Repairable reinforced composites of 1D TiO2 lepidocrocite mesoparticles and thiol-yne click networks via alkylborane-initiated in situ polymerization
Repairable reinforced composites of 1D TiO2 lepidocrocite mesoparticles and thiol-yne click networks via alkylborane-initiated in situ polymerization
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DOI：
10.1016/j.xcrp.2023.101434
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发表时间：
2023-06-21
影响因子：
8.9
通讯作者：
Magenau，Andrew J. D.
中科院分区：
文献类型：
--
作者：
Wilson，Olivia R.;Carey，Michael S.;Magenau，Andrew J. D.
合成高性能多功能复合材料通常需要填料分散性差、工艺复杂或加工条件受限。因此，采用简单条件、廉价填料、标准设备和稳健反应的通用合成的出现可以扩展具有增强的性能、功能和可定制性的可获得的复合材料。我们报道了一种新的多功能弹性体复合材料的合成，从一个新的，增强二氧化钛基填料和可修复的，动态共价硫醇-炔网络或解离共价适应性网络。复合材料的处理通过原位聚合通过硫醇-炔“点击”化学引发的三烷基硼烷。复合加工产生定量的单体转化率和均匀的填料分散。填料是一种基于二氧化钛的介观颗粒，通过最近发现的，可扩展的，几乎通用的路线，从一维纤铁矿纳米丝自组装到广泛的纳米结构。与纯聚合物相比，使用60重量%填料实现了模量的47倍增强，这与理论一致。增强的交联复合材料是多功能的，在多个损伤修复周期中提供可再加工性，并恢复其机械性能。
Synthesizing high-performance, multifunctional composites often entails poor filler dispersion, complex processes, or limited processing conditions. Hence, the advent of versatile syntheses employing simple conditions, inexpensive fillers, standard equipment, and robust reactions could expand attainable composites having enhanced performance, functionality, and customizability. We report on the synthesis of a novel multifunctional elastomeric composite from a new, reinforcing titania-based filler and a repairable, dynamic-covalent thiol-yne network or dissociative covalent adaptable network. Composites were processed byin situpolymerization via thiol-yne "click" chemistry initiated with a trialkylborane. Composite processing yields quantitative monomer conversion and uniform filler dispersion. The filler was a titania-based mesoparticle, self-assembled from 1D lepidocrocite nanofilaments through a recently discovered, scalable, and nearly universal route to wide-ranging nanostructures. A 47-fold enhancement in the modulus was achieved with 60 wt % filler versus the neat polymer, agreeing with theory. The reinforced, cross-linked composites were multifunctional, providing reprocessability over multiple damage-repair cycles with restoration of their mechanical properties.