SynopsisClear sheets of polyacrylonitrile are prepared by casting under conditions whereby an adequate supply of monomer is available to the polymerizing mass and process variables are closely controlled. This surprising behavior can be extended to some copolymers of acrylonitrile and to certain other vinyl compounds that polymerize by precipitation of polymer.
SynopsisPolyacrylonitrile sheet cast by a novel method described in Part I is clear, colorless, chemically resistant, brittle, and rather weak. It, undergoes irreversible thermal changes above about 80°C., biit if heated quickly, it can be oriented to give greater strength parallel to the direction of orientation. Some improvement in strength can be achieved by the nse of fibrons fillers. Certain copolymers are stronger thaii the homopolymer but have lower softening temperatureh.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.