Random Copolymers Of Styrene Research Articles

Investigations on metallation and grafting of styrene-vinylnaphthalene copolymers

Random copolymers of styrene and vinylnaphthalene, prepared in solution, have been metallated in THF with Na, K and Cs. It has been shown that in this case no chain scission occurred during the metallation process. The metallated sites are able to initiate polymerization of cyclic monomers; graft copolymers with polyethylene oxide graftings have thus been obtained.

Block copolymerization of formaldehyde

AbstractSolubility and spectroscopic evidence are presented to support the formation of A‐B block copolymers between monomers undergoing anionic polymerization (A units) and monomeric formaldehyde (B units). Comonomers included in the study were styrene, methyl and n‐butyl methacrylate, acrylonitrile, isoprene, and N, N‐di‐n‐butylacrylamide. Similar evidence is presented on the formation of B‐A‐B copolymers between styrene and α‐methylstyrene and formaldehyde; an A‐(B‐C) random copolymer of styrene, formaldehyde, and phenyl isocyanate (C) was also prepared. Experimental details for the preparation of high‐purity, monomeric formaldehyde suitable for such work is described in some detail. It should be emphasized that this study was directed primarily toward showing the feasibility of preparing formaldehyde block copolymers; therefore, further work is needed to establish the quantitative nature of these reactions.