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Shape Memory and Self-Healing Nanocomposites with POSS–POSS Interactions and Quadruple Hydrogen Bonds
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-07-15 , DOI: 10.1021/acsapm.0c00446 Sen Xu 1 , Bingjie Zhao 1 , Mohsin Raza 1 , Lei Li 1 , Huaming Wang 1 , Sixun Zheng 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-07-15 , DOI: 10.1021/acsapm.0c00446 Sen Xu 1 , Bingjie Zhao 1 , Mohsin Raza 1 , Lei Li 1 , Huaming Wang 1 , Sixun Zheng 1
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The organic–inorganic nanocomposites were constructed via polyhedral oligomeric silsesquioxanes (POSS)–POSS interactions and supramolecular quadruple hydrogen bonds. First, a double-decker silsesquioxane (DDSQ) was functionalized with two trithiocarbonate groups. Thereafter, the functionalized DDSQ was used to mediate the radial copolymerization of butyl acrylate (BA) with 2-ureido-4[1H]-pyrimidinone acrylate (UPyA). The reversible addition–fragmentation chain transfer (RAFT) polymerizations afforded the organic–inorganic hybrids with the architecture that a single POSS cage was embedded in the middle of a P(BA-co-UPyA) copolymer chain. The morphological investigation showed that the organic–inorganic hybrids were microphase-separated; the POSS (viz., DDSQ) cages were aggregated into the microdomains with diameter 10–20 nm. It was found that the organic–inorganic nanocomposites simultaneously had shape memory and self-healing properties. The shape memory and self-healing properties can be regulated with the supramolecular quadruple bonding interactions. The shape memory properties are attributable to the formation of physical cross-linking in the materials, whereas the self-healing properties are responsible for the introduction of dynamic noncovalent bonds (viz., quadruple hydrogen bonds). The self-healing properties can be utilized to reprogram the original shapes of the shape memory nanocomposites.
中文翻译：
具有POSS-POSS相互作用和四重氢键的形状记忆和自我修复纳米复合材料
有机-无机纳米复合材料是通过多面体低聚倍半硅氧烷（POSS）-POSS相互作用和超分子四氢键构建的。首先，使用两个三硫代碳酸酯基团对双层倍半硅氧烷（DDSQ）进行功能化。此后，使用官能化的DDSQ介导丙烯酸丁酯（BA）与丙烯酸2-脲基-4 [1 H ]-嘧啶酮（UPyA）的径向共聚。可逆的加成-断裂链转移（RAFT）聚合提供了有机-无机杂化体，其结构是将单个POSS笼嵌入P（BA- co- UPyA）共聚物链的中间。形态研究表明，有机-无机杂种是微相分离的。POSS（也就是DDSQ）笼子聚集到直径为10-20 nm的微区中。发现有机-无机纳米复合材料同时具有形状记忆和自我修复特性。形状记忆和自我修复特性可以通过超分子四重键相互作用来调节。形状记忆性能可归因于材料中物理交联的形成，而自我修复性能则可引入动态非共价键（即四氢键）。可以利用自我修复特性对形状记忆纳米复合材料的原始形状进行重新编程。
更新日期：2020-08-14
中文翻译：
具有POSS-POSS相互作用和四重氢键的形状记忆和自我修复纳米复合材料
有机-无机纳米复合材料是通过多面体低聚倍半硅氧烷（POSS）-POSS相互作用和超分子四氢键构建的。首先，使用两个三硫代碳酸酯基团对双层倍半硅氧烷（DDSQ）进行功能化。此后，使用官能化的DDSQ介导丙烯酸丁酯（BA）与丙烯酸2-脲基-4 [1 H ]-嘧啶酮（UPyA）的径向共聚。可逆的加成-断裂链转移（RAFT）聚合提供了有机-无机杂化体，其结构是将单个POSS笼嵌入P（BA- co- UPyA）共聚物链的中间。形态研究表明，有机-无机杂种是微相分离的。POSS（也就是DDSQ）笼子聚集到直径为10-20 nm的微区中。发现有机-无机纳米复合材料同时具有形状记忆和自我修复特性。形状记忆和自我修复特性可以通过超分子四重键相互作用来调节。形状记忆性能可归因于材料中物理交联的形成，而自我修复性能则可引入动态非共价键（即四氢键）。可以利用自我修复特性对形状记忆纳米复合材料的原始形状进行重新编程。
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