Due to the rigid Si-O-Si backbone,silicone rubber(SR)have a widespread application in extreme en-vironment 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 physi-cal 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 compatibil-ity.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 y-irradiation,the radiation induced crosslinking and degradation mechanism of the nanocomposites was proposed comprehensively.

Mengni Shi;Yinyong Ao;Lei Yu;Lang Sheng;Shuangxiao Li;Jing Peng;Hongbing Chen;Wei Huang;Jiuqiang Li;Maolin Zhai

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;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China

中国化学快报（英文版）

[1]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].中国化学快报（英文版）,2022(07):3534-3538

ePOSS,compatibil,radiolysis

Epoxy,silicone,rubber,nanocomposites,excellent,thermal,stability,resistance,Due,rigid,Si,backbone,SR,have,widespread,application,extreme,such,temperature,level,However,still,does,not,meet,practical,needs,special,environments,Herein,prepared,epoxy,physi,crosslinking,point,addition,small,amount,only,enhanced,mechanical,properties,matrix,but,also,improved,its,greatly,due,their,good,had,higher,air,than,owing,inhibition,oxidation,by,yield,main,gaseous,products,CH4,H2,was,determined,By,analyzing,changes,chemical,structure,combined,characteristics,after,irradiation,induced,degradation,mechanism,proposed,comprehensively

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