The methods of differential thermal and thermogravimetric analysis using electron scanning microscopy were used to study the stability of a “polymethacrylic acid–polyethylene glycol” interpolymer complex in the process of synthesis. It was shown that, during drying of the polycomplex, uncontrolled heat generation is possible, resulting from the crystallisation of excess polyethylene glycol and the aggregation of polycomplex particles in the absence of moisture owing to change in the nature of the autohesion interaction of particles.
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