开发一种由生物聚合物和纤维素微纤维组成的新型三明治结构复合材料,用于建筑外应用
Masoud Dadras Chomachayi1, Pierre Blanchet2, Atif Hussain3
1Department of Wood and Forest Sciences, Laval University, Quebec City, QC, G1V 0A6, Canada. masoud.dadras-chomachayi.1@ulaval.ca.
Scientific reports
|December 11, 2023
概括
化学修饰的纤维素微纤维 (CMF) 增强了聚酸酸 (PHA) /聚乳酸 (PLA) 复合物. 修改后的CMF提高了热稳定性,机械强度和屏障性能,在老化后显示出优越的耐用性.
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
- 生物复合材料是一种生物复合材料.
背景情况:
- 聚氨酸 (PHA) 和聚乳酸 (PLA) 是可生物降解的聚合物,在可持续材料中具有潜在的应用.
- 纤维素微纤维 (CMF) 是天然的增强剂,可以改善聚合物特性,但通常与聚合物矩阵的兼容性不佳.
- 化学修改CMF是必要的,以提高它们在聚合物复合材料中的分散和界面粘附.
研究的目的:
- 开发一种使用PHA和PLA/CMF的新型三明治结构复合材料.
- 使用sol-gel工艺化学修改CMF,以提高它们与PLA矩阵的兼容性.
- 评估改性CMF对开发的复合材料的热,机械,屏障和耐久性质的影响.
主要方法:
- 用PHA表面层和PLA/CMF中间层制造一个三明治结构的复合材料.
- 通过sol-gel工艺对CMF进行化学修饰,以赋予水性.
- 使用接触角测量对修改后的CMF分散的描述.
- 使用热重力测量分析 (TGA) 评估热稳定性.
- 评估机械性能,包括拉伸模量和强度.
- 测量水蒸气透率 (WVP) 以评估屏障性能.
- 加速老化试验,以确定复合材料的耐用性.
主要成果:
- 修改后的CMF表现出增强的疏水性 (接触角度~118°) 和在PLA矩阵中的均分散.
- 与未经处理的CMF相比,使用修改CMF的三明治复合材料显示出更好的热稳定性.
- 复合材料的拉伸模量和强度随着CMF的加入而显著增加.
- 与未经处理的CMF相比,使用修改CMF的复合材料表现出优越的水蒸气屏障性能.
- 加速老化导致未经处理的CMF复合材料的机械和屏障性能下降,而那些经过修改的CMF的复合材料显示出最小的降解.
结论:
- 通过sol-gel加工对CMF进行化学修饰,有效地提高了它们在PLA中的兼容性和分散性.
- 开发的PHA/PLA/修改的CMF三明治复合材料表现出增强的热稳定性,机械强度和屏障性能.
- 修改后的CMF显著提高了生物复合材料的耐用性和耐老性.
- 这项研究提出了一种有希望的方法,用于使用天然纤维创建高性能,可持续的生物复合材料.
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