带有金属协调键的环氧网的机械性能:从温度和摩尔质量变化的洞察
Benke Li1, Stelios Alexandris1, Christos Pantazidis2
1Institute of Electronic Structure and Laser, FORTH, Heraklion, 70013, Greece.
Macromolecules
|October 14, 2024
概括
具有牺牲性铁-甲基酸盐键的双网络 (DN) 具有可调节的机械性能,显示出增强的刚性和可伸缩性. 温度和聚乙烯糖醇 (PEG) 摩尔质量显著影响网络行为,为先进材料提供设计指南.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 材料机械学 材料机械学
背景情况:
- 聚乙烯甘醇 (PEG) 网络正在研究其热和机械性能.
- 双网络 (DN) 结合了共价环氧和动态铁酸盐键,提供了强度和可变形性的独特组合.
- 温度和PEG前体的摩尔质量对DN力学的影响在很大程度上仍未被探索.
研究的目的:
- 研究温度和PEG前体分子质量对单个网络 (SN) 和双网络 (DN) 的机械性能的影响.
- 了解在机械应力下DNs中的债券动态和恢复机制.
主要方法:
- 使用聚乙烯糖醇 (PEG) 合成SNs和DNs,其摩尔质量为500g/mol和1000g/mol.
- 热和机械性能的表征,包括剪切和延长试验.
- 对温度变化和非线性变形的网络反应的分析.
主要成果:
- 随着PEG质量的增加,SN会变软.
- 在加热时,DN显示可逆的软化,而SN则受到最小的影响.
- 在DNs中的非线性剪切变形会破坏铁-甲基酸盐键,导致由于三复合体形成而恢复时显著增加模量.
- 与SN和其他网络相比,具有牺牲债券的DN表现出优越的刚性和可扩展性.
结论:
- 基于PEG的网络的机械性质可以通过改变PEG分子质量和结合动态键来显著调整.
- 带有铁-甲基酸盐键的双网络为创建具有自我愈合和增强机械性能的材料提供了一个有希望的平台.
- 研究结果为设计先进的双重网络提供了有价值的见解,这些网络具有在分子水平上量身定制的机械反应.
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