催化剂种类对间苯二酚甲醛气凝胶结构的影响  

Influence of catalyst type on structure of aerogels from resorcinol with formaldehyde

作　　者：李文翠[1] 朱盛维[1] 郭树才[1] 

机构地区：[1]大连理工大学炭资源综合利用开放实验室,辽宁大连116012

出　　处：《大连理工大学学报》2000年第4期417-419,共3页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目 !( 596 72 0 2 6 )

摘　　要：首次以 K2 CO3 、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 40 m in,且密度优于 Na2 CO3 催化得到的 RF气凝胶 ,最低为 0 .0 47g/cm3 .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～ 10 nm 。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.

关 键 词：超临界干燥 气凝胶 间苯二酚 甲醛 催化剂 种类 

分 类 号：O648.17[理学—物理化学]