Covalently integrated silica nanoparticles in poly(ethylene glycol)-based acrylate resins: thermomechanical, swelling, and morphological behavior
Covalently integrated silica nanoparticles in poly(ethylene glycol)-based acrylate resins: thermomechanical, swelling, and morphological behavior
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DOI：
10.1039/d1sm01377g
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发表时间：
2022-01-03
期刊：
影响因子：
3.4
通讯作者：
Green, Matthew D.
中科院分区：
文献类型：
--
作者：
Hocken, Alexis;Beyer, Frederick L.;Green, Matthew D.
纳米复合材料将功能性纳米填料集成到电子、轻质结构材料和组织工程的粘弹性基质中。在此，研究了甲基丙烯酸酯官能化（MA-SiO2）和乙烯基官能化（V-SiO2）二氧化硅纳米粒子对聚乙二醇（PEG）纳米复合材料的热、机械、物理和形态特征的影响。 V-SiO2 复合材料的凝胶分数在添加 3.8 wt% 时下降，但随着进一步添加（>7.4 wt%）而增加，直到达到 10.7 wt% 的稳定水平。 MA-SiO2 没有引起凝胶分数的显着变化，并且 V-SiO2 和 MA-SiO2 纳米颗粒对纳米复合材料玻璃化转变温度和吸水率的影响可以忽略不计。两种纳米颗粒的杨氏模量和极限压缩应力随着纳米颗粒浓度的增加而增加。由于交联密度较高，MA-SiO2 复合材料在浓度为 7.4 wt% 时达到最大机械应力，而 V-SiO2 复合材料在浓度为 10.7 wt% 时达到最大值。扫描电子显微镜、透射电子显微镜和小角 X 射线散射显示 V-SiO2 呈双峰尺寸分布，MA-SiO2 呈单峰尺寸分布。尽管两种纳米粒子表面处理都观察到聚集体，但 V-SiO2 分散性较差，而 MA-SiO2 一般分散良好。这些发现为先进制造应用的基于 PEG 的纳米复合材料中的二氧化硅纳米填料奠定了框架。
Nanocomposites integrate functional nanofillers into viscoelastic matrices for electronics, lightweight structural materials, and tissue engineering. Herein, the effect of methacrylate-functionalized (MA-SiO2) and vinyl-functionalized (V-SiO2) silica nanoparticles on the thermal, mechanical, physical, and morphological characteristics of poly(ethylene glycol) (PEG) nanocomposites was investigated. The gel fraction of V-SiO2 composites decreases upon addition of 3.8 wt% but increases with further addition (>7.4 wt%) until it reaches a plateau at 10.7 wt%. The MA-SiO2 induced no significant changes in gel fraction and both V-SiO2 and MA-SiO2 nanoparticles had a negligible impact on the nanocomposite glass transition temperature and water absorption. The Young's modulus and ultimate compressive stress increased with increasing nanoparticle concentration for both nanoparticles. Due to the higher crosslink density, MA-SiO2 composites reached a maximum mechanical stress at a concentration of 7.4 wt%, while V-SiO2 composites reached a maximum at a concentration of 10.7 wt%. Scanning electron microscopy, transmission electron microscopy, and small-angle X-ray scattering revealed a bimodal size distribution for V-SiO2 and a monomodal size distribution for MA-SiO2. Although aggregates were observed for both nanoparticle surface treatments, V-SiO2 dispersion was poor while MA-SiO2 were generally well-dispersed. These findings lay the framework for silica nanofillers in PEG-based nanocomposites for advanced manufacturing applications.