Synthesis of amphiphilic block copolymer by metal‐free ring‐opening oligomerization of glycidyl phenyl ether initiated with tetra‐n‐butylammonium fluoride in the presence of poly(ethylene glycol) monomethyl ether |
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| Authors: | Hisatoyo Morinaga Yusuke Ujihara Takeshi Endo |
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| Institution: | 1. Department of Materials Science and Engineering, Kochi National College of Technology, , Nankoku, Kochi, 783–8508 Japan;2. Advanced Course in Materials Science and Engineering, Kochi National College of Technology, , Nankoku, Kochi, 783–8508 Japan;3. Molecular Engineering Institute, Kinki University, , Iizuka, Fukuoka, 820–8555 Japan |
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| Abstract: | Metal‐free ring‐opening oligomerization of glycidyl phenyl ether (GPE) initiated with tetra‐n‐butylammonium fluoride (n‐Bu4NF) (5.0 mol %) was performed in the presence of poly(ethylene glycol) monomethyl ether (PEGM) (5.0, 10, 20 mol %) as a chain transfer agent, by which the resulting polymers having narrow molecular weight distribution (Mw/Mn < 1.2) were obtained in 80–84% yield. Solubility of the obtained polymers in water increased with the increase of amount of PEGM, owing to an increase of number of PEGM‐block‐oligo(GPE) molecules compared to that of oligo(GPE) molecules having FCH2– group at the initiating end as well as a decrease in degree of oligomerization of oligo(GPE). The PEGM‐block‐oligo(GPE) was isolated by filtration of the polymer aqueous solution, whose number‐average molecular weights determined by NMR spectroscopic analysis were almost consistent to the theoretical values. The PEGM‐block‐oligo(GPE) formed micelles in aqueous media, whose average particle diameter was 58 and 140 nm for the copolymers having a composition of PEGM:GPE = 62:38 and 53:47, respectively. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4451–4458 |
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| Keywords: | amphiphiles block copolymers epoxides metal‐free polymerization ring‐opening polymerization |
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