Citation: Mengni Shi, Yinyong Ao, Lei Yu, Lang Sheng, Shuangxiao Li, Jing Peng, Hongbing Chen, Wei Huang, Jiuqiang Li, Maolin Zhai. Epoxy-POSS/silicone rubber nanocomposites with excellent thermal stability and radiation resistance[J]. Chinese Chemical Letters, ;2022, 33(7): 3534-3538. doi: 10.1016/j.cclet.2022.03.068 shu

Epoxy-POSS/silicone rubber nanocomposites with excellent thermal stability and radiation resistance

Mengni Shi ^{a, 1} ,
Yinyong Ao ^{b, 1} ,
Lei Yu ^b ,
Lang Sheng ^a ,
Shuangxiao Li ^a ,
Jing Peng ^a ,
Hongbing Chen ^b ,
Wei Huang ^b ,
Jiuqiang Li ^a ,
Maolin Zhai ^{a, *,}

a.
Beijing National Laboratory for Molecular Sciences, Radio Chemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
b.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

mlzhai@pku.edu.cn

Received Date: 26 November 2021
Revised Date: 15 March 2022
Accepted Date: 15 March 2022
Available Online: 18 March 2022

Figures(6)

Due to the rigid Si-O-Si backbone, silicone rubber (SR) have a widespread application in extreme environment such as high temperature and high-level radiation. However, the radiation stability of SR still does not meet the practical needs in special radiation environments. Herein we prepared epoxy POSS(ePOSS)/SR nanocomposites with excellent thermal stability and radiation resistance. As a physical crosslinking point in the SR, addition of small amount of ePOSS not only enhanced the mechanical properties of the matrix, but also improved its thermal stability greatly due to their good compatibility. ePOSS/SR had higher radiation stability in air than SR owing to the inhibition of radiation oxidation by ePOSS, and the yield of main gaseous radiolysis products (CH₄, H₂, CO and CO₂) of SR and ePOSS/SR nanocomposites was determined. By analyzing the changes of chemical structure, thermal properties and mechanical properties of the ePOSS/SR nanocomposite, combined with the characteristics of gas products after γ-irradiation, the radiation induced crosslinking and degradation mechanism of the nanocomposites was proposed comprehensively.
- POSS,
- Silicone rubber,
- Thermal stability,
- Radiation resistance,
- Radiation crosslinking and degradation mechanism
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