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首页> 美国政府科技报告 >Photogeneration of Reactive Amine Functionalities Within Polymers: Synthesis ofPhotoprecursor Copolymers and Their Use in Photocuring
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Photogeneration of Reactive Amine Functionalities Within Polymers: Synthesis ofPhotoprecursor Copolymers and Their Use in Photocuring

机译：聚合物中活性胺官能团的光生成：光敏共聚物的合成及其在光固化中的应用

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The chemistry of o-nitrobenzyl substituted alcohols and acids has led toimportant developments in protecting group chemistry as well as polymer curing and imaging. We have now developed a new family of amines protected with photolabile groups such as the o-nitrobenzyloxycarbonyl moiety. Reactive polymers containing protected amino groups were prepared by copolymerization of suitable monomers followed by chemical modification. In order to optimize the photodeprotection step, structurally analogous small molecule model compounds were also prepared. Irradiation of these model carbamates with UV light at 254 or 313 nm in the solid-state or in solution results in their clean deprotection to afford free amines. The reactive polymers selected for this study contained varying amount of the photoactive groups derived from p-aminostyrene with styrene or methyl methacrylate as the co-monomers. As expected, exposure of the copolymers to UV radiation below 400nm in solution or in the solid state led to the formation of polymers with free amine pendant groups. Quantum yield measurements confirmed that the photochemical deprotection was as effective with the polymers in the solid state as with the model compounds. The reactive copolymers were tested as curing agents for a variety of epoxy coatings.

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