The interaction between water-soluble copolymer P(AM/AMPS) and various anionic surfactants, and the related changes in thecroscopic and macroscopic viscosity were comParatively studied by fluorescence probe and viscos...The interaction between water-soluble copolymer P(AM/AMPS) and various anionic surfactants, and the related changes in thecroscopic and macroscopic viscosity were comParatively studied by fluorescence probe and viscosimeter. The results obtAned show that the associated complex is formed via the hydrophobic chain interaction at a certain concentration, aong with a drastic increase in Ancroscopic and macroscopic viscosity. The surfactants with wealler hydrophobicity, such as SDS as SLS forms a relatively loose complex and possesses a lower Ancroscopic and macroscoPic viscosity. The other surfactants having a longer hydrocarbon chain and stronger hydrophobicity, such as SBS and SK, display a more tightly packed structure and greater ndcroscopic and macroscopic viscosity.However, as furhter su-rfactant SBS is added, the further intermolecular association results in change of polymer chain conformation from stretch to coiled state and simultaneously decreases in the macroscopic viscosity.展开更多
Based on the concept of melt residual bonds, a calculating model quantitatively describing the evolution of the residual bond structure of titanium melt at the melting point or in a certain range above the melting poi...Based on the concept of melt residual bonds, a calculating model quantitatively describing the evolution of the residual bond structure of titanium melt at the melting point or in a certain range above the melting point was established; i.e., both the size ds and the bond number n of the residual bond structure decrease monotonously with the increase of temperature. By mathe- matical deduction, a linear relationship between the residual bond structure size ds and the dynamic viscosity 17 of Titanium melt was revealed, i.e., η= 0.876 ＋ 0.471·ds, which is of great significance to the investigation of the relationship between the melt microstructure and the macroscopic properties of metals with high melting temperature.展开更多
文摘The interaction between water-soluble copolymer P(AM/AMPS) and various anionic surfactants, and the related changes in thecroscopic and macroscopic viscosity were comParatively studied by fluorescence probe and viscosimeter. The results obtAned show that the associated complex is formed via the hydrophobic chain interaction at a certain concentration, aong with a drastic increase in Ancroscopic and macroscopic viscosity. The surfactants with wealler hydrophobicity, such as SDS as SLS forms a relatively loose complex and possesses a lower Ancroscopic and macroscoPic viscosity. The other surfactants having a longer hydrocarbon chain and stronger hydrophobicity, such as SBS and SK, display a more tightly packed structure and greater ndcroscopic and macroscopic viscosity.However, as furhter su-rfactant SBS is added, the further intermolecular association results in change of polymer chain conformation from stretch to coiled state and simultaneously decreases in the macroscopic viscosity.
基金supported by the National Basic Research Program of China (Grant Nos. 2007CB613803 and 2007CB613702)
文摘Based on the concept of melt residual bonds, a calculating model quantitatively describing the evolution of the residual bond structure of titanium melt at the melting point or in a certain range above the melting point was established; i.e., both the size ds and the bond number n of the residual bond structure decrease monotonously with the increase of temperature. By mathe- matical deduction, a linear relationship between the residual bond structure size ds and the dynamic viscosity 17 of Titanium melt was revealed, i.e., η= 0.876 ＋ 0.471·ds, which is of great significance to the investigation of the relationship between the melt microstructure and the macroscopic properties of metals with high melting temperature.
