Development of A New Type Aqueous-based Polyurethane: An Isocyanate-free Process

• Main Authors: Cheng-Wei Tsai, 蔡政衛
• Other Authors: 陳幹男
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/68016418778355576782

碩士 === 淡江大學 === 化學學系碩士班 === 96 === Bis(cyclic carbonate)s were prepared by the reaction of bis (epoxide) and atmospheric pressure of CO2 in the presence of Lithium Bromide as catalyst at 100℃ in high yield. Polymerization between bis(cyclic carbonate)s and four different kinds of diamine that were ethylenediamine, 1,12-diaminododecane, 1,4-butanediol bis(3-aminopropyl) ether ,and m-xylyenediamine in N,N-dimethylacetamide (DMAc) afforded corresponding poly( hydroxyurethane)s. The pendent hydroxyl groups of hydroxyl-PU were very reactive and could be easily modified from multifarious synthesis. In this report, half-esterification between these pendent hydroxyl groups of hydroxyl-PU and maleic anhydride could lead to new pendent groups, carboxylic groups. These highly polar carboxylic groups in the side chain of PU could play the role of internal emulsifier. They had self-dissociation ability in the water or were neutralized first by appropriate amount of base. Then, PU bearing carboxylic group could dispersed steadily in the water, named aqueous-based polyurethane dispersion. Addition of different ratios of bridging reagent TMPTA-AZ into above dispersion would lead to cross-linking net structure because of the reaction between carboxylic group and aziridine group of TMPTA-AZ. At last, Compare the properties of physics, thermal stability, dynamic mechanics between various PU film from different diamine and PU6331 with or without curing reagent TMPTA-AZ.