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Published in: Journal of Coatings Technology and Research 6/2021

17-08-2021

Polyimide–polyester hybrid UV-curable powder coating

Authors: Hamideh M. Shokouhi Mehr, Theodore J. Hammer, Mark D. Soucek

Published in: Journal of Coatings Technology and Research | Issue 6/2021

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Abstract

A new UV-curable maleimide-terminated polyimide was prepared and characterized using gel-permeation chromatography, infrared, and nuclear magnetic resonance spectroscopy. The polyimide was formulated with a commercially available UV-curable polyester resin via twin-screw extrusion to prepare a hybrid powder coating system. The hybrid powder coatings were cured by exposing the molten formulation to UV light. The films were studied by dynamic mechanical analysis (DMA), thermomechanical analysis, and differential scanning calorimetry. DMA highlighted the viscoelastic behavior of the films and showed that an increase in Tg was obtained with increasing polyimide content, as determined via the α-transition in the tanδ curve. Thermogravimetric analysis showed an improvement in the thermal stability of the polyester with the addition of the polyimide. Deformation resistance of the UV-cured films was investigated by SAOS and LAOS rheological methods to investigate the relative endurance of these coatings when subjected to different strains. The viscoelastic properties of the hybrid system were most improved when 16% weight percent of polyimide was added into the system.

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Appendix
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Metadata
Title
Polyimide–polyester hybrid UV-curable powder coating
Authors
Hamideh M. Shokouhi Mehr
Theodore J. Hammer
Mark D. Soucek
Publication date
17-08-2021
Publisher
Springer US
Published in
Journal of Coatings Technology and Research / Issue 6/2021
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-021-00470-4

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