The polyacroleins were prepared anionically in the presence of a sensitizor containing carbonyl groups and irradiated in solution with a mercury vapor lamp. The polymers obtained after various polymerizing times were completely insoluble in organic solvents. Different factors affecting gelation speed were studied. New acrolein graft copolymers prepared from a polycarbanionic polymer are also described. These new copolymers are also crosslinked by light and their use as a photosensitive layer is described.
Several independent studies confirm that anionic polyacroleins are block polymers. Chemical analysis, thermogravimetric studies, and variations of the refractive index increment and sequences lengths all support this hypothesis.
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