Diblock copolymers containing polystyrene (PSt) andpolybutyl methacrylate (PBMA)segnents and random coplymer of styrene (St) and butyl methacrylate (BMA) havebeen prepared by atom transfer radical polymerizanon (ATRP)...Diblock copolymers containing polystyrene (PSt) andpolybutyl methacrylate (PBMA)segnents and random coplymer of styrene (St) and butyl methacrylate (BMA) havebeen prepared by atom transfer radical polymerizanon (ATRP). Diblock copolymers ofBAN and St with predetermined molecular weight (1× 104ed.5 × 104)and narrowermolecular weight distribution(1.25～1.5) were obained The random copolymercompositions were determined by 1HNMR spectroscopy and the reactivity ratios wereevaluated by the extended Kelen-Tudos method to be γst=0.91, γBMA=0.32.展开更多
Emulsifier-free emulsion polymerization of styrene in the presence of β -hydroxy propyl acrylate was studied. The emulsifier-free self cross linked polystyrene latex microspheres was obtained. Monomer conversion is h...Emulsifier-free emulsion polymerization of styrene in the presence of β -hydroxy propyl acrylate was studied. The emulsifier-free self cross linked polystyrene latex microspheres was obtained. Monomer conversion is higher than 90% when [St], [β-HPA], [KPS] is 2. 66, 0. 228, and 5. 8×10-3 mol/L respectively under 80℃ for 5h. The mono-dispersed latex particle diameter and colloidal particle concentration were given N = 3. 13×1013/cm3 by TEM analyse. The factors of influencing latex stability were discussed. Thecopolymer was characterized by IR and dissolution experiment. The apparent activation energy of polymerization and polymerization rate constant were obtained to be 78. 7KJ/mol and 514. 4L/mol·s respectively.展开更多
文摘Diblock copolymers containing polystyrene (PSt) andpolybutyl methacrylate (PBMA)segnents and random coplymer of styrene (St) and butyl methacrylate (BMA) havebeen prepared by atom transfer radical polymerizanon (ATRP). Diblock copolymers ofBAN and St with predetermined molecular weight (1× 104ed.5 × 104)and narrowermolecular weight distribution(1.25～1.5) were obained The random copolymercompositions were determined by 1HNMR spectroscopy and the reactivity ratios wereevaluated by the extended Kelen-Tudos method to be γst=0.91, γBMA=0.32.
文摘Emulsifier-free emulsion polymerization of styrene in the presence of β -hydroxy propyl acrylate was studied. The emulsifier-free self cross linked polystyrene latex microspheres was obtained. Monomer conversion is higher than 90% when [St], [β-HPA], [KPS] is 2. 66, 0. 228, and 5. 8×10-3 mol/L respectively under 80℃ for 5h. The mono-dispersed latex particle diameter and colloidal particle concentration were given N = 3. 13×1013/cm3 by TEM analyse. The factors of influencing latex stability were discussed. Thecopolymer was characterized by IR and dissolution experiment. The apparent activation energy of polymerization and polymerization rate constant were obtained to be 78. 7KJ/mol and 514. 4L/mol·s respectively.
