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Structure, processing and performance of ultra-high molecular weight polyethylene (UHMWPE) (IUPAC Technical Report) (4 parts)

Veröffentlicht/Copyright: 1. Oktober 2020
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Chemistry International
Aus der Zeitschrift Chemistry International Band 42 Heft 4

Part 1: characterizing molecular weight

Part 2: crystallinity and supra molecular structure

Part 3: deformation, wear and fracture

Part 4: sporadic fatigue crack propagation

Clive Bucknall, Volker Altstädt, et al.

Pure and Applied Chemistry, 2020

published online ahead of print 24 Aug 2020

https://doi.org/10.1515/pac-2019-0405 (part 1); https://doi.org/10.1515/pac-2019-0403 (part 2); https://doi.org/10.1515/pac-2019-0406 (part 3); and https://doi.org/10.1515/pac-2019-0408 (part 4)

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 tests were performed on three grades of polyethylene with weight average relative molar masses of about 6x105, 5x106, and 9x106. 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 intrinsic viscosity 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 behavior exhibited by all three grades of UHMWPE in fatigue tests on 10 mm thick compact tension specimens.

https://iupac.org/project/2010-019-1-400

Online erschienen: 2020-10-01
Erschienen im Druck: 2020-10-01

©2020 IUPAC & De Gruyter. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. For more information, please visit: http://creativecommons.org/licenses/by-nc-nd/4.0/

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https://doi.org/10.1515/ci-2020-0424

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  5. Ten Chemical Innovations That Will Change Our World
  6. The Minamata Convention
  7. A Path for Tracking Funded Research and Compliance
  8. PAC Natural Products: A Story Six Decades in the Making
  9. IUPAC Wire
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  11. IUPAC Announces the 2020 Top Ten Emerging Technologies In Chemistry
  12. 2021 IUPAC-Solvay International Award for Young Chemists—Call for applicants
  13. 2021 Distinguished Women in Chemistry or Chemical Engineering Award—Call for nominations
  14. IIUPAC Awards in Analytical Chemistry—Call for nominations
  15. UMRS Survey on the Evolution of Scientific Publishing
  16. Open Science for a Global Transformation: CODATA-coordinated submission to the UNESCO Open Science Consultation
  17. The IUPAC Periodic Table Challenge available in multi-language
  18. Emeritus Fellows
  19. CI Green is back, online
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