Journal of Radiation Research and Radiation Processing ›› 2020, Vol. 38 ›› Issue (3): 10-20.doi: 10.11889/j.1000-3436.2020.rrj.38.030201

• RADIATION CHEMISTRY • Previous Articles    

γ-ray radiation effect on the properties of boron nitride/epoxy composites

ZHU Wengang1,JIANG Zhiwen1,CHEN Hongbing2,HUANG Wei2,WANG Mozhen1(),GE Xuewu1(),LIN Mingzhang3   

  1. 1.CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
    2.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
    3.Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2020-01-17 Revised:2020-02-28 Accepted:2020-02-28 Online:2020-06-20 Published:2020-06-18
  • Contact: WANG Mozhen,GE Xuewu E-mail:pstwmz@ustc.edu.cn;xwge@ustc.edu.cn
  • About author:ZHU Wengang (male)was born in December 1995, and obtained his bachelor’s degree from Shandong University in June 2017. Now he is a graduate student at University of Science and Technology of China, majoring in material processing engineering
  • Supported by:
    Science Challenge Project(TZ2018004);National Natural Science Foundation of China(51773189)

Abstract:

Epoxy resin and its composites are widely utilized in the nuclear industry. In this work, epoxy composites were prepared by blending hexagonal boron nitride (h-BN) powder with tetrahydrophthalic acid diglycidyl ester, methyltetrahydrophthalic anhydride (curing agent), and 2,4,6-tris (dimethylaminomethyl) phenol (catalyst), followed by a thermal-curing process. The structure and properties (such as thermal stability, mechanical properties, and thermal conductivity) of the prepared h-BN/epoxy (h-BN/EP) composites were investigated before and after irradiation using 60Co γ-ray under an air or nitrogen atmosphere at a certain absorbed dose rate (60 Gy/min). The results showed that h-BN powder had good structural stability under γ-ray radiation at absorbed doses up to 380 kGy. However, the glass transition and initial thermal decomposition temperatures of the h-BN/EP composites were significantly lower than those of the pure EP matrix after γ-ray radiation. The effect of γ-ray radiation on the mechanical properties of h-BN/EP composites depends on both the h-BN content and the absorbed dose. For the composite with a low h-BN content (mass fraction<0.52%), the tensile strength decreased remarkably even after the composite was irradiated by γ-ray at a low absorbed dose (≤180 kGy). In contrast, for the composite with a higher h-BN content (mass fraction≥0.52%), the tensile strength increased significantly after the γ-ray radiation at the same absorbed dose. When the absorbed dose was 1 000 kGy, the tensile strengths of the irradiated pure EP and all irradiated h-BN/EP composites were the same, i.e., they had no relationship with the h-BN content. These results indicate that the thermal conductivity of the h-BN/EP composites will be greatly improved after γ-ray radiation at the absorbed dose of 180 kGy.

Key words: Hexagonal boron nitride, Epoxy resin, γ-ray radiation, Thermal stability, Mechanical property, Thermal conductivity

CLC Number: 

  • TL13