Features of forming the structure and properties of polyamide-6 via in situ polymerization with oxidized graphite
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ORIGINAL PAPER
Features of forming the structure and properties of polyamide-6 via in situ polymerization with oxidized graphite Dmitriy Leonov 1 & Tatiana Ustinova 2 & Natalia Levkina 2 & Anton Mostovoy 3
&
Marina Lopukhova 4
Received: 5 June 2020 / Accepted: 10 August 2020 # The Polymer Society, Taipei 2020
Abstract The paper presents the results of the study on the application of the method of polymerization combination of components. The possibility of the addition of oxidized graphite obtained by various oxidation methods into polyamide-6 at the stage of cationic polymerization of caprolactam has been studied. Its thermal expansion has been confirmed under the conditions of polymer synthesis. The effect of oxidized graphite on the formation of the structure of the modified polyamide has been shown. The improvement of the functional properties of polyamide-6 containing oxidized graphite has been proven: the volumetric electrical resistance decreases by more than 3 times, the coefficient of friction decreases by 40%, the coefficient of thermal conductivity increases by 35%. Keywords Polyamide-6 . Oxidized graphite . Polymerization combination of components . Functional properties . Physical and mechanical characteristics
Introduction Among industrial thermoplastics widely used for the production of composite materials for functional purposes, we should mention polyamide-6 which is characterized by good technological and operational characteristics, as well as wide areas of application of products based on it [1–16]. For the directed control of polyamide properties, modifying additives are added into polyamide compositions or the polymer is modified at the stage of its synthesis. The prospects for the method of combining components during polymerization are identified by ensuring uniform distribution of the modifier in the polymer matrix, creating highly filled composites already at
* Anton Mostovoy [email protected] Dmitriy Leonov [email protected] Tatiana Ustinova [email protected] Natalia Levkina [email protected] Marina Lopukhova [email protected]
the stage of the matrix polymer synthesis and, as a result, reducing the stages of the process and obtaining ready-toprocess composite materials [4, 7, 12–14]. Research in the field of polymer modification with functional additives is widely used to create polymer materials with a given set of consumer characteristics. There are various options for using carbon fillers to give polyamides new functional properties: –
modification of polyamide-6 with carbon nanotubes to achieve increased thermal stability of the resulting composites. The authors [1–3, 16] proved that the functionalization of carbon nanotubes ensures their
1
Laboratory “Support and Maintenance of the Educational Process”, Yuri Gagarin State Technical University of Saratov, Polytechnichskaya St., 77, Saratov, Russia
2
Department “Technologies and Equipment of Chemical, Oil and Gas and Food Production”, Yuri Gagarin State Technical University of Saratov, Polytechnich
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