Mechanism and kinetic regularities of crystallization of nanocomposites based on bentonite and polymer mixtures of random polypropylene with butadiene nitrile rubber

Abstract

The paper presents the results of a study of the dilatometric properties of thermoplastic elastomer nanocomposites based on mixtures of random polypropylene, nitrile butadiene rubber, a compatibilizer - copolymer of polypropylene with maleic anhydride. Nanosized bentonite particles were used as a filler. The concentration of bentonite nanoparticles was varied in the range of 1.0-20 wt %. The values of the free and occupied specific volumes of nanocomposites were determined depending on the temperature and concentration of bentonite. The mechanism and kinetic regularities of the crystallization process of nanocomposites are established.

Some problem questions in studying the properties of dynamically vulcanized polymer systems based on ethylene/1-hexene copolymer and nitrile butadiene rubber

“…In the previous work, 18 we showed the applicability of the Avrami theory for studying the crystallization process of polymer composite materials in the region of a first-order phase transition. According to this theory, the crystallization process proceeds in accordance with the empirical Kolmagorov-Avrami equation:where φ – the part of the polymer that has not yet undergone transformation into a crystalline phase; K – generalized constant of nucleation and crystal growth.…”

“…According to this theory, the crystallization process proceeds in accordance with the empirical Kolmagorov-Avrami equation:where φ – the part of the polymer that has not yet undergone transformation into a crystalline phase; K – generalized constant of nucleation and crystal growth. 18 The exponent n in this equation provides information about the mechanism of nucleation and crystal growth, τ is the crystallization time in the phase transition region.…”

“…In the previous work, 18 we showed the applicability of the Avrami theory for studying the crystallization process of polymer composite materials in the region of a first-order phase transition. According to this theory, the crystallization process proceeds in accordance with the empirical Kolmagorov-Avrami equation:…”

“…where φthe part of the polymer that has not yet undergone transformation into a crystalline phase; Kgeneralized constant of nucleation and crystal growth. 18 The exponent n in this equation provides information about the mechanism of nucleation and crystal growth, τ is the crystallization time in the phase transition region. The double logarithm of the Avrami equation allows us to obtain the following relationship:…”