Citation: . SYNTHESIS AND CHARACTERIZATION OF FOUR-ARMED BLOCK POLY(STYRENE-b-p-NITROPHENYL METHACRYLATE)PREPARED BY THE ATRP METHOD*[J]. Chinese Journal of Polymer Science, ;2002, 20(4): 353-360. shu

SYNTHESIS AND CHARACTERIZATION OF FOUR-ARMED BLOCK POLY(STYRENE-b-p-NITROPHENYL METHACRYLATE)PREPARED BY THE ATRP METHOD*

Received Date: 26 July 2001
Revised Date: 9 October 2001

A novel tetrafunctional initiator, C [CH2O (CH2)3 OOCCH(Br)CH3]4 (1), was synthesized through the reaction oftetraol with α-bromopropionyl chloride, and then was used as initiator of atom transfer radical polymerization (ATRP) in thepreparation of 4-armed polystyrene (PSt) with narrow polydispersity. The structure, molecular weight and molecular weightdistribution (MWD) of each arm were studied by 1H-NMR and GPC data of hydrolyzed products of the 4-armed PSt.The ATRP of St using 1/CuBr/bpy as initiator system is of "living" character based on the following evidence:narrow MWD,constant concentration of chain radical during the polymerization,control of molecular weight by the molar ratio of monomer consumed to 1.The 4-armed poly(St-b-P-nitrophenyl methacrylate)[poly(St-b-NPMA)] was prepared by the ATRP of NPMA using 4-armed PSt with terminal bromine as the initiator,and characterized by FT-IR,1H-NMR spectra and GPC curves.The micelles with PSt as core,and PNPMA as shell were formed by dropping DMSO into a solution of 4-armed poly(St-b-NPMA) in DMF,as proved by laser light scatter(LLS) method.
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