Photochemistry of polymeric systems. VI. Photocrosslinking of basic polymers and copolymers dyeing

Poly(N‐vinylamine) (PVAm) and methylmethacrylate/dimethylaminoethylmethacrylate copolymers (MMA/DMAEMA) were prepared and then substituted by cinnamic or cinnamylidene photosensitive groups. The photosensitivity of these materials was determined using the so‐called photoresist test in various experimental conditions. A comparison was made between MMA/DMAEMA and methylmethacrylate/4‐vinylpyridine (MMA/4VP) photosensitized copolymers. The best results were obtained with MMA/DMAEMA on textile support. A photosensitization study was carried out by adding some compounds such as thioxanthone (10% in bulk). It showed that the multiplicity factor can be 10 with MMA/DMAEMA copolymers and even up to 64 for photosensitive PVAm. The addition of anionic dyes on the polymers emphasized that a better fixation occured for aliphatic amines than for pyridinic ones.