Diblock Copolymer Synthesis

The large variation in polymerization rates among the various 2-oxazoline monomers has been exploited for the preparation of quasi-diblock copolymers, namely, gradient copolymers with a narrow and steep monomer gradient, by statistical copolymerization of selected monomer combinations exhibiting large differences in reactivity. Such a one-pot quasi-diblock copolymer synthesis was first demonstrated for the statistical copolymerization of 2-phenyl-2-oxazoline and a much less reactive 2-perfluoroalkyl-2-oxazoline [174]. This living CROP (in nitromethane at 120 °C initiated by methyl p-nitrobenzenesulfonate) revealed complete consumption of the 2-phenyl-2-oxazoline after 2 min with only minor incorporation of the fluorinated monomer. Continuation of the polymerization for another 40 h led to full conversion of the fluorinated monomer. The... 

Wang, Y.B. and Hillmyer, M A. (2001) Polyethylene-poly(L-lactide) diblock copolymers Synthesis and compatibiliza-tion of poly(L-lactide)/polyethylene blends. Journal of Polymer Science Part A Polymer Chemistry, 39,2755 2766. 

Krupers, M.J. and MoUer, M. (1997b) Semifluorinated diblock copolymers. Synthesis, characterization, and amphiphilic properties. Macromolecular Chemistry and Physics, 198,2163-2179. 

Menon, S., Thekkayil, R., Varghes, S., Das, S. Photoresponsive soft materieils synthesis and photophysical studies of a stilbene-based diblock copolymer synthesis and photophysical studies of a stilbene-based diblock copolymer. J. Polym. Sci. A Polym. Chem. 49, 5063-5073 (2011)... 

Kumar, A., Gross, R.A., Wang, Y. and Hillmyer, M.A. (2002) Recognition of lipases of -hydroxyl macroinitiators for diblock copolymer synthesis. Macromolecules, 35, 7606-11. 

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