A study was made of the influence of the structure and ratio of the principal monomers, and also the microstructure of obtained block copolymers of (meth) acrylonitrile and (meth)acrylic acid, on the formation, in the process of heat treatment, of poly(meth)acrylimide foam materials.
The reactions of dicarboxylic acids with di-and triamines were studied, and the properties of the resulting polyamides were examinated in relation to the structure and ratio of the starting reactants.Among numerous polyamide derivatives [1, 2], a particular place is occupied by aliphatic polyimides prepared from dimerized fatty acid (DFA). The presense of a bulky alkylene segments between the carboxy groups of DFA makes the resulting polyamide considerably more elastic, decreases its softening point, and enhances its adhesion properties. This is important for preparing thermoplastic adhesive compounds [335].The possibility of using polyamides derived from DFA for preparing hot-melt adhesives was reported in [6 38]. However, the purposeful development of adhesive formulations with the preset physicomechanical properties was prevented by the lack of data on how the properties of the polyamides depend on the structure of the starting components. Therefore, it seemed important to study the synthesis of polyamides from DFA and to reveal the main parameters affecting the reaction course and the properties of the final product.The goals of this study were to optimize the synthesis conditions (so as to attain the maximal conversion of the reactants), examine how the properties of the resulting polyamides depend on the structure and ratio of the reactants, and optimize the process as a whole.
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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