he photon correlation spectroscopy and small-angle X-ray scattering is used for study the mixture of C12E5 microemulsion with PEG in order to determine structure and dynamic of the system. Photon correlation spectrosc...he photon correlation spectroscopy and small-angle X-ray scattering is used for study the mixture of C12E5 microemulsion with PEG in order to determine structure and dynamic of the system. Photon correlation spectroscopy experiment showed an exponential relaxation for pure C12E5 microemulsion that come from Brownian motion of oil nano-droplets in water. The shape of the relaxation changed with increasing of PEG concentration in the C12E5 microemulsion, (relaxation becomes non-exponential with the increase of PEG), which demonstrates an increase of cooperatively in the C12E5 microemulsion. The SAXS experiment was used to study the structure of the system, and a model consists of a mixture of core-shell spheres with an Asakura-Oosawa interaction was applied to analyze data.展开更多
This paper reports the kinetics of group transfer polymerization (GTP)of ethyl acrylate (EA)with zinc iodide catalyst in 1,2-dichloroethane using dimethyl ketene methyl trimethylsilyl acetal (MTS) as initiator at 0℃ ...This paper reports the kinetics of group transfer polymerization (GTP)of ethyl acrylate (EA)with zinc iodide catalyst in 1,2-dichloroethane using dimethyl ketene methyl trimethylsilyl acetal (MTS) as initiator at 0℃ and above 0℃. The amount of catalyst used was studied. When zinc iodide catalyst used is more than 10mol% relative to monomer, the rate of polymerization is proportional to the concentration of monomer, whereas zinc iodide catalyst used is less than 10 mol% of the monomer, the rate of polymerization is independent of the monomer concentration.In the GTP of EA an induction period was observed when the zinc iodide contents are less than l0mol%. If the reaction temperature is over 0℃, living species become unstable and diminish, leading to incomplete monomer conversion. The reaction curves equations are obtained. The polymers have narrow molecular weight distributions which are not changed as decreasing zinc iodide contents. The polydispersity is about 1.2.展开更多
Among industrial derivatives of ethylene,ethylene oxide (EO) is an important organicchemical product, surpassed only by polyethylene(PE) and polyvinyl chloride(PVC).EO is mainly used to produce ethyleneglycol (EG).It ...Among industrial derivatives of ethylene,ethylene oxide (EO) is an important organicchemical product, surpassed only by polyethylene(PE) and polyvinyl chloride(PVC).EO is mainly used to produce ethyleneglycol (EG).It is also one of the mostimportant raw materials for making nonionicsurfactants.EO has a wide range ofuses in industries such as dyeing,electronics, pharmaceuticals, textiles,pesticides, paper, automotive, oil extractionand refining, and it has a broad marketprospect.Most of the world’s EO plants have beenmatched with EG production facilities.Theworld’s major EO manufacturers are TheDow Chemical Company, Saudi Basic IndustriesCorporation (SABIC),展开更多
基金This work was supported by the University of Sistan and Baluchestan and SFB-569(DFG)the Research Collabo-rative Center of the Institut für Experimentelle Physik,Universität Ulm.
文摘he photon correlation spectroscopy and small-angle X-ray scattering is used for study the mixture of C12E5 microemulsion with PEG in order to determine structure and dynamic of the system. Photon correlation spectroscopy experiment showed an exponential relaxation for pure C12E5 microemulsion that come from Brownian motion of oil nano-droplets in water. The shape of the relaxation changed with increasing of PEG concentration in the C12E5 microemulsion, (relaxation becomes non-exponential with the increase of PEG), which demonstrates an increase of cooperatively in the C12E5 microemulsion. The SAXS experiment was used to study the structure of the system, and a model consists of a mixture of core-shell spheres with an Asakura-Oosawa interaction was applied to analyze data.
文摘This paper reports the kinetics of group transfer polymerization (GTP)of ethyl acrylate (EA)with zinc iodide catalyst in 1,2-dichloroethane using dimethyl ketene methyl trimethylsilyl acetal (MTS) as initiator at 0℃ and above 0℃. The amount of catalyst used was studied. When zinc iodide catalyst used is more than 10mol% relative to monomer, the rate of polymerization is proportional to the concentration of monomer, whereas zinc iodide catalyst used is less than 10 mol% of the monomer, the rate of polymerization is independent of the monomer concentration.In the GTP of EA an induction period was observed when the zinc iodide contents are less than l0mol%. If the reaction temperature is over 0℃, living species become unstable and diminish, leading to incomplete monomer conversion. The reaction curves equations are obtained. The polymers have narrow molecular weight distributions which are not changed as decreasing zinc iodide contents. The polydispersity is about 1.2.
文摘Among industrial derivatives of ethylene,ethylene oxide (EO) is an important organicchemical product, surpassed only by polyethylene(PE) and polyvinyl chloride(PVC).EO is mainly used to produce ethyleneglycol (EG).It is also one of the mostimportant raw materials for making nonionicsurfactants.EO has a wide range ofuses in industries such as dyeing,electronics, pharmaceuticals, textiles,pesticides, paper, automotive, oil extractionand refining, and it has a broad marketprospect.Most of the world’s EO plants have beenmatched with EG production facilities.Theworld’s major EO manufacturers are TheDow Chemical Company, Saudi Basic IndustriesCorporation (SABIC),
