文献类型：期刊文献

中文题名：酚醛树脂基泡沫炭的发泡行为及其孔结构控制

英文题名：Effects of heating rate on the foaming behavior and pore structure of carbon foams derived from phenol-formaldehyde resin

作者：龚青[1];詹亮[1];张永正[1];王艳莉[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,特殊功能高分子材料及其相关技术教育部重点实验室,上海200237

年份：2016

卷号：31

期号：4

起止页码：445

中文期刊名：新型炭材料

外文期刊名：New Carbon Materials

收录：CSTPCD;;EI(收录号：20163702796452);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000382512300011)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金(51472086,51002051);上海市自然科学基金(12ZR1407200)

语种：中文

中文关键词：泡沫炭;酚醛树脂;孔结构

外文关键词：Carbon foam; Phenol-formaldehyde resin; Pore structures

摘要：结合热塑性酚醛树脂的热失重和粘-温特性,研究了升温速率对其发泡行为及泡沫炭力学性能的影响。结果表明,热塑性酚醛树脂的发泡温区在200~300℃,并遵循热点成核发泡机制;300~600℃温区中产生的裂解气主要影响气泡的膨胀速度,进而影响泡沫炭的孔径及孔结构的均一性;以0.5℃/min升至240℃,再以3℃/min升至600℃,所制泡沫炭孔结构较为均一,其平均孔径、密度及压缩强度分别为300μm、0.51 g/cm^3和12.5 MPa。
The effect of heating rate on the foaming behavior of phenol-formaldehyde resin and the pore structure and compressive strength of the carbon foams produced were investigated.Results indicate that the viscosity of the resin changes little with temperature between 135 and 225℃,but increases abruptly above 225℃.The foams are formed between 200 and 300℃by gas released during pyrolysis and the foaming behavior follows the hot-spot nucleation mechanism.By increasing the heating rate from 0.5 to3℃/min the average pore size decreases from 304 to 267μm,and the density and compressive strength increase from 0.34 to0.51 g/cm^3 and 6.1 to 12.5 MPa,respectively.The heating rate affects the expansion velocity of the bubbles formed,and the average size and homogeneity of the pores in the foams.