Ultraviolet Irradiation Surface Treatment to Enhance the Bonding Strength of Polyamide-Based Carbon Fiber-Reinforced Thermoplastic Polymers

Adhesive bonding is a suitable joining method to satisfy the increasing industrial demand for carbon fiber-reinforced polymers without the need for a machining process. However, thermoplastic-based carbon fiber-reinforced polymers have small adhesive strength with structural thermoset adhesives. In...

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Bibliographic Details
Published in:Polymers 2024-10, Vol.16 (20), p.2864
Main Authors: Hwang, Mun Young, Yoon, Soon Ho, Kim, Minkook
Format: Article
Language:English
Subjects:
Adhesion
Adhesive bonding
Adhesive strength
Adhesives
Bond strength
Bonding strength
Carbon fiber reinforced plastics
Carbon fiber reinforcement
Carbon-epoxy composites
Chemical bonds
Cleavage
Composite materials
Curing
Energy
Epoxy adhesives
Epoxy resins
Fiber reinforced polymers
Functional groups
Heat treating
Irradiation
Lamps
Lasers
Machining
Mechanical properties
Oxidation
Plasma
Polyamide resins
Polyamides
Polymer industry
Polymers
Radiation
Shear strength
Shear tests
Surface treatment
Thermoplastics
Ultraviolet radiation
Wettability
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Summary:Adhesive bonding is a suitable joining method to satisfy the increasing industrial demand for carbon fiber-reinforced polymers without the need for a machining process. However, thermoplastic-based carbon fiber-reinforced polymers have small adhesive strength with structural thermoset adhesives. In this study, an ultraviolet irradiation surface treatment was developed to improve the adhesive bonding strength for polyamide-based carbon fiber-reinforced polymer. The type of ultraviolet wavelength, irradiation distance and irradiation time were optimized. Surface treatment with simultaneous UV irradiation of 185 nm and 254 nm wavelength generated unbound N-H stretching that was capable of chemical bonding with epoxy adhesives through a photo-scission reaction of the amide bond of polyamide matrix. Therefore, ultraviolet irradiation treatment improved the wettability and functional groups of the polyamide-based carbon fiber-reinforced polymers for adhesive bonding. As a result, the adhesive strength of the polyamide-based carbon fiber-reinforced polymers was increased by more than 230%.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16202864