Some cases of isomerism in high polymers prepared from pairs of different monomers are reviewed in relation to the more difficult problems of isomerism in vinyl polymers prepared from a single monomer.Branching, head-to-tail against head-to-head addition, and several types of spatial isomerism are discussed.Evidence is presented of spatial isomerism in polyvinyl isobutyl ethers and polyvinyl methyl ethers obtained under widely different conditions of polymerization. Differences in d
T h e literature related to simple urlsubstituted F i n y l allq 1 ethers is reviewed. New data are presented on the purification and properties of the vinyl alkyl ether monomers. Special attention is given to vinyl methyl, vinyl n-butJ 1, and vinyl isobutyl ethers, which have been made available for dekelopment purposes in this country by application o f the Reppe synthesis. Correct physical data on these materials are of special interest both because, the monomers are com-HIS paper discusses simple compounds of the type T CH2=CHOR, where R is an alkyl group free from unsaturation and both the vinyl and R groups are free from halogen or other substitution. Vinyl methyl ether, vinyl n-butyl ether, and vinyl isobutyl ether are the members of the series which received most attention and whose polymers are discussed.The nex data presented from this laboratory comprise the major part of the material under the headings Purification, Physical Properties, and Polymerization, as well as Properties and Stabilization of the Polymers. B large part of the information on
Vinyl isobutyl ether is shown to give different types of high polymers depending on the conditions of polymerization.The polymer obtained by rapid polymerization with boron fluoride catalyst is substantially amorphous and rubberlike.A second type of polymer is less rubberlike, comparatively well ordered and gives an x-ray fiber
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