title: Catalytic actions of alkaline salts in reactions between 1,2,3,4-butanetetracarboxylic acid and cellulose: II. Esterification.
abstract: 1,2,3,4-Butanetetracarboxylic acid (BTCA) reacts with cellulose in two steps with catalysis of alkaline salts such as sodium hypophosphite: anhydride formation and esterification of anhydride with cellulose. The alkali metal ions were found effective in catalyzing formation of BTCA anhydride in a previous report. In this work, catalytic functions of the alkaline salts in the esterification reaction between BTCA anhydride and cellulose were investigated. Results revealed that acid anions play an important role in the esterification reaction by assisting removal of protons on intermediates and completion of the esterification between cellulose and BTCA. Besides, alkaline salts with lower pKa1 values of the corresponding acids are more effective ones for the reaction since addition of these salts could lead to lower pH values and higher acid anion concentrations in finishing baths. The mechanism explains the results of FTIR and wrinkle recovery angles of the fabrics cured under different temperatures and times.
authors.affiliation: 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.
authors.forename: Bolin
authors.initials: B
authors.lastname: Ji
authors.affiliation: 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.
authors.forename: Peixin
authors.initials: P
authors.lastname: Tang
authors.affiliation: College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China; National Engineering Research Center for Dyeing and Finishing of Textiles, Donghua University, Shanghai 201620, PR China. Electronic address: klyan@dhu.edu.cn.
authors.forename: Kelu
authors.initials: K
authors.lastname: Yan
authors.affiliation: Division of Textiles and Clothing, University of California, Davis, CA 95616, USA. Electronic address: gysun@ucdavis.edu.
authors.forename: Gang
authors.initials: G
authors.lastname: Sun
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D002073:Butanes / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D003999:Dichloroacetic Acid / Q000737:chemistry; D004951:Esterification; D010721:Phosphinic Acids / Q000737:chemistry; D012492:Salts / Q000737:chemistry*
chemical_list: D000468:Alkalies; D002073:Butanes; D002264:Carboxylic Acids; D010721:Phosphinic Acids; D012492:Salts; C513573:1,2,3,4-butanetetracarboxylic acid; C009287:sodium hypophosphite; D002482:Cellulose; D003999:Dichloroacetic Acid
keywords: 1,2,3,4-Butanetetracarboxylic acid (PubChem CID: 15560); Acid anion; Alkaline salts; Catalytic mechanism; Dichloroacetic acid (PubChem CID: 6597); Esterification; Hydrochloric acid (PubChem CID: 313); Monosodium phosphate anhydrous (PubChem CID: 23672064); Phosphoric acid (PubChem CID: 1004); Pyrophosphoric acid (PubChem CID: 1023); Sodium hydroxide (PubChem CID: 14798); Sodium hypophosphite monohydrate (PubChem CID: 23708894); Sodium phosphite dibasic pentahydrate (PubChem CID: 16211071)