摘要
本文系统开展了两种密度的聚苯醚(PPO)材料在γ辐射(0~1 kGy)和压缩(3%压缩率)耦合作用下的老化实验,研究了吸收剂量和压缩对PPO泡沫材料力学性能、热稳定性、导热性能、表面形貌及化学结构的影响,并利用气体红外光谱揭示了其辐射释放气体的种类及产量。结果表明,γ辐射-压缩耦合老化后PPO泡沫材料弹性模量和导热系数显著增加,样品表层孔结构的坍塌与永久变形是导致这一结果的关键;老化前后样品内部自由基类型和表面官能团结构均无明显变化,样品内部残余自由基浓度由辐射化学过程和吸收剂量所控制;PPO在O_(2)/N_(2)气氛下辐解产生CO_(2)、CO与烷烃,并且受永久变形影响,相对于单独γ辐射老化条件,PPO泡沫材料辐射-压缩老化后CO_(2)产量略微降低。研究结果对PPO泡沫材料γ辐射-压缩老化机理与服役寿命的评估具有重要意义。
This study examines the changes in properties and aging mechanisms of polyphenylene oxide(PPO)foams under two densities when subjected to combinedγ-radiation(0-1 kGy)and 3%compression.The investigation focuses on the effects of absorbed dose and compression on various characteristics,including the mechanical properties,thermal stability,thermal conductivity,surface morphology,and chemical structure of PPO foams.The types and yields of gases released during radiation exposure are revealed using gas-phase infrared spectroscopy.The results showed that the collapse and permanent deformation of the surface pore structure in PPO foams followingγradiation and compression aging significantly contribute to increase in elastic modulus and thermal conductivity.No significant changes were observed in the internal radicals or surface functional group structures of the samples before and after aging.The concentration of residual radicals within the samples was influenced by radiation-induced chemical changes and the absorbed dose.Upon radiation exposure and subsequent aging in an O_(2)/N_(2)atmosphere,PPO foams emited CO_(2),CO,and alkanes.In addition,the CO_(2)yield of PPO foams after radiation-compression aging was slightly reduced due to the permanent deformation caused by compression,compared toγ-radiation aging alone.These findings hold significant value for the evaluation ofγ-radiation-compression aging mechanisms and the lifespan of PPO foams.
作者
豆睿扬
张祎茜
金碧辉
黄玮
李光宪
龚鹏剑
雷雅杰
刘强
陈洪兵
DOU Ruiyang;ZHANG Yiqian;JIN Bihui;HUANG Wei;LI Guangxian;GONG Pengjian;LEI Yajie;LIU Qiang;CHEN Hongbing(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China;State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China;Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China)
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
2024年第6期126-136,共11页
Journal of Radiation Research and Radiation Processing
基金
国家自然科学基金(U2230202,52103131)
中国工程物理研究院院长基金(YZJJZQ2022005)。
关键词
聚苯醚泡沫
γ辐射-压缩耦合老化
力学性能
永久变形
辐解释气
老化机理
Polyphenylene oxide foams
γradiation-compression coupling
Mechanical properties
Permanent deformation
Radiolytic outgassings
Aging mechanism
