Synthesis of vinyl functionalized polyurethane acrylate oligomers and their photopolymerization via thiol-ene click reaction

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2024-08-29 DOI:10.1016/j.porgcoat.2024.108752

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Abstract

Functional polyvinylethylene glycols (PVEGs) with different central structures were synthesized by Pd/B synergistic catalysts and reacted with isophorone diisocyanate (IPDI) and 2-hydroxyethyl methacrylate(HEMA) to prepared pendent vinyl-functional polyurethane acrylates (VFPUAs). The photopolymerization of the obtained VFPUAs with pentaerythritol tetra(3-mercaptopropionate) (PETMP) in the presence of a photoinitiator proceeded smoothly via thiol-ene photo-click reaction to give a series of crosslinked materials by the variation of the chemical structure of VFPUAs and a ratio of thiols and enes. The curing behavior was studied by FT-IR and the properties of crosslinked materials were characterized by the test of gel content, swelling ratio and water absorption. The dynamic mechanical properties, mechanical properties, thermogravimetry and surface properties of the crosslinked materials were investigated and the performance of coating for the crosslinked film materials was also characterized. The crosslinked film materials can be further functionalized by post-crosslinking modification through thiol-ene photo-click reaction.

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通过硫醇-烯点击反应合成乙烯基官能化聚氨酯丙烯酸酯低聚物及其光聚合反应

通过 Pd/B 协同催化剂合成了具有不同中心结构的功能性聚乙烯乙二醇 (PVEG)，并与异佛尔酮二异氰酸酯 (IPDI) 和甲基丙烯酸 2- 羟乙基酯 (HEMA) 反应制备了下垂乙烯基功能性聚氨酯丙烯酸酯 (VFPUAs)。通过改变 VFPUAs 的化学结构以及硫醇和烯的比例，得到的 VFPUAs 与季戊四醇四(3-巯基丙酸)（PETMP）在光引发剂存在下的光聚合反应通过硫醇-烯的光点击反应顺利进行，从而得到一系列交联材料。利用傅立叶变换红外光谱对固化行为进行了研究，并通过测试凝胶含量、膨胀率和吸水性对交联材料的性能进行了表征。研究了交联材料的动态力学性能、机械性能、热重和表面性能，并对交联薄膜材料的涂层性能进行了表征。交联薄膜材料可通过硫醇-烯光致键合反应进行后交联改性，从而进一步实现功能化。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.

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