Abstract
LIQUORI1,2 showed the occurrence of a possible “stereocomplex” in dissolved mixtures of iso and syndiotactic polymethylmethacrylate (PMMA) in a ratio of 1/2 i/s PMMA and, on the basis of X-ray diffraction on the solid mixtures, suggested its possible structure1. After Liquori's first publication in 1965, we supposed that such a stereocomplex could also be shown by viscosity, light-scattering and refractive index measurements of solutions of isomer mixtures and by infrared spectral analysis of solid mixtures. The syntheses of the iso and syndiotactic3,4 isomers (I and S) are described in ref. 5. The molecular weights and nuclear magnetic resonance tacticities are given in Table 1. The preparation of the solutions is described in ref. 5. Chloroform is used as solvent.
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References
Liquori, A. M., et al., Nature, 206, 358 (1965).
Liquori, A. M., et al., J. Polymer Sci., 4B, 943 (1966).
Goode, W. E., et al., J. Polymer Sci., 46, 317 (1960).
Belgium Pat. No. 566,713 (1958).
van den Berg, W. B., thesis, Eindhoven (1967).
Braun, D., et al., Makromol. Chem., 51, 15 (1961).
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VAN DEN BERG, W., HIJMANS, B., PIET, P. et al. Complex Formations between Iso and Syndiotactic Polymethylmethacrylate in Solutions. Nature 217, 949 (1968). https://doi.org/10.1038/217949a0
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DOI: https://doi.org/10.1038/217949a0
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