casting process. In this study, the impact of plasticisers and sizing agents such as glycerol and polyvinyl alcohol (PVA) respectively on morphological, structural, thermal, and mechanical properties was investigated. The results showed the blends of CNC/PVA/glycerol gave better results when compared to films produced by blends of chitosan/PVA/glycerol films and chitosan/CNC/PVA/glycerol films. The UV spectroscopy showed 65% transmittance for chitosan/PVA/glycerol films, while the film of CNC/PVA/glycerol showed transmittance of 40%. The transmittance of chitosan/CNC/PVA/glycerol showed 75%. The films formed by the combination of CNC/PVA/glycerol showed better stress/strain properties than other films. The films of all combinations showed good thermal stability between the range of 350 and 450 °C. The morphological study using SEM revealed smooth texture for all the films. The study suggests that the films produced may be used for the food packaging applications due to its thermal stability and stress/strain properties.

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利用壳聚糖和海洋来源纤维素纳米晶体的聚合物混合物合成复合薄膜

采用浇铸工艺生产了壳聚糖和纤维素纳米晶体（CNC）增强薄膜。在这项研究中，研究了增塑剂和施胶剂（如甘油和聚乙烯醇（PVA））分别对形态、结构、热和机械性能的影响。结果表明，与壳聚糖/PVA/甘油薄膜和壳聚糖/CNC/PVA/甘油薄膜的混合物相比，CNC/PVA/甘油的混合物能产生更好的薄膜。紫外光谱显示，壳聚糖/PVA/甘油薄膜的透射率为 65%，而 CNC/PVA/ 甘油薄膜的透射率为 40%。壳聚糖/CNC/PVA/甘油的透射率为 75%。与其他薄膜相比，CNC/PVA/甘油组合形成的薄膜具有更好的应力/应变特性。所有组合的薄膜在 350 至 450 °C 范围内均表现出良好的热稳定性。使用 SEM 进行的形态研究显示，所有薄膜的纹理都很光滑。研究表明，由于其热稳定性和应力/应变特性，所生产的薄膜可用于食品包装应用。

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