Effect of UV Aging on Shear Properties and Pore Structure of Polymer-based Composites
WANG Zhihang1, XU Jinyu1,2, LIU Gaojie1, ZHU Congjin1
1 School of Aeronautical Engineering, Air Force Engineering University, Xi'an 710038, China 2 College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, China
Abstract: Polymer-based composites prepared with styrene-acrylic emulsion and VAE emulsion as organic components are the research objects. Using the method of artificially accelerated ultraviolet(UV) aging in the laboratory, the shear test and mercury intrusion test were carried out on the composites that were not aged and after 1 d(day), 7 d, 15 d, and 30 d UV aging. By testing the composites shear strength, shear peak strain, shear elongation at break, shear toughness, shear pre-peak toughness and pore structure parameters, the influence of ultraviolet aging on the shear properties and pore structure of composite materials was studied. The results show that UV aging can improve the shear strength, shear toughness and shear pre-peak toughness of composites, and enhanced shear performance of composite. With the prolongation of UV aging time, the shear strength of the composite material continues to increase; after 30 d of UV aging, the shear strength of the composites increased by 70.25%. With the prolongation of UV aging time, the shear toughness and shear pre-peak toughness first increase and then decrease; after 7 d of UV aging, the shear toughness increased by 34.06%; after 15 d of UV aging, the shear pre-peak toughness increased by 101.68%. UV aging increased the peak shear strain of the composites within a certain range, after 15 d of UV aging, the peak shear strain of the composites increased by 18.83%. Due to the photo-oxygen reaction, the secondary hydration reaction of cement and the cross-linking and curing reaction, after UV aging, the shear elongation at break of composites continues to decrease. UV aging has a greater impact on the pore structure of the composites. After 7 d of UV aging, the total pore volume of the polymer matrix composites was reduced by 18.00%. With the extension of the UV aging time, the pore size distribution of composites gradually shifted to larger pore sizes.
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