Journal of East China Normal University(Natural Sc ›› 2015, Vol. 2015 ›› Issue (3): 116-123.doi: 10.3969/j.issn.1000-5641.2015.03.014

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Synthesis of amphiphilic copolymer PEO-b-PtBA with narrow molecular weight distribution and its hydrolysis

KAYIRBEK Gulsum1,ANAS Hudrat2,MUSLIM Arzugul1   

  • Received:2014-04-28 Online:2015-05-25 Published:2015-05-28

Abstract: A group of amphiphilic diblock copolymers PEO45-b-PtBAx(x=28, 35, 53) were synthesized by ATRP using PEO-Br as macroinitiator. Samples were characterized by SEC, 1H NMR, FTIR and TEM. The influence of feed ratio to the control of the structure, molecular weight and molecular weight distributions were discussed. The results showed that, the conversion of tBA was high and the 1H NMR results confirmed the targeted products were synthesized successfully. All three copolymers had a narrow molecular weight distributions (Mw/Mn≤1.07). When the feed ratio of tBA to PEOBr was low, the structures of copolymers could be controlled accurately. The increase of feed ratio of tBA to PEOBr caused broadening of molecular weight distributions and the decreasing of initiating efficiency. The hydrolysis of PEO45-b-PtBA35 to PEO45-b-PAA35 was performed successfully. PEO45-b-PAA35was selfassembled into well dispersed spherical micelles in neutral aqueous solution.

Key words: amphiphilic copolymer, ATRP, PEO-PtBA, hydrolysis

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