机械力诱导双重交联各向异性纤维素水凝胶的制备与性能

Preparation and properties of mechanically induced double crosslinked anisotropic cellulose hydrogel

  • 摘要: 为改善传统纤维素水凝胶材料柔软易碎的性质,拓宽其应用领域,开发出具有优异力学性能的纤维素水凝胶,在LiOH-尿素体系中溶解纤维素后,先加入环氧氯丙烷制备出具有松散化学交联网络结构的纤维素水凝胶,再通过在酸溶液去除碱-尿素包裹体系后形成物理交联,获得具有初步取向的双交联纤维素水凝胶;在此基础上,沿长度方向调控机械力拉伸固定双网络结构水凝胶,获得不同力学性能的各向异性纤维素水凝胶。研究表明:经拉伸后水凝胶最大拉伸强度可达2.96 MPa,纤维素水凝胶在偏振光下出现彩色偏光现象,表现出典型的光学各向异性;通过该方法可构建出具有高强度、光学各向异性的纤维素水凝胶,该类水凝胶在智能软物质等领域具有良好的应用前景。

     

    Abstract: In order to improve the softness and fragility of traditional cellulose hydrogel materials, broaden its application area and develop cellulose hydrogels with excellent mechanical properties, the cellulose hydrogel with loose chemical crosslinking network was prepared by adding epichlorohydrin into cellulose dissolved in LiOH-urea aqueous solution. Then the alkali-urea inclusion complex in the acid solution was removed to introduce physical crosslinking. The dual-crosslinking cellulose hydrogel with temporary orientation was obtained. On this basis, the researcher regulated mechanical force to stretch and fix the hydrogel with double network structure along the length direction to obtain anisotropic cellulose hydrogels with different mechanical properties. Research shows, the maximum tensile strength of cellulose hydrogels can reach 2.96 MPa after stretching, and the cellulose hydrogel exhibits color polarization phenomenon under polarized light, showing typical optical anisotropy. This method can construct cellulose hydrogels with high strength and optical anisotropy. This type of hydrogels has good application prospects in the fields of intelligent soft matter and others.

     

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