The role of rheological premonitory of hydrogels based on cellulose nanofibers and polymethylsilsesquioxane on the physical properties of corresponding aerogels,Polymer Engineering and Science

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The role of rheological premonitory of hydrogels based on cellulose nanofibers and polymethylsilsesquioxane on the physical properties of corresponding aerogels
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-02-22 , DOI: 10.1002/pen.25671
Pragya Gupta ₁ , Akanksha Pandey ₁ , Kirtiraj K. Gaikwad ₂ , Sunanda Roy ₃ , Pradip K. Maji ₁

Affiliation

Cellulose nanofibers (CNFs) and polymethylsilsesquioxane (PMSQ)‐based aerogels (CNF/PMSQ aerogels) have been prepared by the sol–gel method. The extraction of CNFs from pine wood and formation of composite aerogel with PMSQ were confirmed by Fourier transform infrared spectroscopic and field emission scanning electron microscopic analyses. The rheological premonitory of hydrogel has been performed to predict the physical properties (i.e., density, mechanical properties) of aerogels. The variation in the precursor (methyltrimethoxysilane [MTMS]) and urea content has shown a considerable effect on the storage modulus and phase angle of the hydrogel. The variation in urea content showed a 4–8% increment in the density with a pronounced difference in aerogel's morphology. The increment in the MTMS concentration demonstrated a 10–20% enhancement in density with a minor change in morphology. The van Gurp–Palmen plot of hydrogel has represented a relationship between complex modulus and phase angle. This study establishes that hydrogel's premonitory analysis could compare aerogel's physical properties without going through drying and further analysis.

中文翻译：

基于纤维素纳米纤维和聚甲基倍半硅氧烷的水凝胶的流变学监测对相应气凝胶物理性质的作用

纤维素纳米纤维（CNFs）和基于聚甲基硅倍半氧烷（PMSQ）的气凝胶（CNF / PMSQ气凝胶）已通过溶胶-凝胶法制备。傅里叶变换红外光谱和场发射扫描电镜分析证实了松木中CNF的提取和PMSQ复合气凝胶的形成。已经进行了水凝胶的流变学预测以预测气凝胶的物理性质（即密度，机械性质）。前体（甲基三甲氧基硅烷[MTMS]）和尿素含量的变化已显示出对水凝胶的储能模量和相角的显着影响。尿素含量的变化表明密度增加了4-8％，气凝胶的形态也有明显的差异。MTMS浓度的增加表明密度增加了10％至20％，形态发生了微小变化。水凝胶的van Gurp-Palmen图表示复数模量和相角之间的关系。这项研究建立了水凝胶的监测分析可以比较气凝胶的物理性质，而无需经过干燥和进一步分析。

更新日期：2021-04-09

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