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首页> 外文期刊>Journal of Applied Polymer Science >Nanostructure and viscoelasticity of layered silicate nanocomposite- electrolyte supports
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Nanostructure and viscoelasticity of layered silicate nanocomposite- electrolyte supports

机译：层状硅酸盐纳米复合电解质载体的纳米结构和粘弹性

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摘要

There is the need for novel polyelectrolytes with enhanced thermal and mechanical properties. In this report, we have reinforced a polyelectrolyte based on poly(dimethylaminoethylmethacrylate) (PDMAEM) using nanoclay montmorillonite (MMT), and have studied the thermal and viscoelastic properties. The protonated polymer (PDMAEMH) was solution mixed with functionalized MMT. Recognizing that the sort of surfactant may have a profound influence on the physical properties of the polymer matrix, neat MMT, and MMT treated with different surfactants (sulfobetaine and ammonia) were used, and the concentration of the nanofiller was varied from 1 to 5%w/w. Strikingly, while PDMAEM exhibited a glass transition temperature T_g of 32°C, the protonated PDMAEMH showed T_g = 155°C. Master curves obtained by applying the time-temperature superposition principle showed that PDMAEM behaved predominantly elastic (G″ < G′) suggesting an entangled polymer melt. However, PDMAEMH exhibited much longer relaxation times, a shift of ca. seven decades in frequency, suggesting that ionic interactions significantly hampered the molecular dynamics. X-ray scattering demonstrated that lower concentration and sulfobetaine surfactant favored exfoliation whereas ammonia and untreated MMT favored intercalation of the nanoplates. Furthermore, an enhancement in dynamic storage shear modulus was observed for the nanocomposites exhibiting intercalated morphologies relative to those displaying an exfoliated morphology. It is then suggested that the molecular dynamics is further slowed down due to confinement of the macromolecules between the nanoplates.
机译：需要具有增强的热和机械性能的新型聚电解质。在本报告中，我们使用纳米粘土蒙脱土（MMT）增强了基于聚（甲基丙烯酸二甲基氨基乙基酯）（PDMAEM）的聚电解质，并研究了其热和粘弹性。将质子化的聚合物（PDMAEMH）与功能化的MMT溶液混合。认识到表面活性剂的种类可能会对聚合物基质的物理性能产生深远的影响，使用纯净的MMT和使用不同的表面活性剂（磺基甜菜碱和氨水）处理过的MMT，纳米填料的浓度从1到5％不等w / w。令人惊讶的是，尽管PDMAEM的玻璃化转变温度T_g为32°C，但质子化的PDMAEMH的T_g = 155°C。通过应用时间-温度叠加原理获得的主曲线显示PDMAEM主要表现为弹性（G''

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