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聚丙烯酸铅/环氧树脂辐射防护材料的制备及性能研究 被引量:5

PREPARATION OF NANO-POLY(LEAD ACRYLATE) EPOXY RESIN BASED RADIATION-PROTECTION MATERIAL AND ITS PROPERTIES
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摘要 采用γ辐射接枝聚合法制备了纳米聚丙烯酸铅/环氧树脂辐射防护材料,利用傅立叶变换红外光谱仪(FTIR)、X射线衍射谱仪(XRD)、透射电镜(TEM)和扫描电镜(SEM)对其结构进行了分析,利用材料万能试验机测量了拉伸性能和三点弯曲性能,利用多道γ谱仪测量了屏蔽性能.结果表明,复合材料为两相聚合物共混体系,其分散形态呈明显的海-岛结构.聚丙烯酸铅微球粒径约为5nm,具有一定的结晶,微球表面连接环氧树脂分子形成三维网状结构.复合材料特殊结构使其韧性和强度较纯环氧树脂有明显的提高,其断口呈现一定的韧性断裂的特征,对γ射线的质量吸收系数高于铅的质量吸收系数,是一种屏蔽性能十分突出的轻质材料. A kind of radiation-protection material based on nano-poly(lead acrylate ) epoxy resin was successfully prepared via graft copolymerization route induced by γ irradiation. Epoxy resin contains ether bond,so the α-H atoms of the ortho-carbon and tert-carbon atoms are relatively active. Lead acrylate contains double bond. Under the exposure of γ-rays they can become the epoxidized free radicals and acrylic lead free radicals,which lead to graft polymerization. The product was characterizedand and analyzed with Fourier transform infrared spectroscopy ( FTIR),X-ray diffraction ( XRD),transmission electron microscopy ( TEM) and scanning electron microscopy ( SEM ). The stretching and bending capabilities were measured with a material all-purpose testing machine. Gamma energy spectrum measurement was carried out to evaluate its radiation-shielding properties. The results revealed that this composite material has a sea-island biphase structure. Poly(lead acrylate) particles were partially crystalline,and the particle size was about 5 nm. Graft polymerization of the two components occured at the surface of the poly(lead acrylate) particles and resulted in a network structure,which improved the mechanical properties of epoxyresin. The γ-ray mass absorption coefficient of this material with the value of 0. 060 cm^2 /g under 1. 33 MeV was higher than that of lead,so that it was a good radiation-protection material with low density of 1. 37 g /cm^3. The material may be applied to the field of aerospace radiation protection or radiation protection glass of electronic components packaging.
作者 张瑜 戴耀东 李江苏 孙浩 常树全 ZHANG Yu,DAI Yaodong,LI Jiangsu,SUN Hao,CHANG Shuquan (College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016)
出处 《高分子学报》 SCIE CAS CSCD 北大核心 2010年第5期582-587,共6页 Acta Polymerica Sinica
基金 江苏省自然科学基金(基金号BK2008400)资助项目
关键词 接枝聚合 Γ辐射 质量吸收系数 Graft copolymerization γ-Radiation Mass absorption coefficient
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