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Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight
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SYSNO ASEP 0532374 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight Tvůrce(i) Bucknall, C. (GB)
Altstädt, V. (DE)
Auhl, D. (DE)
Buckley, P. (GB)
Dijkstra, D. (DE)
Galeski, A. (PL)
Gögelein, C. (DE)
Handge, U. A. (DE)
He, J. (CN)
Liu, C.-Y. (CN)
Michler, G. (DE)
Piorkowska, E. (PL)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Vittorias, I. (CH)
Wu, J. J. (GB)Zdroj.dok. Pure and Applied Chemistry. - : Walter de Gruyter - ISSN 0033-4545
Roč. 92, č. 9 (2020), s. 1469-1483Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova high temperature creep ; intrinsic viscosity ; IUPAC Polymer Division Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science Způsob publikování Open access Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000574259400002 DOI 10.1515/pac-2019-0405 Anotace The aim of this project was to study the efficacy of current methods of quality control and quality assurance for ultra-high molecular weight polyethylene (UHMWPE) products, and find improvements where possible. Intrinsic viscosity (IV) tests were performed on three grades of polyethylene with weight average relative molar masses ̅Mw of about 6 × 105, 5.0 × 106 and 9.0 × 106. Results from three laboratories showed substantial scatter, probably because different methods were used to make and test solutions. Tensile tests were carried out to 600 % extension at 150 °C under both constant applied load and constant Hencky strain rate, on compression mouldings made by a leading manufacturer of ultra-high molecular weight polyethylene. They gave low values of ̅Mw, suggesting incomplete entanglement at ‘grain boundaries’ between powder particles. Results from conventional melt-rheology tests are presented, and their relevance to quality control and assurance is discussed. Attempts to calculate molecular weights from these data met with limited success because of extended relaxation times. Suggestions are made for improving international standards for IV testing of UHMWPE, by investigating the various factors that can cause significant errors, and by introducing methods for checking the homogeneity (and hence validity) of the solutions tested. Part 2 addresses characterization of crystallinity and structure. Part 3 covers mechanical properties, and Part 4 focuses on the sporadic crack propagation behaviour exhibited by all three grades of UHMWPE in fatigue tests on 10 mm thick compact tension specimens. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2021 Elektronická adresa https://www.degruyter.com/view/journals/pac/92/9/article-p1469.xml?tab_body=abstract
Počet záznamů: 1