Journal of Radiation Research and Radiation Proces ›› 2016, Vol. 34 ›› Issue (6): 60401-60401.doi: 10.11889/j.1000-3436.2016.rrj.34.060401

• RADIATION TECHNOLOGY APPLICATION • Previous Articles     Next Articles

Improving the ceramics yield of polycarbosilane by γ-rays irradiation

CHENG Yong1,2, LI Xiaohu1,2, ZHOU Lulu1,2, XU Jiaqiang2, ZHANG Wenfa1, ZHANG Wenli1, LIU Weihua1, SHEN Rongfang1, WANG Mouhua1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. College of Science, Shanghai University, Shanghai 200444, China
  • Received:2016-08-11 Revised:2016-10-08 Online:2016-12-20 Published:2016-12-08
  • Supported by:

    Supported by the National Natural Science Foundation of China (11575279)

Abstract:

Polycarbosilane (PCS) was irradiated by γ-rays in N2 atmosphere. The chemical structure, molecular weight, thermal decomposition characteristics of the irradiated PCS were investigated by Fourier transform infrared spectroscopic analysis, gel permeation chromatographic analysis and thermogravimetric analysis, respectively. The results showed that a slight weight loss of PCS was found after γ-rays irradiation, both the molecular weight and softening point of PCS increased with the absorbed dose. These results indicated that crosslinking reactions occurred between PCS molecules induced by γ-rays irradiation. According to the results by Fourier transform infrared spectroscopic analysis, the crosslinking site of PCS was Si-C-Si structure which was formed by combining of Si-H with C-H structure. The ceramic yield of irradiated PCS increased significantly with its absorbed dose. When the absorbed dose reached 1.5 MGy, the ceramic yield increased from 61.9% of non-irradiated sample to a saturated value of 80.0%.

Key words: Polycarbosilane, γ-rays irradiation, Crosslinking, Ceramic yield

CLC Number: 

  • TQ174