聚合物架构对聚合物 (甲基甲酸) - - 纳米复合物融中的复合学和细分动态的影响
Saeid Darvishi1, Erkan Şenses1,2,3
1Department of Chemical and Biological Engineering, Koç University, İstanbul, Turkiye.
Turkish journal of chemistry
|January 4, 2024
概括
聚合物架构显著影响了质学和动力学. 纳米粒子进一步减缓了聚合物动态,为膜等先进材料提供了可调节的特性.
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
- 风病学和介电光谱学 介电光谱学
背景情况:
- 聚合物链架构决定了质行为和内部动力学.
- 了解这些关系是设计具有可调节机械性能的先进热塑性纳米复合材料的关键.
研究的目的:
- 研究线性聚合物,瓶刷和星型聚甲酸 (PMMA) 聚合物之间的气质和动态差异.
- 检查二氧化纳米粒子添加对这些不同的PMMA架构的行为的影响.
- 为材料设计,将聚合物结构与宏观性质相关联.
主要方法:
- 风病学和时间-温度叠加 (TTS) 来分析动态模块和放松模式.
- 宽带介电光谱 (BDS) 用于在广泛的频率范围内探测细分动力学.
- 调查整洁的聚合物及其纳米复合物与分散的纳米粒子.
主要成果:
- 线性PMMA展示了一个纠的网络,而分支架构 (瓶,星) 显示没有纠高原和明显的手臂放松.
- 由于动态异质性,分支聚合物表现出更高的脆弱性指数.
- 纳米粒子添加主要影响终端放松,阻碍整个链的运动.
- 分段放松在恒星同聚合物和纳米复合材料的所有架构中显著放缓,在较低的温度下明显的温度依赖放缓.
结论:
- 聚合物架构从根本上改变了粘弹性反应和动态.
- 纳米粒子影响链条动态,特别是在接口,导致显著的减速.
- 结果为开发具有定制机械和动态性能的材料提供了洞察力,用于气体分离和膜的应用.
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