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微量索尔比特醇修饰的纳米二氧化:朝着纳米核化为聚 (L-乳酸) 的方向
1Department of Materials Science and Engineering, Beijing Technology and Business University, Beijing 100048, China.
International journal of biological macromolecules
|June 19, 2024
概括
这项研究引入了纳米二氧化与D-sorbitol (m-SiO2) 吸附,作为聚-L-乳酸 (PLLA) 的有效核化剂. 这种新型复合物显著增强了PLLA.
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) 结晶不良,需要有效的核化剂来改善其性能.
- 有机纳米填充剂往往无法在非同热结晶的PLA中增强核和结晶性.
- 开发高效的异质核化剂对于释放PLA的全部潜力至关重要.
研究的目的:
- 研究纳米二氧化与D-sorbitol (m-SiO2) 作为异质核化剂吸附在聚L-乳酸 (PLLA) 上的作用.
- 分析PLLA/m-SiO2复合材料的异热和非异热结晶行为和动力学.
- 评估m-SiO2对PLLA热和机械性能的影响.
主要方法:
- 融化混合的PLLA与不同度的m-SiO2.
- 使用传输电子显微镜 (TEM) 进行散的表征.
- 通过差分扫描热量计 (DSC) 和极化光学显微镜 (POM) 进行热分析,用于结晶研究.
- 使用Avrami模型和激活能计算的动力分析.
主要成果:
- TEM证实了m-SiO2在PLLA矩阵中以100-300nm集群的形式均分散.
- DSC和POM在非同热结晶的PLLA/m-SiO2.2中显著改善了核化速率和密度.
- PLLA/3%m-SiO2的结晶温度从97.2°C增加到108.2°C,结晶度从6.8%上升到48.6% (在10°C/分钟冷却下).
- 同热结晶显示Avrami指数没有变化,但结晶率急剧增加.
- 两种结晶过程都表现出增加的激活能量.
- 热曲温度从59°C增加到152°C,撞击强度增加了50%.
结论:
- 与D-醇 (m-SiO2) 吸附的纳米二氧化是PLLA的高效异质核化剂.
- m-SiO2显著提高了PLLA的结晶温度,结晶性和机械性能.
- 这种方法为改善基于PLA的材料用于更广泛的应用提供了一个有希望的策略.
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