In the joint polymerization of butadiene and methacrylonitrile, the bulk of the polymer consists of macromolecules, in which the two unit components correctly alternate, and the butadiene combines in its 1,4-position. Only much fewer macromolecules are encountered in which several molecules of butadiene consecutively intercombine in 1,4-positions.

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Rubber Division, American Chemical Society, Inc.
1942
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