Experimental Characterization of Hygrothermal Aging: Competition Between Thermo-Oxidation and Hydrolysis Phenomena

Conference · Tue Jan 25 04:00:00 EST 2022 · Volume 12: Mechanics of Solids, Structures, and Fluids; Micro- and Nano- Systems Engineering and Packaging

DOI:https://doi.org/10.1115/imece2021-69891· OSTI ID:2328560

Shaafaey, Mamoon ^[1]; Bahrololoumi, Amir ^[2]; Alazhary, Sharif ^[2]; Mohammadi, Hamid ^[2]; Dargazany, Roozbeh ^[2]

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1. Michigan State University, East Lansing, Michigan, United States; Michigan State University
2. Michigan State University, East Lansing, Michigan, United States

Abstract In this work, we have presented a comparison between effects of accelerated thermo-oxidative, hydrolytic and hygrothermal aging on the mechanical and chemical properties of a polyurethane based (PUB) adhesive. The adhesive is a flexible adhesive which is extensively used in automobile industry as a glass sealant. During service life it gets exposed to the hygrothermal environment and the integrity of matrix interface is most vulnerable. This study focuses on weighing and comparing effects of different aging environments on material behavior; and it shows that hygrothermal aging environment results as a competition between two sub-aging phenomena i.e., thermo-oxidation and hydrolytic aging. Samples were exposed to 0%RH, 80%RH and submerged condition in distilled water. Uni-axial tensile tests, and cross-link density analysis by swelling test were carried out on as-received and aged samples. The aging process was conducted at three different temperatures (60°C, 80°C and 95°C) and for four different exposure durations of 1, 10, 30, and 90 days. This work confirms that the effect of hygrothermal aging is a result of competition between thermo-oxidation and hydrolytic aging environments. The total mechanical and environmental damage incurred by specimens is a collaborative effect of all exposure environments involved i.e., aging time, temperature, oxygen, water and humidity. The results are in agreement with the chemical test outcomes as well.

• Research Organization: Michigan State University
• Sponsoring Organization: USDOE
• DOE Contract Number: EE0008455
• OSTI ID: 2328560
• Conference Information: Journal Name: Volume 12: Mechanics of Solids, Structures, and Fluids; Micro- and Nano- Systems Engineering and Packaging
• Country of Publication: United States
• Language: English