No abstract

As part of our• program on the synthesis of antiradiation drugs we set out to prepare two short-chain aminooxyalkanethiols, H2NO(CH2)"SH ( = 2 or 3). Pre-(1) Presented at the 148th National Meeting of the American Chemical Society, Chicago, 111., Sept. 1964.(2) This project was sponsored by the office of the Surgeon General, U. S. Army Medical Research and Development Command (Contract DA-49-193-M D-2047), whose generous support is gratefully acknowledged.

SynopsisAttempts to prepare block or graft copolymers of isobutylene rubbers by radiation in the presence of methyl methacrylate gave low yields of copolymer with only 20% of the rubber entering into the copolymer. The remainder of the rubber is degraded during the process. A single experiment describes the graft copolymerization of methyl methacrylate with ethylenepropykene rubber in which 45% of the rubber is copolymerized.

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.

Attempts to prepare block or graft copolymers of isobutylene rubbers by radiation in the presence of methyl methacrylate gave low yields of copolymer with only 20 per cent of the rubber entering into the copolymer. The remainder of the rubber is degraded during the process. A single experiment describes the graft copolymerization of methyl methacrylate with ethylene propylene rubber in which 45 per cent of the rubber is copolymerized.