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γ辐射对氮化硼/环氧树脂复合材料性能的影响 被引量:9

γ-ray radiation effect on the properties of boron nitride/epoxy composites
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摘要 环氧树脂及其复合材料具有良好的电气绝缘性能,在核工业领域得到了广泛应用。本工作将六方氮化硼粉末(h-BN)与四氢邻苯二甲酸二缩水甘油酯、固化剂甲基四氢邻苯二甲酸酐和促进剂2,4,6-三(二甲氨基甲基)苯酚共混,并热固化成型,制备了氮化硼/环氧树脂(h-BN/EP)复合材料。在空气和通氮限氧气氛及一定吸收剂量率下(60 Gy/min),研究了h-BN粉末和h-BN/EP复合材料经60Coγ射线辐照后结构和性能(力学性能、导热性能和热稳定性等)的变化情况。结果表明,两种气氛中,h-BN粉末都具有良好的γ射线辐照稳定性,吸收剂量达到380 kGy时,化学结构和热稳定性均未发生变化。但h-BN/EP复合材料经γ射线辐照后,玻璃化转变温度和初始热分解温度的下降程度都较纯EP基体明显。γ射线辐照对复合材料力学性能的影响与h-BN含量和吸收剂量相关。对于低h-BN含量(质量分数<0.52%)的复合材料,其拉伸强度在吸收剂量较低(≤180 kGy)时即显著下降;而高h-BN含量(质量分数≥0.52%)的复合材料,其拉伸强度在较低剂量(≤180 kGy)时反而明显上升。当吸收剂量达1000 kGy时,辐照后不同h-BN含量的复合材料以及纯EP的拉伸强度基本为同一水平,即吸收剂量高于1000 kGy时,添加h-BN对EP的拉伸强度基本无影响。当吸收剂量为180 kGy时,γ射线辐射使得h-BN/EP复合材料的导热系数显著增加。 Epoxy resin and its composites are widely utilized in the nuclear industry.In this work,epoxy composites were prepared by blending hexagonal boron nitride(h-BN)powder with tetrahydrophthalic acid diglycidyl ester,methyltetrahydrophthalic anhydride(curing agent),and 2,4,6-tris(dimethylaminomethyl)phenol(catalyst),followed by a thermal-curing process.The structure and properties(such as thermal stability,mechanical properties,and thermal conductivity)of the prepared h-BN/epoxy(h-BN/EP)composites were investigated before and after irradiation using 60Coγ-ray under an air or nitrogen atmosphere at a certain absorbed dose rate(60 Gy/min).The results showed that h-BN powder had good structural stability underγ-ray radiation at absorbed doses up to 380 kGy.However,the glass transition and initial thermal decomposition temperatures of the h-BN/EP composites were significantly lower than those of the pure EP matrix afterγ-ray radiation.The effect ofγ-ray radiation on the mechanical properties of h-BN/EP composites depends on both the h-BN content and the absorbed dose.For the composite with a low h-BN content(mass fraction<0.52%),the tensile strength decreased remarkably even after the composite was irradiated byγ-ray at a low absorbed dose(≤180 kGy).In contrast,for the composite with a higher h-BN content(mass fraction≥0.52%),the tensile strength increased significantly after theγ-ray radiation at the same absorbed dose.When the absorbed dose was 1000 kGy,the tensile strengths of the irradiated pure EP and all irradiated h-BN/EP composites were the same,i.e.,they had no relationship with the h-BN content.These results indicate that the thermal conductivity of the h-BN/EP composites will be greatly improved afterγ-ray radiation at the absorbed dose of 180 kGy.
作者 朱文刚 姜志文 陈洪兵 黄玮 汪谟贞 葛学武 林铭章 ZHU Wengang;JIANG Zhiwen;CHEN Hongbing;HUANG Wei;WANG Mozhen;GE Xuewu;LIN Mingzhang(CAS Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China;Department of Engineering and Applied Physics,University of Science and Technology of China,Hefei 230026,China)
出处 《辐射研究与辐射工艺学报》 CAS CSCD 2020年第3期10-20,共11页 Journal of Radiation Research and Radiation Processing
基金 科学挑战计划(TZ2018004) 国家自然科学基金(51773189、51573174)资助。
关键词 六方氮化硼 环氧树脂 γ 射线辐射 热稳定性 力学性能 导热系数 Hexagonal boron nitride Epoxy resin γ-ray radiation Thermal stability Mechanical property Thermal conductivity
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