摘要
在碱性条件下,木质素可部分替代苯酚,通过树脂化生成木质素基酚醛树脂,酚醛树脂经物理发泡、高温碳化工艺制得木质素基酚醛泡沫炭。研究结果表明:木质素基酚醛泡沫的热稳定性良好,当纯化木质素添加量为20%(质量分数)时,木质素基酚醛最大炭收率为54. 60%,热稳定性优于其他泡沫;碳化后的4种木质素基酚醛泡沫炭(CF-L-0%、CF-L-10%、CF-L-20%、CF-L-30%)皆由100~600μm的泡孔及孔壁组成,其表观密度在0. 15~0. 23g/cm3之间,压缩强度最高可达3. 35MPa;4种木质素基酚醛泡沫炭为非石墨化的碳质结构,其微观结构以微孔为主;木质素基酚醛泡沫炭的碳含量随木质素替代量的增加而提高,碳质量分数最高可达72. 34%。
Under akaline condition,phenol could be replaced partially by lignin,lignin-based phenolic resin was prepared from purified lignin by resinification. Lignin-based phenolic carbon foam was prepared by physical foaming and hightemperature carbonization process of phenolic resin. The results showed that the foam had good thermal stability. The maximum carbon residue was 54. 6% when the replacement percentage of phenol by lignin was 20%,which was better than other foams.The four foams(CF-L-0%,CF-L-10%,CF-L-20%,CF-L-30%) were all composed of bubble hole and pore wall,which were between 100 ~ 600μm. Their bulk densities were between 0. 15 ~ 0. 23 g/cm3,compression strength was up to 3. 35 MPa. The four foams were non-graphitized carbonaceous,and the microporous structure were their main structures. The carbon content of foams were increased with the increase of lignin substitution,which was as high as 72. 34 wt%.
作者
周方浪
杨静
杨海艳
邓佳
王大伟
郑志锋
徐高峰
史正军
Zhou Fanglang;Yang Jing;Yang Haiyan;Deng Jia;Wang Dawei;Zheng Zhifeng;Xu Gaofeng;Shi Zhengjun(University Key Laboratory of Biomass Chemical Refinery&Synthesis,Southwest Forestry University,Kunming 650224;Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China,Southwest Forestry University,Kunming 650224)
出处
《化工新型材料》
CAS
CSCD
北大核心
2019年第11期149-154,共6页
New Chemical Materials
基金
国家自然科学基金(31760195、31560195)
国家重点研发专项(2017YFD0601003)
关键词
木质素
酚醛树脂
泡沫炭
lignin
phenolic resin
carbon foam
