Soft Hybrid Elastomers Containing Polymer Grafted Nanoparticles
Soft Hybrid Elastomers Containing Polymer Grafted Nanoparticles
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DOI：
10.1016/j.giant.2022.100133
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发表时间：
2022-11
期刊：
影响因子：
7
通讯作者：
Jensen N. Sevening;Siyana Dottin;Vincent M. Torres;R. Hickey
中科院分区：
文献类型：
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作者：
Jensen N. Sevening;Siyana Dottin;Vincent M. Torres;R. Hickey
含有无机纳米颗粒的软弹性体在软机器人和柔性电子器件中的应用很有意义，而成功应用于这些应用需要增强材料的韧性，同时保持低模量和高恢复率。控制纳米颗粒在混合材料中的分散对于调整物理性能是必要的，但许多用于制造填充橡胶的合成方法通常会导致宏观相分离。因此，需要替代的合成方法。在这里，我们报告了含有共价结合到橡胶基质上的聚合物接枝纳米颗粒（PGNP）的杂化弹性体的合成。具体而言，聚（降冰片烯）接枝二氧化硅纳米颗粒最初分散在甲基丙烯酸月桂酯单体和交联剂混合物中，然后聚合以产生杂化弹性体。聚合过程称为反应诱导相变 (RIPT)，可同时交联和捕获聚合物基质中的纳米颗粒，是制备软杂化弹性体的通用方法。随着纳米粒子负载量的增加（例如，0 至 10 wt%），PGNP 聚集体开始形成，并且模量增加。有趣的是，与纯交联基质相比，PGNP 负载量对弹性恢复的影响最小。正如本文所报道的，RIPT 工艺很容易适应交联橡胶基体，突出了该工艺的多功能性。
Soft elastomers containing inorganic nanoparticles are of interest for uses in soft robotics and flexible electronics, and successful implementation into these applications require enhanced material toughness while maintaining low moduli and high recovery. Controlling nanoparticle dispersion in hybrid materials is necessary to tune physical properties, yet many synthetic methods used to create filled rubbers often lead to macrophase separation. Therefore, alternative synthetic methods are required. Here, we report the synthesis of hybrid elastomers containing polymer grafted nanoparticles (PGNPs) covalently bound to a rubbery matrix. Specifically, poly(norbornene) grafted silica nanoparticles are initially dispersed in a lauryl methacrylate monomer and crosslinker mixture, and then polymerized to create the hybrid elastomer. The polymerization process, termed reaction-induced phase transitions (RIPT), to simultaneously crosslink and trap the nanoparticles in the polymer matrix is a versatile method for preparing soft hybrid elastomers. With increasing nanoparticle loading (e.g., 0 to 10 wt%), PGNP aggregates begin to form and there is an increase in the modulus. Interestingly, there is minimal impact on elastic recovery with respect to PGNP loading as compared to that of the neat, crosslinked matrix. As reported here, the RIPT process is easily adaptable to crosslinked rubbery matrices, highlighting the versatility of the process.