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Nanocomposites of Poly(hydroxyurethane)s with Multiwalled Carbon Nanotubes: Synthesis, Shape Memory, and Reprocessing Properties
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-03-24 , DOI: 10.1021/acsapm.0c00183 Muhammad Adeel 1 , Bingjie Zhao 1 , Lei Li 1 , Sixun Zheng 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-03-24 , DOI: 10.1021/acsapm.0c00183 Muhammad Adeel 1 , Bingjie Zhao 1 , Lei Li 1 , Sixun Zheng 1
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Poly(hydroxyurethane)s (PHUs) are synthesized via non-isocyanate approaches and could be the potential alternatives of conventional polyurethanes. It is of importance to investigate the structure–property relationship of PHUs. In this work, we investigated the PHU nanocomposites containing multiwalled carbon nanotubes (CNTs). First, CNTs were functionalized with poly(acryloyl carbonate), a polymer bearing 6-membered cyclic carbonate groups (denoted PA6CC) via the surface reversible addition–fragmentation chain transfer polymerization approach. Thereafter, the PA6CC-grafted CNTs were dispersed in the mixtures of 6-membered bicyclic carbonate (6BCC) and tris(2-aminoethyl)amine. By initiating the curing reaction, the nanocomposites were successfully obtained with the content of CNTs up to 11 wt %. The morphological investigation showed that CNTs were well dispersed in the PHU matrix; the CNTs preserved good integrity. The PHU nanocomposites displayed a series of improved thermomechanical properties in terms of glass transition temperatures (Tg’s), tensile mechanical properties, and thermal conductivity. Compared to plain PHU thermoset, the PHU nanocomposites possessed enhanced dielectric constants and low dielectric loss. Owing to the introduction of CNTs, the nanocomposites displayed improved shape memory properties. It was found that the nanocomposites preserved reprocessing properties at elevated temperatures as plain PHU. The reprocessing properties bestowed the shape memory materials with reprograming ability of original shapes.
中文翻译：
具有多壁碳纳米管的聚（羟基聚氨酯）纳米复合材料：合成，形状记忆和后处理性能
聚（羟基氨基甲酸酯）（PHU）是通过非异氰酸酯方法合成的，可能是常规聚氨酯的潜在替代品。研究PHU的结构与属性之间的关系非常重要。在这项工作中，我们研究了含有多壁碳纳米管（CNT）的PHU纳米复合材料。首先，碳纳米管通过聚（丙烯酰碳酸酯）官能化，聚丙烯酸丙烯酰酯是通过六元环状碳酸酯基团（表示为PA6CC）形成的聚合物，通过表面可逆加成-断裂链转移聚合方法。此后，将PA6CC接枝的CNT分散在6-元双环碳酸酯（6BCC）和三（2-氨基乙基）胺的混合物中。通过引发固化反应，成功地获得了纳米复合材料，其CNT的含量最高为11wt％。形态研究表明，碳纳米管很好地分散在PHU基体中。碳纳米管保持良好的完整性。PHU纳米复合材料在玻璃化转变温度（T g）方面显示出一系列改善的热机械性能。的），拉伸机械性能和导热系数。与普通的PHU热固性材料相比，PHU纳米复合材料具有增强的介电常数和低介电损耗。由于引入了CNT，纳米复合材料显示出改善的形状记忆性能。已经发现，纳米复合材料在升高的温度下保持了普通PHU的后处理性能。加工性能赋予形状记忆材料以原始形状的重新编程能力。
更新日期：2020-04-23
中文翻译：
具有多壁碳纳米管的聚（羟基聚氨酯）纳米复合材料：合成，形状记忆和后处理性能
聚（羟基氨基甲酸酯）（PHU）是通过非异氰酸酯方法合成的，可能是常规聚氨酯的潜在替代品。研究PHU的结构与属性之间的关系非常重要。在这项工作中，我们研究了含有多壁碳纳米管（CNT）的PHU纳米复合材料。首先，碳纳米管通过聚（丙烯酰碳酸酯）官能化，聚丙烯酸丙烯酰酯是通过六元环状碳酸酯基团（表示为PA6CC）形成的聚合物，通过表面可逆加成-断裂链转移聚合方法。此后，将PA6CC接枝的CNT分散在6-元双环碳酸酯（6BCC）和三（2-氨基乙基）胺的混合物中。通过引发固化反应，成功地获得了纳米复合材料，其CNT的含量最高为11wt％。形态研究表明，碳纳米管很好地分散在PHU基体中。碳纳米管保持良好的完整性。PHU纳米复合材料在玻璃化转变温度（T g）方面显示出一系列改善的热机械性能。的），拉伸机械性能和导热系数。与普通的PHU热固性材料相比，PHU纳米复合材料具有增强的介电常数和低介电损耗。由于引入了CNT，纳米复合材料显示出改善的形状记忆性能。已经发现，纳米复合材料在升高的温度下保持了普通PHU的后处理性能。加工性能赋予形状记忆材料以原始形状的重新编程能力。
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