Abstract: Cellulose gelling material with a spatial chemical crosslinking structure was prepared by using natural cellulose as raw material，citric acid as crosslinking agent，trisodium citrate as catalyst through the “cyclic anhydride-esterification” reaction process. The chemical structure and microstructure of the gelling material were characterized，and the performance of the gelling material was studied. Recrystallization occurred in the cellulose macromolecular aggregates when preparing the material. With increasing cellulose initial concentration，the stacking structure of the gelling material became gradually denser and typing characteristics was more obvious. Thermal decomposition temperature was in the range from 280℃ to 350℃；specific heat capacity of the gelling material was 7.564—15.660J/(g?K) and thermal conductivity was 0.43—0.51W/(m?K). Besides，water absorption was in the range from 72.6% to 96.7% and storage modulus was 52.948—162.59MPa. Good heat storage，heat-insulating properties and storage modulus make the gelling material useful in preparing plaminated material.

Key words: polymers, chemical reaction, heat conduction, cellulose gelling material, sol-gel method, catalysis crosslinking reaction

摘要： 以天然纤维素为原料，柠檬酸（CA）为交联剂，柠檬酸三钠（TSC）为催化剂，经“环酐-酯化”反应制备了一种具备空间化学交联结构的纤维素凝胶材料。使用红外光谱仪、扫描电镜和X射线衍射仪分别表征了该种凝胶材料的化学结构和微观结构，并研究了该种凝胶材料的相关性能。结果表明，纤维素大分子聚集体在制备过程中发生了重结晶；随着初始纤维素浓度增大，凝胶材料的堆积结构逐渐致密并出现明显的分型特质。凝胶材料的热分解温度为280～350℃；比热容为7.564～15.660J/(g?K)；热导率为0.43～0.51W/(m?K)；吸水率为72.6%～96.7%；储能模量为52.948～162.59MPa。良好的储热、隔热性能和储能模量使得该种材料有望应用在保温包装夹层材料领域。

关键词: 聚合物, 化学反应, 热传导, 纤维素凝胶材料, 溶胶-凝胶法, 催化交联反应