摘要
以端羧基丁腈橡胶(CTBN)和环氧树脂(CYD)的预聚物为热不稳定聚合物,酚醛树脂(PF)作为炭前驱体聚合物,采用化学共聚方法制备出酚醛树脂基三元共聚物(PF+CYD+CTBN)体系。通过红外光谱分析证实CYD中的部分环氧基与CTBN中的羧基反应生成酯键,而剩余的环氧基与酚醛树脂中的酚羟基反应生成醚键,CTBN-CYD预聚物以接枝或嵌段的形式接入到酚醛树脂的固化体系中。通过对不同热处理温度下的三元共聚物进行红外、热重分析及对热解产物的孔径分析表明,三元共聚物中的酯键在450℃时发生断裂,CTBN链段率先从三元共聚物体系中热解选出,并在所得多孔炭材料中形成了孔径主要分布在1~2nm左右的微孔。
Carboxyl terminated nitrile rubber (CTBN) and epoxy resins (CYD) pre-polymer as thermal decomposable polymer and phenol-formaldehyde resin (PF) as carbon precursor polymer, phenolic resin-based terpolymer (PF+CYD+CTBN) system was prepared by chemical copolymerization. Ester linkage was formed by the reaction of epoxy in CYD with carboxyl group in CTBN confirmed by the appearance of 1 738 cm-1 in FT-IR spectra. The pre-polymer was blocked or grafted to the phenol-formaldehyde curing resin by the ether bond formation between residual epoxy group in pre-polymer and hydroxyl group in PF resin. Ester linkage was broken at 450 ℃ and the pyrolysis of CTBN chain preferentially occurs testified by FT-IR and TG analysis. Porous carbon with abundance micropore in 1-2 nm was accordingly obtained.
出处
《炭素》
2012年第3期3-7,共5页
Carbon
基金
国家自然科学基金课题(50872032)
湖南大学国家级SIT项目
关键词
预聚反应
化学共聚
热解过程
孔隙结构
prepolymerization
chemical copolymerization
pyrolysis process
pore structure