Polymerization of propylene was carried out under bulk process at 70 degrees C using the supported metallocene catalyst with four kinds of SiO2 as carrier with triethylaluminum used as cocatalyst. The morphology of th...Polymerization of propylene was carried out under bulk process at 70 degrees C using the supported metallocene catalyst with four kinds of SiO2 as carrier with triethylaluminum used as cocatalyst. The morphology of the products was studied by SEM. It was found the property of the carriers gave great effect on the fine structure of the products as well as the apperance.展开更多
MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specifi...MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specific properties in electricity, light, magnetism and mechanics as well as their high interfacial density. In many applications, one has to consider the effects arising from microstructure. If the thickness of sublayers is very small (several nanometers),multilayers may exhibit a dimensional periodic structure (modulation structure) in the展开更多
文摘Polymerization of propylene was carried out under bulk process at 70 degrees C using the supported metallocene catalyst with four kinds of SiO2 as carrier with triethylaluminum used as cocatalyst. The morphology of the products was studied by SEM. It was found the property of the carriers gave great effect on the fine structure of the products as well as the apperance.
文摘MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specific properties in electricity, light, magnetism and mechanics as well as their high interfacial density. In many applications, one has to consider the effects arising from microstructure. If the thickness of sublayers is very small (several nanometers),multilayers may exhibit a dimensional periodic structure (modulation structure) in the
