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《Acta Materiae Compositae Sinica》 2018-06
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Preparation and properties of nano SiO_2-carboxyl carboxyl nitrile rubber modified water-based epoxy resin composite

ZHOU Haoran;MAO Shanshan;School of Materials Science and Engineering,Harbin University of Science and Technology;  
The carboxyl carboxyl nitrile rubber(CTBN)and nano-silica(nano SiO_2)were used as toughening agents,the copolymer of CTBN and epoxy resin(EP)were prepared as an emulsion by reverse transfer,followed by addition of nano SiO_2 for blending.Finally,the curing agent was added to prepare the nano SiO_2-CTBN modified water-based EP(nano SiO_2-CTBN/WEP)composite by gradient heating.The properties of the nano SiO_2-CTBN/WEPcomposite were characterized by an FTIR,SEM,TEM,universal tensile tester and TGA.The results show that:when the CTBN mass fraction is 20%(mass ratio to EP E-51),the prepared CTBN/WEP emulsion exhibites better storage stability.The addition of 3% nano SiO_2 in CTBN/WEP resultes in the best effect of toughening.The tensile strength is 14.5 MPa,the elongation at break is 9.1%,the impact strength is 11.3 kJ/m2 and the flexural strength is 22.4 MPa,which increase by 40.1%,27.4%,73.9% and 72.7%,respectively,compared with the CTBN/WEP sample without adding of nano SiO_2.The initial thermal decomposition temperature of the nano SiO_2-CTBN/WEP also increases by nearly 25℃.
【CateGory Index】: TB332
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