Journal
POLYMER JOURNAL
Volume 52, Issue 9, Pages 1153-1163Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41428-020-0347-4
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We examined the differences between the resulting polymer structures in the cases of a coating and an adhesive employing the same formulation. The UV-curable coating yielded polymers terminated by either a hydroxyl group or a terminal carbonyl group as the main products, suggesting that bimolecular termination was strongly inhibited by oxygen. On the other hand, the UV-curable adhesive yielded a multitude of disproportionation products, whereas some polymers underwent hydrogen abstraction from the polymer backbone, resulting in beta-scission of the midchain radical to generate polymers with an alpha-substituted acryloyl group. Radical photopolymerization of acrylate was carried out without a degassing process under conditions suitable for UV-curable coatings and UV-curable adhesives. We examined the differences in the resulting polymer structures obtained from the coating and adhesive by employing the same formulation. 2,2-Dimethoxy-2-phenylacetophenone was employed as a photoinitiator. The UV-curable coating yielded polymers terminated by either a hydroxyl group or a terminal carbonyl group as the main products. On the other hand, the UV-curable adhesive yielded a multitude of polymers that were terminated by disproportionation. In the latter case, some polymers underwent hydrogen abstraction from the polymer backbone, resulting in beta-scission of the midchain radical to generate polymers with an alpha-substituted acryloyl group as the terminal group.
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