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Ultra-low shrinkage chitosan aerogels trussed with polyvinyl alcohol
Materials & Design ( IF 8.4 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.matdes.2018.07.004
Sizhao Zhang , Junzong Feng , Jian Feng , Yonggang Jiang , Liangjun Li

Abstract Naturally-derived materials have attracted numerous attention owing to a unique native set of properties, but the significant shrinkage of biomass aerogel, from its final wet gel to aerogel, remains a formidable challenge. Here we explore a strategy based on supramolecular interaction and covalent crosslinking to overcome the inherent large shrinkage of chitosan aerogel, by reinforcing its molecular-level structure. The introduction of linear polyvinyl alcohol (PVA) chains can adequately interpenetrate with crosslinked chitosan chains to form strong intermolecular network architecture. Chitosan aerogel trussed with PVA enables to be readily fine-tuned, simultaneously giving rise to nano-sized cellular voids inside the aerogel. Chitosan aerogel obtained shows good heat insulation, applicable compressive property and exceptional processing feature of special-shaped components. We also find an emergent phenomenon that the addition of PVA may steer desirable orientation shrinkage, and linear elasticity at low strain in terms of chitosan aerogel.

中文翻译:

超低收缩率壳聚糖气凝胶与聚乙烯醇结合

摘要 天然衍生材料由于其独特的天然性质而引起了广泛关注,但生物质气凝胶从最终湿凝胶到气凝胶的显着收缩仍然是一个艰巨的挑战。在这里,我们探索了一种基于超分子相互作用和共价交联的策略,通过加强其分子级结构来克服壳聚糖气凝胶固有的大收缩。线性聚乙烯醇(PVA)链的引入可以与交联的壳聚糖链充分互穿,形成强大的分子间网络结构。与 PVA 捆绑在一起的壳聚糖气凝胶可以很容易地进行微调,同时在气凝胶内产生纳米尺寸的细胞空隙。得到的壳聚糖气凝胶显示出良好的隔热性,适用于异型件的抗压性能和特殊的加工特性。我们还发现了一个紧急现象,即加入 PVA 可以控制理想的取向收缩,以及壳聚糖气凝胶在低应变下的线性弹性。
更新日期:2018-10-01
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