Reversible Thermal Stiffening in Polymer Nanocomposites.
Reversible Thermal Stiffening in Polymer Nanocomposites.
复制标题
聚合物纳米复合材料中的可逆热硬化。
DOI：
10.1021/acsami.5b02046
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发表时间：
2015
影响因子：
9.5
通讯作者：
Pinar Akcora
中科院分区：
文献类型：
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作者：
Erkan Şenses;A. Isherwood;Pinar Akcora
已知具有不同玻璃化转变温度（Tg）的混相聚合物混合物会在玻璃化链和移动链之间产生受限界面。在这里，我们展示了纳米颗粒被高Tg聚合物（聚甲基丙烯酸甲酯）吸附，并分散在低Tg基质聚合物（聚环氧乙烷）中，在两种聚合物的Tg以上温度下表现出液固转变。纳米复合材料对温度的力学适应性是纳米颗粒表面动态不对称束缚层存在的基础，更重要的是它对复合材料宏观力学响应的影响。不寻常的可逆硬化行为使这些材料有别于传统的聚合物复合材料，加热后会变软。所提出的聚合物纳米复合材料的强化机制可用于柔性电子或机械诱导致动器，以响应温度或磁场等环境变化。
Miscible polymer blends with different glass transition temperatures (Tg) are known to create confined interphases between glassy and mobile chains. Here, we show that nanoparticles adsorbed with a high-Tg polymer, poly(methyl methacrylate), and dispersed in a low-Tg matrix polymer, poly(ethylene oxide), exhibit a liquid-to-solid transition at temperatures above Tg's of both polymers. The mechanical adaptivity of nanocomposites to temperature underlies the existence of dynamically asymmetric bound layers on nanoparticles and more importantly reveals their impact on macroscopic mechanical response of composites. The unusual reversible stiffening behavior sets these materials apart from conventional polymer composites that soften upon heating. The presented stiffening mechanism in polymer nanocomposites can be used in applications for flexible electronics or mechanically induced actuators responding to environmental changes like temperature or magnetic fields.
影响因子：
21.8
作者：
通讯作者：
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