| 催化剂种类对间苯二酚甲醛气凝胶结构的影响 |
| |
| 引用本文： | 李文翠,朱盛维,郭树才.催化剂种类对间苯二酚甲醛气凝胶结构的影响[J].大连理工大学学报,2000,40(4):417-419. |
| |
| 作者姓名： | 李文翠 朱盛维 郭树才 |
| |
| 作者单位： | 大连理工大学,炭资源综合利用开放实验室,辽宁,大连,116012 |
| |
| 基金项目： | 国家自然科学基金资助项目 !( 596 72 0 2 6 ) |
| |
| 摘 要： | 首次以Ｋ２ＣＯ３、Ｃａ（ＯＨ）２为催化剂制备ＲＦ炭气凝胶，相同条件下溶胶转变为凝胶的时间（ｔｇ）最低达到４０ｍｉｎ，且密度优于Ｎａ２ＣＯ３催化得到的ＲＦ气交，最低为０．０４７ｇ／ｃｍ＾３。ＴＥＭ表征结果显示：Ｃａ（ＯＨ）２催化得到的气凝胶具有纳米级网络结构，构成网络的球状颗粒均匀，平均直径５～１０ｎｍ，网络结构优于文献报道。
|
| 关 键 词： | 超临界干燥 气凝胶 间苯二酚 甲醛 催化剂 种类 |
Influence of catalyst type on structure of aerogels from resorcinol with formaldehyde |
| |
| LI Wen-cui,ZHU Sheng-wei,GUO Shu-cai.Influence of catalyst type on structure of aerogels from resorcinol with formaldehyde[J].Journal of Dalian University of Technology,2000,40(4):417-419. |
| |
| Authors: | LI Wen-cui ZHU Sheng-wei GUO Shu-cai |
| |
| Abstract: | The polycondensation of resorcinol with formaldehyde under Na 2CO 3 conditions results in the formation of RF aerogels by sol gel process, supercritical drying. The gelation time ( t g ) is always longer than 9 hours. In this paper, Ca(OH) 2 and K 2CO 3 are firstly taken as catalysts to prepare RF carbon aerogels. TEM is used to study the structure of RF aerogels. The results show: the minimum of t g is 40 min, and the density of RF aerogels decreases to 0.047 g/cm 3 under the same conditions. Carbon aerogels prepared under Ca(OH) 2 have a cross linked network in nanometer scale while the colloid particles are well distributed and the size of particles is about 5~10 nm. |
| |
| Keywords: | sol gel process supercritical drying potassium carbonate calcium hydroxide/RF aerogels |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
