炭气凝胶微球的凝胶化机理

刘 宁 李明远 符若文

炭气凝胶微球的凝胶化机理

刘宁李明远符若文

1.
中山大学材料科学研究所聚合物复合材料及功能材料教育部重点实验室|广东广州 510275;
2.
广东药学院药科学院,广东广州 510006

基金项目: 国家自然科学基金 (50472029，50632040),教育部博士点基金,广州市科技计划项目(2007Z2-D2041).

详细信息

中图分类号: TQ 427.2+6
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出版历程
- 收稿日期: 2007-08-30
- 录用日期: 2009-11-05
- 修回日期: 2008-06-04
- 刊出日期: 2009-03-20

The gelation mechanism of carbon aerogel spheres

LIU Ning|

1.
Materials Science Institute, PCFM laboratory, Zhongshan (Sun Yatsen) University, Guangzhou 510275, China;
2.
College of Pharmacy, GuangDong Pharmaceutical University, Guangzhou 510006, China

Funds: National Natural Science Foundation of China (50472029, 50632040), Doctor Science Foundation of Ministry of Education of China, Scientific and Technological Program of Guangzhou Municipal (2007Z2-D2041)

摘要

摘要: 以间苯二酚和甲醛为原料，溴化十六烷三甲基铵为催化剂，通过反相悬浮聚合法成功制备了炭气凝胶微球。研究了反应体系的黏度、酸度、温度以及反应中间产物紫外光谱的变化情况，探讨该凝胶反应的作用机理。结果表明：凝胶反应是一个酚醛缩合过程，其反应历程可以分为线性缩聚、交联、胶粒生长和宏观凝胶化四个阶段。
- 炭气凝胶 /
- 微球 /
- 凝胶化 /
- 机理
Abstract: Carbon aerogel (CA) spheres were prepared by an inverse phase suspension polymerization of resorcinol and formaldehyde (RF) monomers with hexadecyltrimethylammonium bromide as catalyst. The gelation mechanism of RF gel was investigated by analyzing the changes of viscosity, pH, temperature and the UV spectra of the as-formed sol. Results indicate that the gelation of resorcinol and formaldehyde is a condensation polymerization, which can be divided into four stages including linear condensation, cross-linking, growth of colloidal particles and macroscopic gelation.
- Carbon aerogel /
- Spheres /
- Gelation /
- Mechanism