Role of rheological properties on physical chitosan aerogels obtained by supercritical drying.,Carbohydrate Polymers

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Role of rheological properties on physical chitosan aerogels obtained by supercritical drying.
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2020-01-11 , DOI: 10.1016/j.carbpol.2020.115850
Antonio Tabernero ₁ , Lucia Baldino ₂ , Alexander Misol ₃ , Stefano Cardea ₂ , Eva M Martín Del Valle ₄

Affiliation

Chitosan aerogels were obtained after using supercritical carbon dioxide to dry physical hydrogels, studying the effect of the rheological behavior of hydrogels and solutions on the final aerogels properties. An increase on the solutions pseudoplasticity increased the subsequent hydrogels physical entanglement, without showing a significant effect on aerogels morphology (nanoporous) and textural properties (pores of about 10 nm). However, an increase of hydrogel physical entanglement promoted the formation of aerogels with a higher compressive strength (from 0.2 to 0.80 MPa) and higher thermal decomposition range, while decreasing the porosity (from 90 % to 94 %). Aerogels stress-strain responses were also successfully fitted using a hyperelastic equation with three adjustable parameters (Yeoh), showing that this type of models must be taken into account when large stresses are studied.

中文翻译：

流变性质对通过超临界干燥获得的物理壳聚糖气凝胶的作用。

使用超临界二氧化碳干燥物理水凝胶后，获得壳聚糖气凝胶，研究水凝胶和溶液的流变行为对最终气凝胶性能的影响。溶液假性可塑性的增加增加了随后的水凝胶的物理缠结，而对气凝胶的形态（纳米孔）和质地特性（约10 nm的孔）没有显着影响。然而，水凝胶物理缠结的增加促进了具有更高的抗压强度（从0.2到0.80 MPa）和更高的热分解范围的气凝胶的形成，同时降低了孔隙率（从90％到94％）。还使用具有三个可调参数的超弹性方程（Yeoh）成功拟合了气凝胶的应力-应变响应，

更新日期：2020-01-13

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