Oleic acid OA-modified CaCO3 nanoparticles were prepared using surface modification method. In- frared spectroscopy IR was used to investigate the structure of the modified CaCO3 nanoparticles, and the result showed t...Oleic acid OA-modified CaCO3 nanoparticles were prepared using surface modification method. In- frared spectroscopy IR was used to investigate the structure of the modified CaCO3 nanoparticles, and the result showed that OA attached to the surface of CaCO3 nanoparticles with the ionic bond. Effect of OA concentration on the dispersion stability of CaCO3 in heptane was also studied, and the result indicated that modified CaCO3 nanoparticles dispersed in heptane more stably than unmodified ones. The optimal proportion of OA to CaCO3 was established. The effect of modified CaCO3 nanoparticles on crystallization behavior of polypropylene PP was studied by means of DSC. It was found that CaCO3 significantly increased the crystallization temperature, crystal- lization degree and crystallization rate of PP, and the addition of modified CaCO3 nanoparticles can lead to the for- mation of β-crystal PP. Effect of the modified CaCO3 content on mechanical properties of PPCaCO3 nanocompo- sites was also studied. The results showed that the modified CaCO3 can effectively improve the mechanical proper- ties of PP. In comparison with PP, the impact strength of PPCaCO3 nanocomposites increased by about 65% and the flexural strength increased by about 20%.展开更多
The effect of blending routes on the morphology and properties of Polyamide-6 (PA-6)/nano-CaCO3/Maleated ethylene-octane copolymer (MA-POE) ternary composite was analyzed using static mechanical test (DMA), TEM (trans...The effect of blending routes on the morphology and properties of Polyamide-6 (PA-6)/nano-CaCO3/Maleated ethylene-octane copolymer (MA-POE) ternary composite was analyzed using static mechanical test (DMA), TEM (transmission electronic microscope) and SEM (scanning electron microscope). It was found that MA-POE, as an impact modifier, had a profound effect upon the toughness of the PA-6/nano-CaCO3 composite. In particular, by adopting two-stage blending route, the microstructure of the ternary composites turned to core-shell structure, and the impact toughness was improved greatly. At the same time, tensile strength and dynamic storage modulus (E1) were higher than those with one-stage blending route processed ternary composite. The results suggest that blending routes may improve the properties of PA-6/nano-CaCO3/MA-POE ternary composites.展开更多
基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars
文摘Oleic acid OA-modified CaCO3 nanoparticles were prepared using surface modification method. In- frared spectroscopy IR was used to investigate the structure of the modified CaCO3 nanoparticles, and the result showed that OA attached to the surface of CaCO3 nanoparticles with the ionic bond. Effect of OA concentration on the dispersion stability of CaCO3 in heptane was also studied, and the result indicated that modified CaCO3 nanoparticles dispersed in heptane more stably than unmodified ones. The optimal proportion of OA to CaCO3 was established. The effect of modified CaCO3 nanoparticles on crystallization behavior of polypropylene PP was studied by means of DSC. It was found that CaCO3 significantly increased the crystallization temperature, crystal- lization degree and crystallization rate of PP, and the addition of modified CaCO3 nanoparticles can lead to the for- mation of β-crystal PP. Effect of the modified CaCO3 content on mechanical properties of PPCaCO3 nanocompo- sites was also studied. The results showed that the modified CaCO3 can effectively improve the mechanical proper- ties of PP. In comparison with PP, the impact strength of PPCaCO3 nanocomposites increased by about 65% and the flexural strength increased by about 20%.
基金This work was financially supported by the National Natural Science Foundation of China under grant No.29934070.
文摘The effect of blending routes on the morphology and properties of Polyamide-6 (PA-6)/nano-CaCO3/Maleated ethylene-octane copolymer (MA-POE) ternary composite was analyzed using static mechanical test (DMA), TEM (transmission electronic microscope) and SEM (scanning electron microscope). It was found that MA-POE, as an impact modifier, had a profound effect upon the toughness of the PA-6/nano-CaCO3 composite. In particular, by adopting two-stage blending route, the microstructure of the ternary composites turned to core-shell structure, and the impact toughness was improved greatly. At the same time, tensile strength and dynamic storage modulus (E1) were higher than those with one-stage blending route processed ternary composite. The results suggest that blending routes may improve the properties of PA-6/nano-CaCO3/MA-POE ternary composites.
