In this article we describe the photo-initiated cyclopolymerization of 5-, 6- and 7-centre dienes. We find that substituted dienes can be cyclopolymerized in sunlight or by the use of a low-power UVA sunlamp of broad spectral range (320–400 nm). Unless activated by suitable electron withdrawing groups the cyclopolymerization can often be slow and incomplete. However, when suitably activated the polymerization rates can approach those for acrylates. In particular diallylamine, its quaternary salts, which can often be obtained as ionic fluids, and diallylamide, can be subjected to fairly rapid photocyclopolymerization to give robust coatings and adhesives. This discovery augments, and gives a different dimension, to the acrylate and methacrylate monomer and polymer systems that are already commercially available.
在这篇文章中,我们描述了 5-、6- 和 7-中心二烯的光引发环聚合反应。我们发现,取代的二烯可以在阳光下或使用光谱范围较宽(320-400 纳米)的低功率 UVA 太阳灯进行环聚合。除非被合适的电子撤回基团激活,否则环聚合反应通常会比较缓慢和不完全。不过,如果经过适当的活化,聚合速率可以接近
丙烯酸酯的聚合速率。特别是
二烯丙基胺、其季盐(通常可以
离子液体形式获得)和
二烯丙基酰胺,可以进行相当快速的光环聚合,从而获得坚固的涂层和粘合剂。这一发现增强了
丙烯酸酯和
甲基丙烯酸酯单体和聚合物系统的功能,并为其提供了一个不同的层面。