Ultrastiff, Thermoresponsive Nanocomposite Hydrogels Composed of Ternary Polymer–Clay–Silica Networks,Macromolecules

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Ultrastiff, Thermoresponsive Nanocomposite Hydrogels Composed of Ternary Polymer–Clay–Silica Networks
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.macromol.7b02305
Huan-Jun Li ₁ , Haoyang Jiang ₁ , Kazutoshi Haraguchi ₂

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Anomalous increases in mechanical stiffness and tensile strength were achieved in a poly(N-isopropylacrylamide) nanocomposite gel (NC gel) by incorporating a small amount of silica through the sol–gel reaction of tetraethyl orthosilicate in the polymer–clay network. The resulting NC-Si gels, with ternary polymer–clay–silica structures, exhibited very high tensile moduli (∼3500 kPa) and strengths (∼1700 kPa), as well as well-defined thermoresponsive swelling/deswelling behavior, through the incorporation of 0.2–2.5 wt % silica (relative to the gel weight). The reinforcing efficiency of in situ formed silica in the NC gel is more than 50 times that of clay, while the incorporation of preformed silica nanoparticles led to no observable changes in mechanical properties. The controllable range of hydrogel tensile mechanical properties was significantly extended by the preparation of NC-Si gels. The ternary polymer–clay–silica network structure was proposed on the basis of optical transmittance, TEM, EDS, and ²⁹Si NMR analyses, in addition to its mechanical and swelling/deswelling properties.

中文翻译：

由三元聚合物-粘土-二氧化硅网络组成的超硬，热响应性纳米复合水凝胶

在聚（N-异丙基丙烯酰胺）纳米复合凝胶（NC gel）中，通过在聚合物-粘土网络中通过原硅酸四乙酯的溶胶-凝胶反应掺入少量二氧化硅，可以实现机械刚度和拉伸强度的反常增加。所得的具有三元聚合物-粘土-二氧化硅结构的NC-Si凝胶通过掺入三氟乙烯，表现出非常高的拉伸模量（约3500 kPa）和强度（约1700 kPa）以及明确的热响应溶胀/溶胀行为0.2–2.5 wt％二氧化硅（相对于凝胶重量）。原位增强效率在NC凝胶中形成的二氧化硅比粘土多50倍，而预先形成的二氧化硅纳米粒子的掺入导致机械性能没有可观察到的变化。通过制备NC-Si凝胶，水凝胶拉伸机械性能的可控制范围得到了显着扩展。根据其透光率，TEM，EDS和²⁹ Si NMR分析，提出了三元聚合物-粘土-二氧化硅网络结构，此外还具有机械和溶胀/溶胀特性。

更新日期：2018-01-11

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