Abstract
Stereocomplex formation between isotactic (iso-) poly(methyl methacrylate) (PMMA) and syndiotactic (syn-) polymers of methacrylates of straight-chain alcohols such as ethyl, propyl, butyl and allyl alcohols was found to occur in acetone to form gel. The solid complexes recovered from the gels in acetone showed endotherms in their DSC thermograms due to the melting of the complexes. The melting points of the complexes are 143.0°C, 125.4°C, 101.5°C and 141.5°C, respectively. The X-ray powder patterns of these complexes showed reflection peaks at 2Θ=4.3–4.4° and 6.8–10.6°. The former reflections are commonly observed for all stereocomplexes including PMMA stereocomplex and should correspond to the fiber period. The degree of the latter decreased as the size of ester group increased corresponding to the increasing distances between two double-stranded helices, if we adopt the Challa's double-stranded helical model for the stereocomplex.
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