A poly(a-methylstyrene-b-methyl methacrylate) with styryl groups on the poly(methyl methacrylate) (PMMA) sequence was prepared and dissolved in a mixed solvent, benzene/cyclohexane (30/70 v/v), to make micelles with a PMMA core. The dissociation time of a polymer chain from a polymer micelle was determined as 46.3 min from viscometric measurements by the concentration jump method. The PMMA core of the polymer micelles was crosslinked via the styryl groups with a radical initiator (2,2'-azobis(4- methoxy-2,4-dimethylvaleronitrile), V-70) or a redox initiator (dimethylaniline plus benzoyl peroxide) at 40°C. With the redox initiator, 96% of the crosslinking groups reacted after 46.3 min and monodisperse microgels were obtained. With V-70, 2% of the crosslinking groups reacted after 46.3 min and inter-miceile crosslinking was not prevented.
Посилання на статтю:
Crosslinking of the inner poly(methyl methacrylate) core of poly (=-methylstyreneb- methyl methacrylate) micelles in a selective solvent: 4. Reaction rate effects / Reiko Saito, Koji Ishizu and Takashi Fukutomi // Polymer. – 1992. – Vol 33. – P. 1712-1716.