The Effect of Generalized Parameters of a Dispersed Structure on Rheological Properties of Glass-Filled Polysulfone
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Effect of Generalized Parameters of a Dispersed Structure on Rheological Properties of Glass-Filled Polysulfone A. B. Baranova, * and I. D. Simonov-Emel’yanova aMoscow
Institute of Radio, Electronics and Automatics–Russian Technological University, Moscow, 119454 Russia *e-mail: [email protected] Received July 12, 2019; revised October 4, 2019; accepted November 20, 2019
Abstract—A classification of dispersed structures is presented for the polysulfone (PSF) + short glass fibers (GF) dispersed system, and their relationship with generalized parameter Θ and the content of dispersed filler is shown. A relationship is established between generalized structure parameter Θ and rheological properties of glass-filled PCMs based on PSF. It has been shown that the change in the parameters of the structure from a diluted to a medium-filled system leads to the formation of a quasi-continuous framework of dispersed particles at Θ = 0.45 parts by volume in dispersed-filled polymer composite materials (DFPCMs), while the viscosity of PSF-190 + GF melts increases by around three or four times in the processing temperature range from 290 to 340°C. It has been established that the introduction of glass fiber into PSF has practically no effect on the thermal stability time of polysulfone melts. Optimal temperature conditions for their processing into products by injection molding are proposed for DFPCMs based on PSF-190 + GF with different types of structures, viscosities, and thermal stability times. Keywords: thermoplastics, polysulfone, composite materials, rheological characteristics, thermal stability, generalized structure parameters DOI: 10.1134/S1995421220040036
INTRODUCTION Polysulfones (PSFs) make up a large group of heatresistant polyarylenes, which are polymeric materials for structural purposes. To improve the complex of physical and mechanical characteristics, short fibers with length l of more than critical length lcr are introduced into PSF, but this is accompanied by an increase in viscosity and a deterioration in the fluidity and processability of polymeric materials into products. The rheological behavior of dispersed-filled polymer composite materials (DFPCMs) is determined by their structure and its parameters, which are considered from the standpoint of the theory of constructing lattices and packings (the Shklovskii–De Genne model), as well as descriptions in terms of generalized parameters, when the polymer matrix is divided into three functional components in monolithic polymer dispersions. The aim of this work is to study the rheological properties of glass-filled polymeric materials based on PSF-190 with different structures, the compositions of which are calculated taking into account the lattice parameters, packings of dispersed particles, and generalized parameters according to the classification of DFPCMs on the basis of the structural principle. The objects of study were PSF-190 polysulfone (JSC Institute of Plastics) with molecular weight of
71000 g/mol, intrinsic viscosity of 0.46 dL/g, MFI = 8 g
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