不同改性木质素对木聚糖复合水凝胶性能的影响,Journal of Applied Polymer Science

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不同改性木质素对木聚糖复合水凝胶性能的影响
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-11-13 , DOI: 10.1002/app.54910
Yun Dou ₁ , Xiaohui Wang _{1,

2} , Zhongming Liu ₁ , Fangong Kong _{1,

2} , Shoujuan Wang ₁

Affiliation

为了提高半纤维素水凝胶的力学性能，以改性木质素为增强剂，成功制备了一种绿色、力学性能可调、高溶胀比（SR）复合水凝胶。通过TGA、FTIR、SEM、流变分析和SR研究了复合水凝胶的结构和特性。可以发现，改性木质素可以显着提高复合水凝胶的力学性能。未改性木质素水凝胶的最大压缩应力为61.72 kPa，压缩变形率为75%。与未改性木质素水凝胶相比，力学性能显着提高，改性木质素水凝胶的最大压应力为145.2 kPa，压缩变形高达90%。添加改性木质素后，所制备的水凝胶的SR高达155.17 g/g，远高于未改性木质素水凝胶的SR（105.79 g/g）。复合水凝胶具有良好的抗氧化性能，自由基去除率可达85.3%，是未改性木质素的2倍。以经济有效的木质素作为增强剂，所制备的机械性能可调的半纤维素水凝胶具有巨大的应用潜力。

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Effect of different modified lignins on the properties of xylan composite hydrogels

To improve the mechanical properties of hemicellulose hydrogel, a green, adjustable mechanical property, high swelling ratio (SR) composite hydrogel was successfully prepared by using modified lignin as a reinforcing agent. The structure and characteristics of the composite hydrogels were investigated by TGA, FTIR, SEM, rheological analysis, and SR. It can be found that the modified lignin could significantly improve the mechanical properties of the composite hydrogels. The maximum compressive stress of unmodified lignin hydrogel was 61.72 kPa and the compressive deformation was 75%. Compared with the unmodified lignin hydrogel, the mechanical properties were significantly improved, with the maximum compressive stress of the modified lignin hydrogel was 145.2 kPa and the compressive deformation was up to 90%. After adding modified lignin, the SR of the as-prepared hydrogel was up to 155.17 g/g, which was much higher than that of unmodified lignin hydrogel (105.79 g/g). The composite hydrogel had good antioxidant properties, and the free radical removal rate can reach 85.3%, which is twice as much as that without the modified lignin. With cost-effective lignin as a reinforcing agent, the as-prepared hemicellulose hydrogel with adjustable mechanical properties is favorable for great application potential.

更新日期：2023-11-13

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