Abstract
Abstracttert‐Butyl thiolacrylate was readily polymerized by various anionic catalysts to give crystalline polymers. The polymers formed were markedly different from each other in elasticity according to the nature of the catalyst used. The elasticity continuously decreased in the following order of catalysts: LiAlEt3Bu, CaZnEt4, n‐BuLi, SrZnEt4 and PhMgBr. The crystalline polymer prepared by phenylmagnesium bromide was resinous in contrast to the elastic polymer formed by lithium aluminum tetraalkyl catalyst. Gradual change in the DEBYE‐SCHERRER's rings as well as the infrared spectra of these crystalline polymers was also observed in the above order. It was suggested that these crystalline polymers were probably stereoblock copolymers or polymer blends consisting of two stereo‐components, the proportion of which changed continuously according to the mentioned order.
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