质子辐照引起的质量损失模型及实验验证
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摘要
聚合物材料在质子辐照环境中因发生出气逸出行为可造成分子污染。根据质子辐照聚合物材料过程中的假设条件,基于扩散理论建立质子辐照质量损失数学模型。借助分离变量法,获得质量损失与各影响因素的函数关系式。在高能质子模拟环境中进行了聚酰亚胺薄膜辐照实验,测试了辐照后聚酰亚胺材料的质量损失。对比研究了模拟值与实验值间的误差,最终得到了质子辐照聚酰亚胺引起的质量损失与辐照时间的函数关系式。研究结果表明,建立的质量损失数学模型与实验数据间的最大误差为-5.8%,数学模型可满足一般工程设计的需要,并可为筛选空间材料提供理论依据。
Outgassing of polymer materials induced by proton radiation can cause the molecular contamination.According to the hypothesis occurring in the proton radiation process on polymer materials,based on the diffusion theory,simulation of mass loss induced by proton radiation for polymer materials was researched.The mathematical function between mass of volatile in the material and radiation time was obtained using the variable separation approach.Mass loss for the polyimide( PI) film obtained from experiments and parameters in the model was calculated through curve fitting in order to validate the applicability of the model.The results showed that the maximum error between the model of mass loss and experiment was-5.8% and the model of mass loss was applicable to PI film and can be used for prediction on mass loss of polymer materials induced by proton radiation.
Outgassing of polymer materials induced by proton radiation can cause the molecular contamination.According to the hypothesis occurring in the proton radiation process on polymer materials,based on the diffusion theory,simulation of mass loss induced by proton radiation for polymer materials was researched.The mathematical function between mass of volatile in the material and radiation time was obtained using the variable separation approach.Mass loss for the polyimide( PI) film obtained from experiments and parameters in the model was calculated through curve fitting in order to validate the applicability of the model.The results showed that the maximum error between the model of mass loss and experiment was-5.8% and the model of mass loss was applicable to PI film and can be used for prediction on mass loss of polymer materials induced by proton radiation.
引文
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