Effect of the Gamma-Ray Irradiation on the Properties of an Epoxy Encapsulant

• Published in: Materials science forum Vol. 944; pp. 600 - 606
• Main Authors: Hu, Shou Liang, Xiang, Wei, Li, Yue Fang, Zeng, Zhi Bin, Liu, Xin, Xiao, Ming Zhu
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 01.01.2019
• Subjects: Chemical composition; Crosslinking; Dielectric properties; Discoloration; Dissipation factor; Encapsulation; Food irradiation; Fourier transforms; Gamma rays; Impact strength; Infrared analysis; Infrared spectra; Organic chemistry; Oxidation; Permittivity; Photoelectrons; Radiation dosage; Spectrum analysis; Thermal expansion; Gamma-Ray Irradiation; Epoxy; Dielectric Property
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.944.600

The influence of 60Co gamma-ray irradiation on the chemical compositions and properties of an epoxy encapsulant was investigated. The total irradiation dose varied from 0.1 kGy to 100 kGy with a fixed dose rate of 500 Gy/h. Fourier transform infrared spectra, X-ray photoelectron spectroscopy analysis and discoloration proved the occurrence of oxidation caused by the irradiation. Tg and density remained unchanged owing to the competing effects of irradiation-induced degradation and crosslinking. The tensile strength, impact strength and electrical strength did not decrease distinctly until the irradiation dose reached above 11 kGy. Rubbery coefficient of linear thermal expansion (CTE), relative permittivity and dissipation factor, on the contrary, were more sensitive to the oxidation and increased sharply when the irradiation dose was only 0.1 kGy. Our results suggested that the evolution of CTEs and dielectric properties could affect the long-term application and reliability of the epoxy encapsulant in the irradiative environment.