关键词: 纤维素, 多元羧酸, 酯化反应, 交联反应, 次磷酸盐

Abstract: Polycarboxylic acids as esterification agent and inorganic salts as catalyst were used in the research of cellulose cross-linking reaction.This soluble cross-linking system is a poison-free and pollution-free system.The mechanism and effect of catalyst NaH₂PO₂ on esterification of cellulose by polycarboxylic acid were studied by FTIR spectra.Experimental results show that NaH₂PO₂ played catalysis role in both stages of esterification between cellulose and polycarboxylic acid,which are:1)The intermediate anhydrides of five-member-ring were formed by dehydration of polycarboxylic acids,during which the formation temperature was reduced by the catalyst;2)Esters were formed through nucleophilic substitution between the five-member-ring anhydride and cellulose during which,the conversion of esterificative products was enhanced by the catalyst.The catalysis effect of NaH₂PO₂ is remarkable.

Key words: cellulose, polycarboxylic acids, esterification, cross-linking reaction, NaH₂PO₂