Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characteri...Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characterization of modified pore walls of template by solvents with different polarities. And the relationship between PVP nano-tube formation and modification of pore walls of template was discussed preliminary.展开更多
Thermally stable and biodegradable composites from poly （propylene carbonate） （PPC）, poly （ethylene-co-vinyl alcohol） （EVOH）, starch and CaCO3 were fabricated by melt blending. Differential scanning calorimet...Thermally stable and biodegradable composites from poly （propylene carbonate） （PPC）, poly （ethylene-co-vinyl alcohol） （EVOH）, starch and CaCO3 were fabricated by melt blending. Differential scanning calorimetry （DSC）, differential thermal analysis/thermal gravimetric analysis （DTA/TGA）, tensile test and scanning electron microscope （SEM） were performed to investigate the miscibility, thermal behavior and tensile properties of the PPC/EVOH/Starch/CaCO3 composites. DSC results indicate that the introduction of EVOH could improve the compatibility between PPC and starch to some extent because of the interfacial interaction between PPC and EVOH, leading to an increase in tensile strength. The tensile strength began to decrease when more starch was added due to the aggregation of starch particles. SEM examination showed the good interracial bonding between the fillers and polymeric components. The incorporation of both EVOH and fillers can greatly increase the thermal stability of PPC matrix. The PPC/EVOH/Starch/CaCO3 composites can be melt processed and can be used as a common biodegradable material for a wide application.展开更多
文摘Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characterization of modified pore walls of template by solvents with different polarities. And the relationship between PVP nano-tube formation and modification of pore walls of template was discussed preliminary.
基金Funded by Guangdong Province Sci&Tech Bureau(No.2006B12401006)Guangzhou Sci&Tech Bureau(No.2005U13D2031),P.R.China
文摘Thermally stable and biodegradable composites from poly （propylene carbonate） （PPC）, poly （ethylene-co-vinyl alcohol） （EVOH）, starch and CaCO3 were fabricated by melt blending. Differential scanning calorimetry （DSC）, differential thermal analysis/thermal gravimetric analysis （DTA/TGA）, tensile test and scanning electron microscope （SEM） were performed to investigate the miscibility, thermal behavior and tensile properties of the PPC/EVOH/Starch/CaCO3 composites. DSC results indicate that the introduction of EVOH could improve the compatibility between PPC and starch to some extent because of the interfacial interaction between PPC and EVOH, leading to an increase in tensile strength. The tensile strength began to decrease when more starch was added due to the aggregation of starch particles. SEM examination showed the good interracial bonding between the fillers and polymeric components. The incorporation of both EVOH and fillers can greatly increase the thermal stability of PPC matrix. The PPC/EVOH/Starch/CaCO3 composites can be melt processed and can be used as a common biodegradable material for a wide application.
