Newly UV-curable polyurethane coatings prepared by multifunctional thiol- and ene-terminated polyurethane aqueous dispersions: Photopolymerization properties

被引：40

作者：

Yang, Zhenglong ^{[1
]}

Wicks, Douglas A. ^{[2
]}

Yuan, Junjie ^{[1
]}

Pu, Hongting ^{[1
]}

Liu, Yongsheng ^{[3
]}

机构：

[1] Tongji Univ, Coll Mat Sci & Engn, Inst Funct Polymer Mat, Key Lab Adv Civil Engn Mat, Shanghai 200092, Peoples R China

[2] Univ So Mississippi, Sch Polymers & High Performance Mat, Hattiesburg, MS 39406 USA

[3] Shanghai Univ Elect Power, Inst Solar Energy, Dept Math & Phys, Shanghai 200090, Peoples R China

来源：

POLYMER | 2010年 / 51卷 / 07期

基金：

中国国家自然科学基金;

关键词：

UV-curable coatings; Polyurethane dispersions; Thiol-ene chemistry; HYPERBRANCHED ALIPHATIC POLYESTER; MORPHOLOGY DEVELOPMENT; MECHANICAL-PROPERTIES; CHAIN EXTENSION; WATERBORNE; POLYMERIZATION; KINETICS; NEUTRALIZATION; MIXTURES; NETWORKS;

D O I：

10.1016/j.polymer.2010.02.003

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A novel approach toward the preparation of newly UV-curable polyurethane coatings composed of multifunctional thiol- and ene-terminated polyurethane aqueous dispersions is presented. By a synergistic combination of polyurethane dispersions synthesis and thiol-ene chemistry, strategies for the preparation of newly UV-curable polyurethane coatings are developed. Photo-DSC, real-time FTIR, DMA and tensile tests measurements are used to investigate the photopolymerization and mechanical behaviors of newly UV-curable polyurethane coatings. The newly polyurethane coatings have 1.5 times higher polymerization rate and final 99% functional groups conversion in air conditions compared to current urethane-acrylate based UV-curable polyurethane dispersions coatings. UV-cured polyurethane films prepared by this method are also found to exhibit increase in Young's modulus and tensile strength at break by 25% and 10%, respectively. These experiment facts suggest that the incorporation of thiol-ene chemistry to the polyurethane dispersion coatings increase their polymerization rate, producing a high degree of cross-linking. This confirms the preparation of the targeted novel UV-curable polyurethane coatings and reveals the dramatic effect that changes in incorporation of thiol-ene chemistry can have on the photopolymerization behaviors of UV-curable polyurethane dispersions coatings systems. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.

引用

页码：1572 / 1577

页数：6

共 32 条

[1] UV curable waterborne polyurethane acrylate dispersions based on hyperbranched aliphatic polyester: effect of molecular structure on physical and thermal properties [J].