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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 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 1: characterizing molecular weight Author(s) 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)Source Title Pure and Applied Chemistry. - : Walter de Gruyter - ISSN 0033-4545
Roč. 92, č. 9 (2020), s. 1469-1483Number of pages 15 s. Language eng - English Country DE - Germany Keywords high temperature creep ; intrinsic viscosity ; IUPAC Polymer Division Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000574259400002 DOI 10.1515/pac-2019-0405 Annotation 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://www.degruyter.com/view/journals/pac/92/9/article-p1469.xml?tab_body=abstract
Number of the records: 1