摘要
为了制备孔隙率高、降解性良好,并且在高温环境中性能良好的纤维素气凝胶,首先利用2,2,6,6-四甲基哌啶氧化物(TEMPO)介导氧化漂白的硫酸盐软木浆,制备纤维素微纤维(CMF);然后通过Zr^(4+)和Zr^(4+)/SiO_(2)溶胶前体溶液改性处理CMF以制备纤维素水凝胶;最后将水凝胶冷冻干燥获得Zr和Zr/Si杂化纤维素气凝胶。结果表明:制备得到的气凝胶,在高温化境下,Zr^(4+)能转化为耐热的氧化物,添加的SiO_(2)既能增加传统气凝胶结构,又能提升耐热性能;Zr^(4+)金属阳离子诱导CMF纤维自交联形成水凝胶化,TG和XRD表明Zr^(4+)和Zr^(4+)/SiO_(2)附着在纤维素表面上,形成了耐高温层;Zr/Si纤维素气凝胶在高温环境下比Zr纤维素气凝胶具有更好的隔热性和耐高温性能。
To prepare cellulose aerogels with high porosity,good degradability and good performance in high temperature environment,first of all,we prepare cellulose microfibers(CMF)from bleached sulfate softwood pulp by means of 2,2,6,6-tetramethylpiperidine-1-oxyl radical(TEMPO)mediated oxidation,then prepare cellulose hydrogels by modifying CMF using Zr^(4+)and Zr^(4+)/SiO_(2)sol precursor solutions,and finally freeze-dry the hydrogel,so as to obtain Zr and Zr/Si hybrid cellulose aerogels.The results show that in the prepared aerogel,under high temperature conditions,Zr^(4+)can be converted into heat-resistant oxide.The added SiO_(2)can not only raise the traditional aerogel structure,but also improve the heat-resistant performance.Zr^(4+)metal cations induce the self-crosslinking of CMF to form hydrogel.TG and XRD show that Zr^(4+)and Zr^(4+)/SiO_(2)are attached to the surface of cellulose,forming a heat-insulating layer.Under high temperature conditions,Zr/Si cellulose aerogel has better thermal insulation and heat resistance than Zr cellulose aerogel.
作者
葛文斌
冯新星
张华鹏
GE Wenbin;FENG Xinxing;ZHANG Huapeng(Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China;Institute of Quartermaster Engineering&Technology,Institute of Systems Engineering,Academy of Military Science,Beijing 100010,China)
出处
《浙江理工大学学报（自然科学版）》
2021年第4期437-444,共8页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金青年科学基金项目(52003242)。
