纸浆纤维素苄基化及其反应动力学  

Benzylation of Pulp Cellulose and Its Kinetics

作　　者：曲保雪[1,2,3] 秦特夫[1] 储富祥[1,3] 

机构地区：[1]中国林业科学研究院木材工业研究所国家林业局木材科学与技术重点实验室,北京100091 [2]河北农业大学林学院,保定071000 [3]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林业科学》2011年第10期146-152,共7页Scientia Silvae Sinicae

基　　金：林业公益性行业科研专项经费(201104004);保定市科学研究与发展计划项目(10ZF068)

摘　　要：通过纸浆纤维素的苄基化试验,研究反应温度和反应时间对苄基化产物取代度的影响,证明适当延长反应时间、提高反应温度有利于提高产物的取代度。傅里叶红外光谱仪、差示扫描量热仪、X射线衍射仪等对纸浆纤维素苄基化产物的分析表明:原料中的部分羟基被苄基取代,原有的结晶结构被破坏,产物热稳定性略有下降。维卡软化点和熔融温度测试显示产物的热塑性随取代度的增加而增加。本文还确定纸浆纤维素苄基化在4个不同温度下的反应速度常数,计算出纸浆苄基化反应的表观活化能为46.1kJ·mol-1。Wood and other plant raw materials could be converted to thermoplastic material by benzylation.Pulp cellulose was benzylated by using benzyl chloride as etherifying agent.Effects of reaction time and reaction temperature on degree of substitution（DS） of the products were studied.DS of the product increase under longer reaction time or higer reaction temperature.Products were characterized by FTIR,DSC,X-ray diffraction,etc.It showed some of hydroxyl of the products was substituted by benzyl,crystal was destroyed and thermal stability of the products descended slightly.Vicat softening point and melting temperature of the products were tested and the results revealed that thermoplasticization of the products improve with its DS.Rate constant of reaction of pulp cellulose benzylation under different reaction temperature was ascertained.Activation energy of cellulose benzylation was calculated,it was 46.1 kJ·mol-1.

关 键 词：纸浆 取代度 苄基化 动力学 热塑性 

分 类 号：TQ352[化学工程]