水性纤维素溶剂衍生的纤维素纳米晶体结构的变化和增强效应
Yuqi Tong1,2, Shuting Huang1, Xianjun Meng2
1Department of Food Science and Agricultural Chemistry, McGill University, Ste Anne de Bellevue, QC H9X 3V9, Canada.
Polymers
|July 29, 2023
概括
研究人员使用不同的溶剂修改了纤维素纳米晶体,创造了针状和棒状结构. 这些改造的纤维素纳米晶体显示出增强材料性能 (如强度和屏障性能) 的潜力.
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:
- 纤维素纳米晶 (CNC) 是有前途的增强剂,但其尺寸取决于来源.
- 调节CNC形态是优化其增强能力的关键.
研究的目的:
- 用不同的纤维素溶剂手动改变纤维素纳米晶体 (CNC) 形态.
- 研究各种形态的CNC的增强效应.
主要方法:
- 废弃的棉织物被硫酸和NaOH/尿素水溶液处理.
- 再生纤维素被水解以产生CNC (RCNC-H和RCNC-N).
- 在聚乙烯醇 (PVA) 薄膜中加入了CNC,以评估增强效应.
主要成果:
- 硫酸处理产生了针状RCNC-H (面积比~15.2),具有混合晶体结构.
- NaOH/尿素处理溶解棉花,产生棒状RCNC-N (面积比约6.3),具有纤维素II结构和更高的结晶度.
- PVA/RCNC-H薄膜显示出更好的抗拉强度和氧气屏障.
- 在PVA/RCNC-N薄膜中,水蒸气的透性较低.
结论:
- 本研究介绍了一种使用溶剂处理量身定制CNC纳米结构的方法.
- 经过修改的CNC为各种材料应用提供了可调节的性能.
- 改变CNC形态为先进的材料设计提供了一个新的途径.
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