液化木基热塑性酚醛树脂的固化反应动力学

林产化学与工业 ›› 2009, Vol. 29 ›› Issue (1): 7-12.

液化木基热塑性酚醛树脂的固化反应动力学

李改云, 秦特夫, 任海青, 江泽慧

中国林业科学研究院木材工业研究所, 北京 100091

收稿日期:2007-09-04 修回日期:2008-11-17 出版日期:2009-02-28 发布日期:2009-02-28
通讯作者: 江泽慧,教授,博士生导师,主要从事木材科学与技术研究;E-mail:ligy@caf.ac.cn。

Kinetics of Curing Reaction of Novolak-type Phenol Formaldehyde Resin from Phenolated Wood

LI Gai-yun, QIN Te-fu, REN Hai-qing, JIANG Ze-hui

Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China

Received:2007-09-04 Revised:2008-11-17 Online:2009-02-28 Published:2009-02-28

摘要/Abstract

摘要： 利用差示扫描量热法(DSC)研究了液化木基热塑性树脂(PWF)的固化特征及其动力学,用热重法(TG)和傅立叶红外光谱技术(FT-IR)研究了固化后PWF的热降解性能和结构特征,并对比研究了传统热塑性酚醛树脂(PF)的固化反应,旨在为确定新型PWF的固化工艺提供依据。结果表明,六次甲基四胺(HMTA)用量对固化反应的表观活化能影响较大,HMTA与树脂质量比为100:10时,表观活化能较低,为107.76kJ/mol,低于相同条件下PF的表观活化能(141.35kJ/mol);HMTA用量对固化反应级数几乎没有影响,反应级数恒定在0.95,与PF的固化反应级数相同。最大固化速率温度和升温速率(T_p-β)外推法求得PWF固化工艺温度在135～137℃。PWF和PF的热重曲线变化趋势在30～291℃完全相同,两者在200℃以前几乎不发生失重现象,当温度超过200℃后,两者皆有轻微的失重,PWF和PF的热降解温度分别为291和296℃。IR结果证明固化后PWF和PF的结构相似。

关键词: 液化木基热塑性树脂, 固化动力学, 酚醛树脂

Abstract: The curing behaviors and kinetics of novolak-type phenolic resin from phenolated wood (PWF) were investigated with DSC. Thermal degradation properties and structure of cured PWF were analyzed by means of TG and FTIR, respectively. The curing reaction of PWF was compared with that of traditional novolak-type phenol formaldehyde resin (PF). The results showed that the amount of curing agent——hexamethylene tetramine (HMTA) had great influence on curing of PWF. When the mass ratio of HMTA and resin was 100:10, apparent activation energy of curing reaction of PWF was 107.76kJ/mol, which was lower than 141.35kJ/mol of PF. There was little effect of curing agent content on the order of curing reaction of PWF, and the order of PWF curing reaction was constantly 0.95, the same as PF's. Curing temperature of PWF was from 135 to 137℃ by extrapolating T_p-β. TG curve of cured PWF followed the similar trend as that of cured PF during the range of 30 to 291℃. Both were thermal stable and had no weight loss before 200℃ and they began to loss weight with further increasing of temperature. The temperatures of thermal degradation of cured PWF and PF were 291 and 296℃, respectively. The structure of cured PWF was nearly similar to that of cured PF confirmed by IR.

Key words: novolak-type liquefied wood-based resin, curing kinetics, phenol formaldehyde resin

中图分类号:

TQ323.1
S785

李改云;秦特夫;任海青;江泽慧. 液化木基热塑性酚醛树脂的固化反应动力学[J]. 林产化学与工业, 2009, 29(1): 7-12.

LI Gai-yun;QIN Te-fu;REN Hai-qing;JIANG Ze-hui. Kinetics of Curing Reaction of Novolak-type Phenol Formaldehyde Resin from Phenolated Wood[J]. , 2009, 29(1): 7-12.

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