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The influence of different melt temperatures on the mechanical properties of injection moulded PA-12 and the post process detection by thermal analysis
journal contribution
posted on 2016-11-04, 10:00 authored by Tino Meyer, Andy HarlandAndy Harland, Barry Haworth, Chris E. Holmes, Tim Lucas, Paul SherrattPaul SherrattPolyamide 12 (PA-12) test plates were injection moulded using different melt temperatures and the influence on mechanical properties was investigated using quasi-static tensile and instrumented impact behaviour in two conditioned states: dried, and following accelerated moisture intake. Energy absorption in tension is strongly dependent on process temperature (variations up to 99 %) and additional variation (around 18%) was evident when testing at different conditioning states. Under high-velocity loading, the total impact energy varied by up to 8.70% and 9.05%, when systematic changes were made to process melt temperature and at moisture content, respectively, with all samples failing ductile. Differential Scanning Calorimetry (DSC) was used to characterise the unique endothermic melting behaviour of moulded PA-12 samples, by linking different process histories to the respective mechanical properties. With focus on the first heating curve progression, significant changes within the endothermic melting region were pointed out and quantified by using MatLab (software), proving DSC as a reliable testing tool for post-production analysis with increased practical implications regarding quality control as well as failure analysis. Findings for the initial heating curve progression were explained by studying the re-crystallisation peak values during cooling phase and obtained data for the second heating.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
International Polymer ProcessingVolume
32Issue
1Citation
MEYER, T. ... et al, 2017. The influence of different melt temperatures on the mechanical properties of injection moulded PA-12 and the post process detection by thermal analysis. International Polymer Processing, 32 (1), pp.90-101.Publisher
© Carl Hanser VerlagVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2016-06-28Publication date
2017-03-01Notes
This paper is closed access.ISSN
0930-777XeISSN
2195-8602Publisher version
Language
- en