Summary
4-Urazoyl benzoic acid groups 1 are attached as terminal end group to an oligoisobutene. According to wide-angle X-ray scattering the material is amorphous. Differential scanning calorimetry, small-angle X-ray scattering, transmission electron microscopy, and polarizing microscopy show that the polar head groups form ordered two-dimensional assemblies which organize into spherulites. Temperature-dependent SAXS measurements and the d.s.c. analysis give a close insight into the order-disorder (“melting”) process of the two-dimensional clusters which form macroscopic spherulites. The order-disorder transition of the clusters is closely related to the dynamics and order of the polyisobutene chain.
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Dedicated to the memory of Ingrid Hoffmann (died 12. 6. 1993)
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Schirle, M., Hoffmann, I., Pieper, T. et al. Spherulite formation in a “noncrystalline” two-dimensional hydrogen-bond assembly. Polymer Bulletin 36, 95–102 (1996). https://doi.org/10.1007/BF00296013
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DOI: https://doi.org/10.1007/BF00296013