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Thermal Initiators as Additives for Photopolymerization of Methacrylates upon Blue Light
Coatings ( IF 3.4 ) Pub Date : 2020-05-15 , DOI: 10.3390/coatings10050478
Aude-Héloise Bonardi , Soraya Zahouily , Céline Dietlin , Bernadette Graff , Frédéric Dumur , Malika Ibrahim-Ouali , Didier Gigmes , Jacques Lalevée

Free radical polymerization is often performed by thermal initiation but also more and more by light-assisted polymerization processes. This second approach allows the polymerization to be carried out under mild conditions (under air, upon blue light exposure, under low light intensity). The aim and the originality of the present paper is to perform photopolymerization in the presence of a thermal initiator, i.e., we can take advantage of the exothermicity of the photopolymerization process to decompose the thermal initiator, leading to enhanced polymerization rates. The performance of the photoinitiating system is discussed in the present study based on real-time Fourier-transform infrared spectroscopy measurements (following the C=C bond content evolution vs. time) and by thermal imaging experiments. Mechanisms of the new system proposed in this work are also fully detailed using cyclic voltammetry, electron spin resonance (ESR) spin trapping, and UV-visible absorption properties.

中文翻译:

热引发剂作为蓝光下甲基丙烯酸酯光聚合的添加剂

自由基聚合通常通过热引发进行,但越来越多地通过光辅助聚合过程进行。第二种方法允许聚合反应在温和的条件下(在空气中,在暴露于蓝光下,在低光强度下)进行。本文的目的和独创性是在热引发剂的存在下进行光聚合,即,我们可以利用光聚合过程的放热性来分解热引发剂,从而提高聚合速率。在本研究中,基于实时傅里叶变换红外光谱测量(遵循C = C键含量随时间的变化)和热成像实验,对光引发系统的性能进行了讨论。
更新日期:2020-05-15
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