硬化不混合聚合物混合物:通过纳米尺度可视化探索界面结晶诱导兼容性的作用
Hamid Ahmadi1, Paul M H van Heugten1, Alexander Veber2,3
1Processing and Performance of Materials, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands.
ACS applied materials & interfaces
|October 16, 2024
概括
通过立体复合的界面结晶诱导相容 (ICIC) 显著提高了聚合物混合强度. 这种新的方法提高了界面粘附性,从而产生更坚固的材料,具有更高的抗破裂性和刚性晶体层.
科学领域:
- 聚合物科学与工程 聚合物科学与工程
- 材料科学 材料科学 材料科学
- 结晶的现象 结晶的现象
背景情况:
- 热力学不混合的聚合物往往表现出较差的界面粘附性,限制了它们的机械性能.
- 开发有效的兼容策略对于创建高性能聚合物混合物至关重要.
- 立体复杂化为增强聚合物相互作用提供了一个独特的途径.
研究的目的:
- 为了探索界面结晶诱导的兼容性 (ICIC),使用对不混合的聚合物混合物的立体复合.
- 合成和描述新型的反应性界面兼容剂.
- 评估ICIC对PVDF/PLLA混合物的界面强度,形态和机械性能的影响.
主要方法:
- 通过反应性融混合,合成反应性兼容剂:聚 styrene-co-glycidyl methacrylate-graft-poly-l-lactic acid (SAL) 和聚 styrene-co-glycidyl methacrylate-graft-poly-d-lactic acid (SAD) 的合成方法.
- 准备不混合的聚乙烯化物/聚1乳酸 (PVDF/PLLA) 混合物.
- 使用IR纳米成像,小振幅振荡剪切 (SAOS),动态机械热分析 (DMTA),原子力显微镜 (AFM),IR纳米光谱,扫描电子显微镜 (SEM) 和单边曲 (SENB) 测试进行表征.
主要成果:
- ICIC通过立体复合成功增强了PVDF/PLLA混合物的界面强度.
- 观察到形成一个200-300纳米厚的刚性立体复合体 (SC) 晶体界面层.
- 在机械性能方面取得了显著的改进,包括破裂时延伸度增加了20倍以上,断裂度增加了两倍.
结论:
- ICIC是改善不混合聚合物混合物的界面强度和机械性能的一个有希望的策略.
- 在接口上形成一个刚性SC晶体层是增强性质的关键.
- 这种方法为创造更坚固,更坚固的聚合物材料提供了途径.
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