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Synergistic effects of radiation and stress on mechanical properties organic composite materials

辐射和应力对有机复合材料力学性能的协同效应

基本信息

批准号：
06650780
负责人：
NISHIURA Tetsuya
金额：
$ 1.15万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

Mechanical tests (creep and relaxation tests by bending) are made during irradiation in order to examine synergistic effects of radiation and stress on mechanical properties.The 1994th period : 1.Samples are engineering plastics ie.epoxy resin and glass fiber reinforced epoxy resin. 2.Radiation sources are gamma-ray of Co-60 and electron beam of linac at ISIR.3.An alminum vessel for irradiation test was made, which was able to be filled with liquid nitrogen, in order to avoid thermal destruction of polymers by irradiation. 4.The material's degradation is found to be accelerated by snergestic effects of radiation and stress.The 1995th period. 5.Examining chmical processes in polymers of synergistic effects of radiation and stress, the dependency of the creep rates during irradiation on the enviromental temperature was investigated. The appearent activate energy for the rate in the synergistic test is smaller than that of the irrdiatet only material. The difference of degradation mechansm is, therefore, assumed btween the synergistic condition and the only irradiated condition.The 1996th period : 6.Radicals from ESR measurement in the synergistic test specimen are 10 % larger than those in the irrdiated one. 7.Scissions of molecular chain are found to be 10 % increased by synergistic effect according to vibrational tests and swelling tests. 8.The mechanism of acceleration in degradation of organic materials is proposed as followings ; 1) From macroscopic view point, decrease of the viscosity in Maxwell model. 2) Scissions increase and the effect of crosslinkage disappear in the synergistic condition.

在辐照过程中进行了力学试验（蠕变和弯曲松弛试验），以考察辐照和应力对力学性能的协同效应。1994年：1.试样为工程塑料，即环氧树脂和玻璃纤维增强环氧树脂。2.辐照源为Co-60的γ射线和ISIR直线加速器的电子束。3.为了避免辐照对聚合物的热破坏，制作了一个可充液氮的铝辐照试验容器。4.辐射和应力的吸收效应加速了材料的降解。5.通过考察辐射与应力协同作用下聚合物的化学过程，研究了辐照蠕变速率与环境温度的关系。协同试验中速率的表观活化能小于单掺材料的表观活化能。1996年第6期：ESR测定结果表明，协同条件下的自由基比单独辐照条件下的自由基大10%，协同条件下的自由基比单独辐照条件下的自由基大10%。7.通过振动实验和溶胀实验发现，协同效应使分子链的断裂增加了10%。8.从宏观上看，加速有机物降解的机理是：（1）从麦克斯韦模型来看，有机物降解的粘度降低。2)在协同作用下，剪切力增大，交联作用消失。