مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Information Journal Paper

Title

PREPARATION OF DIBLOCK AND TRIBLOCK COPOLYMERS OF STYRENE, 2,5-NORBORNADIENE, ETHYLMETHACRYLATE AND PEG BY NITROXIDE-CONTROLLED FREE RADICAL POLYMERIZATION

Pages

  393-402

Abstract

 2,5-NORBORNADIENE has been polymerized in bulk at 125 °C in presence of a low molar mass of POLYSTYRENE-TEMPO as macroinitiator. The structure and poly-dispersity of the obtained diblock copolymer (PSt-PNB-TEMPO) were determined by IR,1 H NMR spectroscopy and GPC measurement, respectively, where TEMPO is 2,2,6,6 tetramethylpiperidinyl-1-oxy and PNB is polynorbornadiene. The triblock copolymer of styrene-2,5-NORBORNADIENE-ethylmethacrylate (PSt-PNB-PEMA) using a PSt-PNB-TEMPO as the macroinitiator in the presence of camphorsulphonic acid (CSA) was prepared. Also the triblock. copolymer containing polyethylmethacrylate and poly(ethylene glycol) designated as PEMA-PEG-PEMA was synthesized by a novel method. The 1H NMR and FTIR studies of triblock copolymers confirmed their structures and the absence of TEMPO end groups for PEMA.

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