Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures
By means of X-ray computed microtomography (XCMT), the existence of a developed porous structure with 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 (ab...
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2021
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oai:doaj.org-article:c90c31024cca4cc8af8f58baf80364862021-11-11T18:43:40ZStructure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures10.3390/polym132136782073-4360https://doaj.org/article/c90c31024cca4cc8af8f58baf80364862021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3678https://doaj.org/toc/2073-4360By means of X-ray computed microtomography (XCMT), the existence of a developed porous structure with 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 porous 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 the 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 pore system and to the ordering of the crystalline phase of PTFE.Alexander Sergeevich SmolyanskiiEkaterina Dmitrievna PolitovaOl’ga Alekseevna KoshkinaMikhail Aleksandrovich ArsentyevPavel Prokof’evich KuschLev Vladimirovich MoskvitinSergei Vital’evich SlesarenkoDmitrii Pavlovich KiryukhinLeonid Izrailevich TrakhtenbergMDPI AGarticlepolytetrafluoroethyleneionizing radiationhigh temperaturesmodificationcrystallizationcross-linkingOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3678, p 3678 (2021) |
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DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
polytetrafluoroethylene ionizing radiation high temperatures modification crystallization cross-linking Organic chemistry QD241-441 |
| spellingShingle |
polytetrafluoroethylene ionizing radiation high temperatures modification crystallization cross-linking Organic chemistry QD241-441 Alexander Sergeevich Smolyanskii Ekaterina Dmitrievna Politova Ol’ga Alekseevna Koshkina Mikhail Aleksandrovich Arsentyev Pavel Prokof’evich Kusch Lev Vladimirovich Moskvitin Sergei Vital’evich Slesarenko Dmitrii Pavlovich Kiryukhin Leonid Izrailevich Trakhtenberg Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| description |
By means of X-ray computed microtomography (XCMT), the existence of a developed porous structure with 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 porous 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 the 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 pore system and to the ordering of the crystalline phase of PTFE. |
| format |
article |
| author |
Alexander Sergeevich Smolyanskii Ekaterina Dmitrievna Politova Ol’ga Alekseevna Koshkina Mikhail Aleksandrovich Arsentyev Pavel Prokof’evich Kusch Lev Vladimirovich Moskvitin Sergei Vital’evich Slesarenko Dmitrii Pavlovich Kiryukhin Leonid Izrailevich Trakhtenberg |
| author_facet |
Alexander Sergeevich Smolyanskii Ekaterina Dmitrievna Politova Ol’ga Alekseevna Koshkina Mikhail Aleksandrovich Arsentyev Pavel Prokof’evich Kusch Lev Vladimirovich Moskvitin Sergei Vital’evich Slesarenko Dmitrii Pavlovich Kiryukhin Leonid Izrailevich Trakhtenberg |
| author_sort |
Alexander Sergeevich Smolyanskii |
| title |
Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| title_short |
Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| title_full |
Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| title_fullStr |
Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| title_full_unstemmed |
Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures |
| title_sort |
structure of polytetrafluoroethylene modified by the combined action of γ-radiation and high temperatures |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/c90c31024cca4cc8af8f58baf8036486 |
| work_keys_str_mv |
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