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首页> 美国卫生研究院文献>Molecules >Visible-Light-Curable Solvent-Free Acrylic Pressure-Sensitive Adhesives via Photoredox-Mediated Radical Polymerization
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Visible-Light-Curable Solvent-Free Acrylic Pressure-Sensitive Adhesives via Photoredox-Mediated Radical Polymerization

机译：可见光可溶剂无溶剂丙烯酸压敏粘合剂通过光针介导的自由基聚合

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摘要

Owing to their excellent properties, such as transparency, resistance to oxidation, and high adhesivity, acrylic pressure-sensitive adhesives (PSAs) are widely used. Recently, solvent-free acrylic PSAs, which are typically prepared via photopolymerization, have attracted increasing attention because of the current strict environmental regulations. UV light is commonly used as an excitation source for photopolymerization, whereas visible light, which is safer for humans, is rarely utilized. In this study, we prepared solvent-free acrylic PSAs via visible light-driven photoredox-mediated radical polymerization. Three α-haloesters were used as additives to overcome critical shortcomings, such as the previously reported low film curing rate and poor transparency observed during additive-free photocatalytic polymerization. The film curing rate was greatly increased in the presence of α-haloesters, which lowered the photocatalyst loadings and, hence, improved the film transparency. These results confirmed that our method could be widely used to prepare general-purpose solvent-free PSAs—in particular, optically clear adhesives for electronics.
机译：由于其优异的性能，例如透明度，耐氧化抗性，以及高粘合性，广泛使用丙烯酸敏感粘合剂（PSA）。最近，通常通过光聚合制备的无溶剂丙烯酸PSAS由于目前的严格的环境法规而引起了越来越多的关注。 UV光通常用作光聚合的激发源，而是对于人类更安全的可见光很少使用。在该研究中，我们通过可见光驱动的光针介导的自由基聚合制备无溶剂丙烯酸PSA。三个α-卤灭用作添加剂以克服关键缺点，例如先前报道的低膜固化率和在无添加光催化聚合期间观察到的透明度差。在α-卤络器存在下，薄膜固化率大大增加，从而降低了光催化剂载体，因此改善了薄膜透明度。这些结果证实，我们的方法可以广泛用于制备无溶剂的无溶剂 - 特别是光学透明的电子产品粘合剂。

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