Abstract The design and development of macro-photoinitiators applicable to UV system has been attracted increasing attention for their excellent performance of low migration and high compatibility. Herein, four kinds of novel macro-photoinitiators (PI1-PI4) used in UV-curable coatings were synthesized by different isocyanates, 1-hydroxycyclohexyl phenyl ketone (Irgacure 184), 2-hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PETA). The structures were analyzed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Moreover, the photopolymerization kinetics of the macro-photoinitiators were investigated by real-time FTIR. Results revealed that the macro-photoinitiators display higher curing efficiency, lower migration performance and better compatibility with formulation compositions compared to Irgacure 184. On the other hand, the macro-photoinitiators also served as self-initiating oligomers and had good thermal stability with 10 % weight loss temperatures (T10 %) above 299.7 °C. The UV-cured films consisting of oligomers and tripropylene glycol diacrylate (TPGDA) showed excellent physical properties and high curing efficiency and rapid curing rate.

中文翻译：

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新型紫外光固化宏观光引发剂的合成与光聚合

摘要 适用于紫外体系的宏观光引发剂的设计和开发以其低迁移和高相容性的优异性能受到越来越多的关注。在此，由不同的异氰酸酯、1-羟基环己基苯基酮（Irgacure 184）、甲基丙烯酸2-羟乙酯（HEMA）和季戊四醇三丙烯酸酯（PETA）合成了四种用于UV固化涂料的新型大分子光引发剂（PI1-PI4）。通过傅里叶变换红外光谱（FTIR）和核磁共振（NMR）分析结构。此外，通过实时 FTIR 研究了宏观光引发剂的光聚合动力学。结果表明，宏观光引发剂显示出更高的固化效率，与 Irgacure 184 相比，具有更低的迁移性能和更好的配方组合物相容性。另一方面，大分子光引发剂也可作为自引发低聚物并具有良好的热稳定性，10% 失重温度 (T10%) 高于 299.7 °C。由低聚物和三丙二醇二丙烯酸酯 (TPGDA) 组成的 UV 固化薄膜显示出优异的物理性能和高固化效率和快速固化速度。