Multireusable Thermoset with Anomalous Flame-Triggered Shape Memory Effect
Multireusable Thermoset with Anomalous Flame-Triggered Shape Memory Effect
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DOI：
10.1021/acsami.9b03092
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发表时间：
2019-05-01
影响因子：
9.5
通讯作者：
Li, Guoqiang
中科院分区：
文献类型：
--
作者：
Feng, Xiaming;Fan, Jizhou;Li, Guoqiang
虽然近年来已经开发了具有高机械性能和形状记忆能力的热固性材料，但其固有的不可重复使用性和易燃性仍然存在两个主要瓶颈，特别是对于那些用于回收要求的领域的形状记忆热固性材料，其具有高玻璃化转变温度（T-g），因此具有引发形状恢复的危险高温。在这里，我们报告了一种新的形状记忆环氧热固性树脂，具有优异的阻燃性，可回收性，高机械性能，和100%的形状恢复率。首次采用高温火焰直接触发的方法实现了这种新型热固材料的形状记忆效应。此外，幸存的热固性材料可以通过简单的固态回收方法回收，并重新用作聚酯的增强填料。最高的回收效率达到85.4%，增强复合材料表现出约4倍的高储能模量相比，净样品。这项工作可能会打开一扇大门，热固性形状记忆聚合物在许多轻质工程结构和设备的火灾危险是一个问题。新提出的火焰触发形状记忆效应的概念也可能在防火系统中找到应用。
While thermosets with high mechanical properties and shape memory capabilities have been developed in recent years, two main bottlenecks persist in their intrinsic nonreusability and flammability, especially for those shape memory thermosets used in recycling-required field with high glass transition temperatures (T-g) and thus risky high temperatures to trigger shape recovery. Here, we report a new shape memory epoxy thermoset integrated with excellent fire retardancy, recyclability, high mechanical performance, and 100% shape recovery ratio. The shape memory effect of this new thermoset was directly triggered by high-temperature flame for the first time. Furthermore, the survival thermoset can be recycled by a simple solid-state recycling method and reused as reinforcing fillers for polyester. The highest recycling efficiency reached 85.4%, and the reinforced composite presented about four times higher storage modulus compared to that of neat sample. This work may open a door for application of thermoset shape memory polymers in many lightweight engineering structures and devices where fire hazard is a concern. The newly proposed concept of flame-triggered shape memory effect may also find applications in fire-protecting system.