Abstract

In this study cassava starch modified by ozone technology and cellulose nanofibres were used to produce films. These nanocomposites were produced by casting technique using non-modified and ozonated cassava starches, glycerol and, water reinforced with cellulose nanofibres (NCF) at 1%, 2%, and 5%. Films were characterized in terms of mechanical, barrier and functional properties, morphology, opacity and the sealing ability. In general, ozonated cassava films result in increased mechanical properties, water vapour permeability, and hydrophilicity. The addition of cellulose nanofibres, in certain conditions, improved these properties due to the NCF dispersion in the polymeric matrix. However, the formation of agglomerates in higher concentrations (2% and 5%) was visible by SEM images. In specific, the addition of 1% of NCF to the 60 min ozonated film increased the Tensile Strength and the Young Modulus in ~ 117% and ~ 137%, respectively, and decreased the water vapour permeability in ~ 47%, in comparison to the non-modified film without NCF. In conclusion, the addition of NCF to ozonated cassava films improved their properties aiming specific application showing to be an interesting alternative for packaging industries in different areas.

Graphic Abstract

中文翻译：

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具有纤维素纳米纤维的新型臭氧木薯薄膜：机械性能，阻隔性能和功能性能的生产和表征

摘要

在这项研究中，采用臭氧技术和纤维素纳米纤维改性的木薯淀粉被用于生产薄膜。这些纳米复合材料是通过铸造生产的使用未改性和臭氧化的木薯淀粉，甘油和1％，2％和5％的纤维素纳米纤维（NCF）增强水的技术。通过机械，阻隔和功能特性，形态，不透明性和密封能力来表征薄膜。通常，臭氧化木薯薄膜可提高机械性能，水蒸气渗透性和亲水性。由于在聚合物基质中的NCF分散，在某些条件下添加纤维素纳米纤维可改善这些性能。然而，通过SEM图像可见较高浓度（2％和5％）的附聚物的形成。具体而言，在60分钟的臭氧化膜中添加1％的NCF，分别将拉伸强度和杨氏模量分别提高约117％和约137％，并将水蒸气渗透率降低约47％，与没有NCF的非改性膜相比。总之，在臭氧化木薯薄膜中添加NCF可以改善其性能，从而针对特定的应用场合显示出它是不同领域包装行业的一个有趣替代品。

图形摘要