| 的催化作用 |
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| 引用本文： | 方桂珍.的催化作用[J].林产化学与工业,2004,24(2):43-46. |
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| 作者姓名： | 方桂珍 |
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| 作者单位： | 东北林业大学,材料科学与工程学院,黑龙江,哈尔滨,150040 |
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| 基金项目： | 国家自然科学基金资助项目(39910594) |
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| 摘 要： | 采用以多元羧酸为酯化剂，无机盐为催化剂的交联体系。这一体系是水溶的、无毒害的纤维素交联反应的非甲醛系试剂的交联体系。作者采用傅立叶转换红外光谱(ITIR)分析了多元羧酸与纤维素交联反应过程中催化剂次磷酸盐(NaH2PO2)的作用机理。结果表明：催化剂NaH2PO2对多元羧酸与纤维素酯化反应的两个过程都有催化作用，其两个过程为：1)多元羧酸脱水形成五元环酸酐中间体，NaH2PO2可以降低五元环酸酐中间体形成的温度，加速五元环酸酐的形成；2)五元环酸酐与纤维素亲核取代形成酯，NaH2PO2提高了酯化产物转化率，具有明显的催化作用。
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| 关 键 词： | 纤维素 多元羧酸 酯化反应 交联反应 次磷酸盐 |
| 文章编号： | 0253-2417(2004)02-0043-04 |
CATALYTIC EFFECT OF NaH2PO2 IN ESTERIFICATION OF CELLULOSE BY POLYCARBOXYLIC ACID |
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| FANG Gui-zhen.CATALYTIC EFFECT OF NaH2PO2 IN ESTERIFICATION OF CELLULOSE BY POLYCARBOXYLIC ACID[J].Chemistry & Industry of Forest Products,2004,24(2):43-46. |
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| Authors: | FANG Gui-zhen |
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| 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 NaH_2PO_2 on esterification of cellulose by polycarboxylic acid were studied by FTIR spectra.Experimental results show that NaH_2PO_2 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 NaH_2PO_2 is remarkable. |
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| Keywords: | cellulose polycarboxylic acids esterification cross-linking reaction NaH_2PO_2 |
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