增强PLA结晶,透明度和强度,通过添加CNC接种的长形链
Huizi Shi1, Xiulong Jiang1, Gui Liu2
1Shanghai Key Laboratory of Lightweight Composite, Innovation Center for Textile Science and Technology, College of Materials Science and Engineering, College of Textiles, Donghua University, Shanghai 201620, People's Republic of China.
International journal of biological macromolecules
|May 22, 2024
概括
将长链植入纤维素纳米晶体 (CNC) 上,改进了聚乳酸 (PLA) 薄膜. 这增强了结晶,透明度和强度,克服了PLA应用的关键挑战.
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:
- 聚乳酸 (PLA) 薄膜在平衡结晶,透明度和强度方面面临着挑战,限制了它们的应用.
- 纤维素纳米晶 (CNCs) 具有作为强化剂的潜力,但需要对表面进行修改以获得更好的兼容性.
研究的目的:
- 开发一种将八甲基胺 (ODA) 植入CNC的方法,以创建修改后的纳米增强剂 (g-CNC).
- 研究g-CNCs对PLA纳米复合材料薄膜性能的影响,重点研究结晶,透明度,强度和耐热性.
主要方法:
- 使用酸氧化自聚合和迈克尔添加/Schiff基反应,对有ODA的CNC表面进行修改.
- 通过造方法制备PLA/g-CNC纳米复合材料薄膜.
- 使用差分扫描热度计 (DSC),广角X射线衍射 (WAXD),极化光学显微镜 (POM),紫外线光谱学和拉伸测试来描述薄膜特性.
主要成果:
- g-CNCs显著提高了PLA的融化结晶率 (从11分钟到7.3分钟).
- 由于g-CNC分散而减少的PLA球状体尺寸导致透明度提高 (80.6%),同时达到高结晶 (62%).
- 拉力强度从44.31 MPa增加到65.05 MPa,热变形性能得到改善.
结论:
- 由ODA移植的CNC可以作为PLA的有效绿色增援.
- 修改后的CNC同时提高了PLA膜的结晶,透明度和机械强度.
- 这种方法为开发基于PLA的高性能材料提供了一个有前途的战略.
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