Add time:07/19/2019         Source:sciencedirect.com

Polymers bearing N-arylamide units in the side-chains were synthesized by the radical polymerization of N-phenylmethacrylamide (PhMA) and its homologues; the photocrosslinking behaviour of the polymers was studied. When the polymers were irradiated with u.v. light, they became insoluble. The substituents on the phenyl ring of PhMA units and the glass transition temperatures of the polymers strongly affected the efficiency of the photocrosslinking. It was found that the 2′- and 4′-aminoacetophenone moieties, formed by the photo-Fries rearrangements of PhMA units, participated in the photocrosslinking; 4′-aminoacetophenone moieties were more important than 2′-aminoacetophenone moieties for the photocrosslinking. A reaction mechanism is discussed.

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