The effect of a phase nucleating agent （NA） 1,3：2,4-bis（3,4-dimethylbenzylidene） sorbitol （DMDBS） on crystallization and physical properties of polypropylene/calcium carbonate （PP/CaCO3） composites has been c...The effect of a phase nucleating agent （NA） 1,3：2,4-bis（3,4-dimethylbenzylidene） sorbitol （DMDBS） on crystallization and physical properties of polypropylene/calcium carbonate （PP/CaCO3） composites has been comparatively investigated. Compared with binary PP/CaCO3 composites, in which CaCO3 exhibits weak heterogeneous nucleation, inconspicuous reinforcement and toughening effects for PP, the introduction of a few amounts of DMDBS induces a great increase of the degree of crystallinity. Largely improved tensile properties, fracture toughness at relatively higher temperature and heat deformation temperature （HDT） are observed for DMDBS nucleated PP/CaCO3 composites.展开更多
This study examines some physical and mechanical characteristics of polypropylene (PP) and calcium trioxocarbonate IV (CaCO3) composites prepared by melt blending. The mechanical (tensile strength and impact energy re...This study examines some physical and mechanical characteristics of polypropylene (PP) and calcium trioxocarbonate IV (CaCO3) composites prepared by melt blending. The mechanical (tensile strength and impact energy resistance) and physical (density and water absorption capacity) properties of the composites were evaluated using 0% - 40% of the filler. The results showed that 20%-CaCO3 addition improved the ultimate tensile stress by 58%, and the UTS is 84% better when 25%-CaCO3 addition is made while the impact resistance decline by 8 and 12% respectively at these two compositions. In addition, the density only differ from that of pure PP at 25% CaCO3 addition by 18% increment, however, water absorption increased by 400% at 10%-CaCO3 addition.展开更多
基金supported by the National Natural Science and Technology Foundation(No.50403019)Program for New Century Excellent Talents in Universities(NCET-08-0823)Sichuan Youthful Science and Technology Foundation(07ZQ026-003)(China)
文摘The effect of a phase nucleating agent （NA） 1,3：2,4-bis（3,4-dimethylbenzylidene） sorbitol （DMDBS） on crystallization and physical properties of polypropylene/calcium carbonate （PP/CaCO3） composites has been comparatively investigated. Compared with binary PP/CaCO3 composites, in which CaCO3 exhibits weak heterogeneous nucleation, inconspicuous reinforcement and toughening effects for PP, the introduction of a few amounts of DMDBS induces a great increase of the degree of crystallinity. Largely improved tensile properties, fracture toughness at relatively higher temperature and heat deformation temperature （HDT） are observed for DMDBS nucleated PP/CaCO3 composites.
文摘This study examines some physical and mechanical characteristics of polypropylene (PP) and calcium trioxocarbonate IV (CaCO3) composites prepared by melt blending. The mechanical (tensile strength and impact energy resistance) and physical (density and water absorption capacity) properties of the composites were evaluated using 0% - 40% of the filler. The results showed that 20%-CaCO3 addition improved the ultimate tensile stress by 58%, and the UTS is 84% better when 25%-CaCO3 addition is made while the impact resistance decline by 8 and 12% respectively at these two compositions. In addition, the density only differ from that of pure PP at 25% CaCO3 addition by 18% increment, however, water absorption increased by 400% at 10%-CaCO3 addition.
