Characteristics of IPN Adhesive Bonding of Polyether Imide to Titanium for Aerospace Application
Publication: Journal of Aerospace Engineering
Volume 30, Issue 4
Abstract
This investigation highlights the performance of epoxy-novolac interpenetrating polymer network (IPN) adhesive bonding of surface-modified polyether imide (PEI) to titanium (Ti) under elevated temperatures and an aggressive chemical environment as well as humid conditions. The results of physical and thermomechanical properties reveal that epoxy-novolac () IPN adhesive is the best combination. X-ray photoelectron spectroscopic (XPS) analysis demonstrates formation of oxide functional groups due to low-pressure plasma treatment onto the surface PEI and formation of oxide as well as nitride functional groups due to anodization and plasma nitriding on the titanium surfaces. Surface energy of the anodized titanium is relatively higher in comparison to plasma-nitrided titanium due to the high polarity of oxygen compared to nitrogen, and it consequently shows higher adhesive joint strength. Epoxy-novolac () IPN adhesive bonding of polyether imide to titanium reveals that anodized titanium to plasma-treated polyether imide adhesive joints show higher bond strength in ambient conditions. However, when exposed to an aggressive environment, the plasma-nitrided titanium to polyether imide adhesive joint shows higher bond strength because the nitride layer is more stable than the oxide layer and consequently results in a durable interface between titanium and adhesive, leading to cohesive failure of the adhesive joints.
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Acknowledgments
The authors hereby acknowledge the assistance from the CRNN (Mr. Samrat), Calcutta University, Kolkata, India, S. N. Bose National Centre for Basic Sciences (Mr. Surojit Mukherjee), Kolkata, India, and Amrita Institute of Medical Sciences (Mr. Sarath), Kochi Campas, Kerala, India for help by the way of providing facilities.
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Information & Authors
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Published In
Journal of Aerospace Engineering
Volume 30 • Issue 4 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 29, 2016
Accepted: Nov 22, 2016
Published ahead of print: Feb 22, 2017
Published online: Feb 23, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 23, 2017
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