氨基硅烷接枝纤维素纳米晶体气凝胶的制备及性能表征  

Preparation and Characterization of Amino-silane Grafted Cellulose Nanocrystalline Aerogels

作　　者：张天蒙 张洋[1] 姚远[1] 刘双[1] 王晓宇[1] Zhang Tianmeng;Zhang Yang;Yao Yuan;Liu Shuang;Wang Xiaoyu(Nanjing Forestry University, Nanjing 210037, P. R. China)

机构地区：[1]南京林业大学,南京210037

出　　处：《东北林业大学学报》2018年第12期98-103,共6页Journal of Northeast Forestry University

基　　金：林业公益性行业科研专项(201504603)

摘　　要：为扩展纤维素气凝胶的高值化应用,提高其对CO_2的吸附量,将纤维素纳米晶体(CNC)水凝胶与胺化剂3-(2-氨基乙基氨基)丙基甲基二甲氧基硅烷(AEAPMDS)反应,再经冷冻干燥得到胺接枝CNC气凝胶。探索不同AEAPMDS质量分数、不同反应温度对气凝胶中氮质量分数的影响,得到氮质量分数最大时的工艺条件:AE-APMDS质量分数为12%,温度100℃。通过采用多种仪器检测,比较添加胺化剂前后气凝胶的结构及性能变化。红外光谱(FTIR)结果表明氨基硅烷成功接枝到纤维素骨架上;比表面积、孔隙度分析(BET)和扫描电镜(SEM)结果显示,接枝后气凝胶比表面积由143.13 m^2·g^(-1)降至77.14 m^2·g^(-1),内部发生一定的交联团聚,孔密度随之降低;热质量分析(TG-DTG)结果表明改性后热稳定性有一定的提高;CO_2吸附测试得到胺接枝CNC气凝胶的CO_2吸附量达到1.68 mmol·g^(-1),较未加胺化剂时有显著的提升(提高546%),作为CO_2吸附材料具有广阔的前景。In order to expand the high value application of cellulose aerogel, and increase the amount of CO 2 adsorbed. The cellulose nanocrystalline (CNC) gel was reacted with the aminating agent 3-(2-aminoethylamino) propylmethyldimethoxysilane (AEAPMDS) and freeze-dried to produce the amine-grafted CNC aerogels. The effects of different AEAPMDS concentrations and different reaction temperatures on the nitrogen content in aerogels were explored to obtain the process conditions with the maximum nitrogen content: AEAPMDS concentration was 12% and the temperature was 100 ℃. The structure and properties of aerogels before and after amination were compared by various instruments. The results of infrared spectroscopy (FTIR) indicated that the aminosilane was successfully grafted onto the cellulose skeleton. Specific surface area and porosity analysis (BET) and scanning electron microscopy (SEM) results showed that the specific surface area of aerogel was decreased from 143.13 to 77.14 m 2·g -1 after grafting, internal cross-linking agglomeration occurred, and the pore volume was decreased. Thermogravimetric analysis (TG-DTG) results show that the thermal stability after modification was improved. CO 2 adsorption test showed that CO 2 adsorption of amine-grafted CNC aerogel reached 1.68 mmol·g -1 , which was significantly higher than that of the non-amination agent (up to 546%). It has broad prospect as a CO 2 adsorption material.

关 键 词：纤维素纳米晶体 氨基硅烷 气凝胶 接枝 CO2吸附 

分 类 号：TQ352[化学工程]