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首页> 外文期刊>Journal of Applied Polymer Science >Semi-interpenetrating polymer network hydrogels based on aspen hemicellulose and chitosan: Effect of crosslinking sequence on hydrogel properties
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Semi-interpenetrating polymer network hydrogels based on aspen hemicellulose and chitosan: Effect of crosslinking sequence on hydrogel properties

机译：基于白杨半纤维素和壳聚糖的半互穿聚合物网络水凝胶：交联顺序对水凝胶性能的影响

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摘要

Semi-interpenetrating network hydrogel films were prepared using hemicellulose and chemically crosslinked chitosan. Hemicellulose was extracted from aspen by using a novel alkaline treatment and characterized by HPSEC, and consisted of a mixture of high and low molecular weight polymeric fractions. HPLC analysis of the acid hydrolysate of the hemicellulose showed that its major constituent sugar was xylose. X-ray analysis showed that the relative crystallinity of hydrogels increased with increasing hemicellulose content up to 31.3%. Strong intermolecular interactions between chitosan and hemicellulose were evidenced by FT-IR analysis. Quantitative analysis of free amino groups showed that hemicellulose could interrupt the chemical crosslinking of chitosan macromolecules. Mechanical testing and swelling experiments were used to define the effective network crosslink density and average molecular weight between crosslinks. Swelling ratios increased with increasing hemicellulose content and mainly consisted of H-bonded bound water. Results revealed that by altering the hydrogel preparation steps and hemicellulose content, crosslink density and swelling behavior of semi-IPN hydrogels could be controlled without deteriorating their mechanical properties.
机译：使用半纤维素和化学交联的壳聚糖制备半互穿网络水凝胶薄膜。通过使用新型碱处理从白杨中提取半纤维素并通过HPSEC对其进行表征，该半纤维素由高分子量和低分子量聚合物级分的混合物组成。半纤维素的酸水解物的HPLC分析表明，其主要成分糖是木糖。 X射线分析表明，水凝胶的相对结晶度随半纤维素含量的增加而增加，最高可达31.3％。 FT-IR分析证明了壳聚糖和半纤维素之间的强分子间相互作用。游离氨基的定量分析表明，半纤维素可以中断壳聚糖大分子的化学交联。使用机械测试和溶胀实验来定义有效的网络交联密度和交联之间的平均分子量。溶胀率随半纤维素含量的增加而增加，且主要由氢键结合水组成。结果表明，通过改变水凝胶的制备步骤和半纤维素含量，可以控制半IPN水凝胶的交联密度和溶胀行为，而不会降低其机械性能。

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