| 对位芳纶气凝胶粉体的制备与性能研究 |
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| 引用本文： | 谢春杰,何然,庹新林,杨万泰. 对位芳纶气凝胶粉体的制备与性能研究[J]. 化工学报, 2021, 72(12): 6361-6370. DOI: 10.11949/0438-1157.20211071 |
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| 作者姓名： | 谢春杰 何然 庹新林 杨万泰 |
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| 作者单位： | 清华大学化学工程系,北京100084 |
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| 基金项目： | 国家自然科学基金项目(52073154);山东省重点研发计划(重大科技创新工程)项目(2019TSLH0109);清华大学(化工系)-黄河三角洲京博化工研究院有限公司高性能高分子材料联合研究中心基金项目;清华大学“水木学者”计划项目 |
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| 摘 要： | 以对位芳纶纳米纤维(PANF)水凝胶为原料，将冻凝胶粉碎法与冷冻干燥法相结合，制备出PANF气凝胶粉体。系统研究了对位芳纶气凝胶粉体的微观结构及性能参数，以及制备条件对产物形貌的影响，并初步探究了其应用。结果表明，液氮冷冻制备的PANF气凝胶粉体具有多孔结构，松装密度约为17.0 kg?m-3，孔隙率约为98.8%，BET比表面积可达126.30 m2?g-1。PANF气凝胶粉体的耐热性优异，在氮气气氛下500℃前几乎无分解；热导率较低，约为0.03 W?m-1·K-1。气凝胶粉体具有吸附罗丹明B等染料的特征，同时可作为纳米填充材料增强聚氨酯乳胶膜等聚合物材料的硬度，其低热导率表明其有望应用于绝热领域。
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| 关 键 词： | 对位芳纶纳米纤维 气凝胶粉体 制备 吸附 复合材料 |
| 收稿时间： | 2021-08-02 |
Preparation and performance of para-aramid aerogel powders |
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| Chunjie XIE,Ran HE,Xinlin TUO,Wantai YANG. Preparation and performance of para-aramid aerogel powders[J]. Journal of Chemical Industry and Engineering(China), 2021, 72(12): 6361-6370. DOI: 10.11949/0438-1157.20211071 |
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| Authors: | Chunjie XIE Ran HE Xinlin TUO Wantai YANG |
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| Affiliation: | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Using para-aramid nanofiber (PANF) hydrogel as raw material, the cryogel crushing method and freeze-drying method are combined together to prepare PANF aerogel powder. The microstructure and performance parameters of para-aramid aerogel powder and the influence of preparation conditions on the morphology of the product were systematically studied, and its application was preliminarily explored. The results showed that the aerogel powders have a porous structure. The apparent density, porosity, and Brunauer-Emmett-Teller surface aerogel area are about 17.0 kg?m-3, 98.8% and 126.30 m2?g-1, respectively. The thermal stability of aerogel powders is excellent and almost no decomposition occurs before 500°C under nitrogen atmosphere. The thermal conductivity of aerogel powder is as low as 0.03 W?m-1·K-1. The aerogel powders can be utilized for the adsorption of some kinds of dyes, such as Rhodamine B. Furthermore, the aerogel powders can be used as nanofiller to improve the mechanical performance of some kinds of polymers, such as the hardness of polyurethane latex film. The low thermal conductivity indicated that the aerogel powder might be applied in the area of thermal insulation. |
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| Keywords: | para-aramid nanofiber aerogel powders preparation adsorption composites |
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