Hollow silica nanospheres were synthesized by silyl functionalized poly(vinyl benzyl chloride)(PVBC) latex nanoparticles via surface-initiated atom transfer radical polymerization(ATRP) of 3-(trimethoxysilyl)propyl me...Hollow silica nanospheres were synthesized by silyl functionalized poly(vinyl benzyl chloride)(PVBC) latex nanoparticles via surface-initiated atom transfer radical polymerization(ATRP) of 3-(trimethoxysilyl)propyl methacrylate(TMSPM),followed by polycondensation with tetraethoxysi-lane(TEOS) in the ethanol-ammonia and removal of the PVBC cores by thermal decomposition.Transmission electron microscopy(TEM) were used to characterize the intermediate products and the hollow nanospheres.展开更多
The morphological evolution of the latex particles obtained by VAc/BA two stage emulsion polymerization was studied. The designs of two group experiments were as follows:VAc as seed , BA was added in starved or overfl...The morphological evolution of the latex particles obtained by VAc/BA two stage emulsion polymerization was studied. The designs of two group experiments were as follows:VAc as seed , BA was added in starved or overflown condition. The inverted core shell composite latex particles, with PVAc as shell and PBA as core, were found in overflown condition, however, the core shell composite latex particles, with PVAc as core and PBA as shell were found in starved condition. When the core shell composite latex particles in different time in starved condition was kept to reaction end, the morphology of the latex particles inverted. Comparing with the previous work in literature, this paper can provide better and more complete understanding about the morphological evolution of the latex particles in the process of seeded emulsion polymerization of VAc/BA. The photos of TEM of morphology of the latex particles in the process under two conditions and temperature being kept constant were obtained. From viscosity,the existed paradoxical views about the morphology of the latex particles on VAc/BA can be explained in a better and more complete way.展开更多
文摘Hollow silica nanospheres were synthesized by silyl functionalized poly(vinyl benzyl chloride)(PVBC) latex nanoparticles via surface-initiated atom transfer radical polymerization(ATRP) of 3-(trimethoxysilyl)propyl methacrylate(TMSPM),followed by polycondensation with tetraethoxysi-lane(TEOS) in the ethanol-ammonia and removal of the PVBC cores by thermal decomposition.Transmission electron microscopy(TEM) were used to characterize the intermediate products and the hollow nanospheres.
文摘The morphological evolution of the latex particles obtained by VAc/BA two stage emulsion polymerization was studied. The designs of two group experiments were as follows:VAc as seed , BA was added in starved or overflown condition. The inverted core shell composite latex particles, with PVAc as shell and PBA as core, were found in overflown condition, however, the core shell composite latex particles, with PVAc as core and PBA as shell were found in starved condition. When the core shell composite latex particles in different time in starved condition was kept to reaction end, the morphology of the latex particles inverted. Comparing with the previous work in literature, this paper can provide better and more complete understanding about the morphological evolution of the latex particles in the process of seeded emulsion polymerization of VAc/BA. The photos of TEM of morphology of the latex particles in the process under two conditions and temperature being kept constant were obtained. From viscosity,the existed paradoxical views about the morphology of the latex particles on VAc/BA can be explained in a better and more complete way.
