全纤维素纳米复合材料的水和氧屏障特性
Chris Rader1, Luca Grillo1, Christoph Weder1
1Adolphe Merkle Institute, Polymer Chemistry and Materials, University of Fribourg, Chemin des Verdiers 4, Fribourg 1700, Switzerland.
Biomacromolecules
|February 23, 2024
概括
基纤维素 (HPC) 纳米复合材料与纤维素纳米晶体 (CNC) 显示出改善的机械性能和降低食品包装的透性. 这些生物基材料提供了增强的刚性和强度,同时保持透明度和可观的可伸缩性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 纳米技术纳米技术
背景情况:
- 基基纤维素 (HPC) 是一种生物基材料,有可能用于食品包装.
- 然而,它的低刚性,强度和高透性限制了它的应用.
- 纤维素纳米晶体 (CNCs) 提供高刚性,强度和低透性.
研究的目的:
- 为了提高HPC在食品包装应用中的性能.
- 研究将纤维素纳米晶体 (CNC) 纳入HPC矩阵的效果.
- 开发透明的,生物基纳米复合材料薄膜,具有改进的机械和屏障性能.
主要方法:
- 通过离子交换来制备乙醇可分散的纤维素纳米晶体 (CTA.CNC).
- 化纤维素 (HPC) /CTA.CNC纳米复合材料薄膜的溶剂造.
- 机械性能 (模,抗拉强度,伸展性) 和传输速率 (水蒸气,氧气透性) 的表征.
主要成果:
- 与整洁的HPC.CNC相比,HPC/CTA.CNC纳米复合材料显著增加了Young的模量 (高达20倍) 和拉伸强度 (翻了一番以上).
- 高达90%重量CTA的片.CNC仍然具有高度的透明度.
- 复合材料的水蒸气透率降低了≤70重量%CTA.CNC,氧气透率降低了一个数量级.
- 复合材料在75%的相对湿度下保持机械完整性,但在水中分解.
结论:
- HPC/CTA.CNC纳米复合材料代表了食品包装材料的有希望的基于生物的替代品.
- 纳入CNC有效地提高了HPC的机械强度和屏障性能.
- 可能需要进一步的研究来改善更广泛的应用的抗水性.
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