Aging characteristics of glass fiber‐reinforced polyamide in hot water and air

Polymer Composites - Tập 39 Số 4 - Trang 997-1005 - 2018
Klaus J. Geretschläger1, Gernot M. Wallner1
1Johannes Kepler University Linz, Institute of Polymeric Materials and Testing, Altenberger Strasse 69, Linz 4040, Austria

Tóm tắt

This article focuses on the accelerated aging behavior of a glass fiber‐reinforced and heat stabilized polyamide grade. Accelerated aging of injection molded specimens was achieved by hot air exposure (HAE) and pressure cooker testing (PCT) at elevated temperatures. For both aging routines, characteristic aging indicators were found. For hot air exposure, the carbonyl index obtained from infrared spectra revealed superficial thermo oxidation. For pressure cooker testing, the development of a regular crack pattern and successive surface roughening were observed by light microscopy and laser confocal microscopy. This was accompanied by a significant reduction in molar mass assessed by viscometry. In addition, progressing degradation of mechanical performance was ascertained by tensile testing experiments. At the onset of material cracking, the molar mass was about 25% of the initial value. POLYM. COMPOS., 39:997–1005, 2018. © 2016 Society of Plastics Engineers

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Polymer Composites

Tập 39 Số 4

997-1005

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