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.
Acta Polymerica Sinica
Mass absorption coefficient