PS/MWNT composites have been prepared by supension polymerization.It was obvious that the yield of PS was lower for the addition of MWNT.GPC tests showed when the added amount of MWNT was smaller,the molecular weight ...PS/MWNT composites have been prepared by supension polymerization.It was obvious that the yield of PS was lower for the addition of MWNT.GPC tests showed when the added amount of MWNT was smaller,the molecular weight of PS was higher than that of pure PS for the volume effect of MWNT terminating PS chains.And when the added amount of MWNT was larger,the molecular weight of PS was lower than that of pure PS for the weaker activity of free radicals and interference of MWNT.展开更多
In order to attain new functional nanomaterials with good magnetic property,multi-walled carbon nanotubes/hematite (MWNTs/α-Fe2O3)composites were synthesized using the co-deposition method.MWNTs/α-Fe2O3 composites w...In order to attain new functional nanomaterials with good magnetic property,multi-walled carbon nanotubes/hematite (MWNTs/α-Fe2O3)composites were synthesized using the co-deposition method.MWNTs/α-Fe2O3 composites were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman spectroscopy and vibrating sample magnetometry(VSM).The experimental results show that the structure and magnetic properties of the MWNTs/α-Fe2O3 composites are related to the heat treatment temperature.MWNTs are modified byα-Fe2O3 nano-particles andα-Fe2O3 nanorods with a diameter of 10-50 nm after being treated at 450℃.When the heat treatment temperature exceeds 600 ℃,MWNTs are only modified by Fe3O4 particles.Furthermore,the MWNTs composites treated at 450 ℃and 600℃have good magnetic behaviour.展开更多
文摘PS/MWNT composites have been prepared by supension polymerization.It was obvious that the yield of PS was lower for the addition of MWNT.GPC tests showed when the added amount of MWNT was smaller,the molecular weight of PS was higher than that of pure PS for the volume effect of MWNT terminating PS chains.And when the added amount of MWNT was larger,the molecular weight of PS was lower than that of pure PS for the weaker activity of free radicals and interference of MWNT.
基金Projects(5077203320876016)supported by the National Natural Science Foundation of China+3 种基金Project(09JJ3095)supported by Natural Science Foundation of of Hunan Province,ChinaProjects(20080134020070420820)supported by the China Postdoctoral Science Foundationproject(09A001)supported by Scientific Research Fund of Hunan Provincial Education Department,China
文摘In order to attain new functional nanomaterials with good magnetic property,multi-walled carbon nanotubes/hematite (MWNTs/α-Fe2O3)composites were synthesized using the co-deposition method.MWNTs/α-Fe2O3 composites were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman spectroscopy and vibrating sample magnetometry(VSM).The experimental results show that the structure and magnetic properties of the MWNTs/α-Fe2O3 composites are related to the heat treatment temperature.MWNTs are modified byα-Fe2O3 nano-particles andα-Fe2O3 nanorods with a diameter of 10-50 nm after being treated at 450℃.When the heat treatment temperature exceeds 600 ℃,MWNTs are only modified by Fe3O4 particles.Furthermore,the MWNTs composites treated at 450 ℃and 600℃have good magnetic behaviour.
