A procedure for the determination of the contents and the thermal stability of associated structures in solutions of polymers is described, making use of the anomalous values and changes of integrated band intensities in high‐resolution 1 H‐NMR spectra. In this way, associated structures in solutions of isotactic and syndiotactic poly(methyl methacrylate), (PMMA), were detected and characterized. The associated structures in solutions of isotactic PMMA are much more stable than the aggregates in solutions of the syndiotactic PMMA. Two types of aggregates differring in stability were also observed in solutions of atactic poly(vinyl chloride).
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Spěváček et al. (1975) studied this question.
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