The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol  

作　　者：Peng Fei Yang Yan Hong Yu Shun Ping Wang Tian Duo Li 

机构地区：[1]Shandong Provincial Key Laboratory of Fine Chemicals,Shandong Polytechnic University,Jinan 250353,China [2]School of Business,Shandong Polytechnic University,Jinan 250353,China

出　　处：《Chinese Chemical Letters》2012年第2期241-244,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No20676074 and No21176147)

摘　　要：The urethane reaction of o-hydroxybenzyl alcohol with phenyl isocyanate was monitored with in situ FT-IR.Dibutyltin dilaurate was used as catalyst and its amount effect was investigated.It was found that there was an obvious induction period before reaction began.It was interesting that the time of induction period climbed up and then declined with the increase of dibutyltin dilaurate. When the concentration of dibutyltin dilaurate reached 9.58×10^（-5） mol/L,the induction period disappeared completely and hereafter did not appear any more.Furthermore,the urethane reaction kinetics was studied.When the concentration of dibutyltin dilaurate increased,the reaction rate of phenolic group（k_1） increased sharply,but the reaction rate of alcoholic group（k_2） appeared of little change on the whole.k_1 increased about 20-fold,yet k_2 increased about 2-fold when the concentration of dibutyltin dilaurate varied from 9.58×10^（-6） mol/L to 1.92×10~4 mol/L,which made the value of k_1/k_2 enlarge.The urethane reaction of o-hydroxybenzyl alcohol with phenyl isocyanate was monitored with in situ FT-IR.Dibutyltin dilaurate was used as catalyst and its amount effect was investigated.It was found that there was an obvious induction period before reaction began.It was interesting that the time of induction period climbed up and then declined with the increase of dibutyltin dilaurate. When the concentration of dibutyltin dilaurate reached 9.58×10^（-5） mol/L,the induction period disappeared completely and hereafter did not appear any more.Furthermore,the urethane reaction kinetics was studied.When the concentration of dibutyltin dilaurate increased,the reaction rate of phenolic group（k_1） increased sharply,but the reaction rate of alcoholic group（k_2） appeared of little change on the whole.k_1 increased about 20-fold,yet k_2 increased about 2-fold when the concentration of dibutyltin dilaurate varied from 9.58×10^（-6） mol/L to 1.92×10~4 mol/L,which made the value of k_1/k_2 enlarge.

关 键 词：Urethane reaction FT-IR Dibutyltin dilaurate Polymerization 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] O643.1[理学—物理化学]