Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Structure of polytetrafluoroethylene modified by the combined action of γ-radiation and high temperatures

Version 1 : Received: 17 September 2021 / Approved: 20 September 2021 / Online: 20 September 2021 (16:58:23 CEST)

A peer-reviewed article of this Preprint also exists.

Smolyanskii, A.S.; Politova, E.D.; Koshkina, O.A.; Arsentyev, M.A.; Kusch, P.P.; Moskvitin, L.V.; Slesarenko, S.V.; Kiryukhin, D.P.; Trakhtenberg, L.I. Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures. Polymers 2021, 13, 3678. Smolyanskii, A.S.; Politova, E.D.; Koshkina, O.A.; Arsentyev, M.A.; Kusch, P.P.; Moskvitin, L.V.; Slesarenko, S.V.; Kiryukhin, D.P.; Trakhtenberg, L.I. Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures. Polymers 2021, 13, 3678.

Journal reference: Polymers 2021, 13, 3678
DOI: 10.3390/polym13213678

Abstract

By means of X-ray computed microtomography (XCMT) the existence of a developed microporous structure having an average pore diameter of ~3.5 μm and pore content of ~1.1 vol.% has been revealed in unirradiated polytetrafluoroethylene (PTFE). It has been found that the combined action of gamma radiation (absorbed dose per PTFE of ~170 kGy) and high temperatures (327-350 °C) leads to the disappearance of the microporous structure and the formation of several large pores with sizes from 30 to 50 μm in the bulk of thermal-radiation modified PTFE (TRM-PTFE). It has been established by X-ray diffraction (XRD) analysis that the thermal-radiation modification of PTFE leads to an increase in the interplanar spacings, the degree of crystallinity and volume of the unit cell, as well as to a decrease in the size of crystals and the X-ray density of the crystalline phase in comparison with the initial polymer. It is assumed that the previously established effect of improving the deformation-strength and tribological properties of the TRM-PTFE can be due not only to the radiation cross-linking of polymer chains but also to the disappearance of the micropore system and to the ordering of the crystalline phase of PTFE.

Keywords

PolyTetraFluoroEthylene; Ionizing radiation; , High temperatures; Modification; Crystallization; Cross-linking; Pore; Structure

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