纯纤维素纳米纤维膜能否取代聚烯作为包装中的水蒸气屏障?
Hans Estrella Cainglet1, Jay R Black2, Hashini Udugoda1
1Bioresource Processing Research Institute of Australia, Department of Chemical and Biological Engineering, Monash University, Clayton, VIC 3800, Australia.
Journal of colloid and interface science
|September 21, 2024
概括
纤维素纳米纤维 (CNF) 薄膜具有较差的水蒸气屏障特性,限制了它们作为塑料替代品的使用. 即使是高克度的CNF薄膜也不能完全消除湿度传递,因此需要对包装应用进行进一步的修改.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 聚合物科学 聚合物科学
背景情况:
- 纤维素纳米纤维 (CNF) 薄膜被探索为合成塑料的可持续替代品.
- 薄膜的不良水蒸气屏障性能阻碍了它们的商业应用,特别是食品包装.
- 在纳米纤维组装材料中实现充分的防潮屏障性能仍然是一个开放的问题.
研究的目的:
- 为了全面了解CNF薄膜结构和水蒸气传输特性之间的关系.
- 为了确定高重量的CNF薄膜能否达到与聚烯相美的防潮性能.
- 为了确定纯CNF薄膜在包装应用中的局限性.
主要方法:
- 通过造和喷雾沉积,生产超过200种不同重量 (30580 g/m2) 的CNF薄膜.
- 使用微型计算机断层扫描 (μCT) 和扫描电子显微镜 (SEM) 量化膜结构.
- 测量水蒸气传递速率 (WVTRs) 以评估屏障特性.
主要成果:
- 增加薄膜重量导致毛孔性和毛孔连接性下降.
- 随着电影的重量增加,WVTR 呈指数级下降.
- 观察到WVTR高原在30g/m2/day左右,这表明水分传输机制的消除不完全.
结论:
- 纯CNF薄膜,即使在高克度,也没有足够的水蒸气屏障特性来取代包装中的聚烯.
- 开放空间和吸附-扩散机制限制了CNF膜的屏障性能.
- 修改,如涂层或纳米填充剂的结合是必要的,以提高CNF薄膜的防潮屏障能力.
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