二价阴离子催化剂对 1,2,3,4-丁烷四羧酸与纤维素交联的影响。
Effects of divalent anionic catalysts on cross-linking of cellulose with 1,2,3,4-butanetetracarboxylic acid.
机构信息
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China; Division of Textiles and Clothing, University of California, Davis, CA 95616, USA.
Division of Textiles and Clothing, University of California, Davis, CA 95616, USA.
出版信息
Carbohydr Polym. 2018 Feb 1;181:292-299. doi: 10.1016/j.carbpol.2017.10.081. Epub 2017 Oct 23.
1,2,3,4-Butanetetracarboxylic acid (BTCA) can efficiently esterify cellulose with pyrophosphoric acid (PPA) as a catalyst to remove protons of reaction intermediates. However, valence and relative concentration ratio (RCR) of catalyst anions correlating to pH of finishing bath played a critical role in the reactions. Results here indicated that wrinkle recovery angle, tensile strength retention and ester absorbance of fabrics treated at pH of 2.8 showed higher values. It was a competing reaction for BTCA molecules to esterify or depolymerize cellulose. Importantly, divalent PPA anions were more efficient than monovalent ones in catalyzing the esterification between anhydrides and cellulose, which was confirmed by FTIR results and two-dimensional correlation spectroscopy analyses and by the RCRs of PPA anions and their changing rates versus pH. Furthermore, the higher catalytic efficiency of divalent anions was proved by the selected model catalysts. Meaningfully, the fabrics treated at pH≤3.2 presented good durability.
1,2,3,4-丁烷四羧酸（BTCA）可以有效地与焦磷酸（PPA）酯化纤维素，以去除反应中间体的质子。然而，催化剂阴离子的价态和相对浓度比（RCR）与整理浴的 pH 值相关，对反应起着关键作用。结果表明，在 pH 值为 2.8 下处理的织物具有较高的折皱回复角、拉伸强度保持率和酯化吸光度。对于 BTCA 分子来说，酯化或纤维素解聚是一个竞争反应。重要的是，二价 PPA 阴离子比一价阴离子更有效地催化酸酐和纤维素之间的酯化反应，这通过傅里叶变换红外光谱（FTIR）结果和二维相关光谱分析以及 PPA 阴离子的 RCR 和其随 pH 值的变化率得到了证实。此外，通过选择的模型催化剂证明了二价阴离子的更高催化效率。有意义的是，在 pH 值≤3.2 下处理的织物具有良好的耐久性。
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