pH-Responsive diblock copolymers prepared by the dual initiator strategy

Bernaerts, Katrien V.; Willet, Nicolas; Van Camp, Wim; Jérôme, Robert; Du Prez, Filip E.

doi:10.1021/ma052625t

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Article (Scientific journals)

pH-Responsive diblock copolymers prepared by the dual initiator strategy

Bernaerts, Katrien V.; Willet, Nicolas; Van Camp, Wim et al.

2006 • In Macromolecules, 39 (11), p. 3760-3769

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/5251

DOI
10.1021/ma052625t

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Keywords :

block copolymer

Abstract :

[en] Diblock copolymers poly(tetrahydrofuran-b-tert-butyl acrylate) (PTHF-b-PtBA) and poly(tetrahydrofuranb- 1-ethoxyethyl acrylate) (PTHF-b-PEEA) were successfully synthesized by the dual initiator 4-hydroxybutyl-2- bromoisobutyrate (HBBIB). The isobutyrate and alcohol function of HBBIB were used for the atom transfer radical polymerization of tBA ( or EEA) and the living cationic ring-opening polymerization of THF, respectively. Hydrolysis or thermolysis of the aforementioned diblock copolymers results in amphiphilic pH-responsive copolymers PTHF-b-poly( acrylic acid) ( PTHF-b-PAA). Matrix-assisted laser desorption/ ionization time-of-flight (MALDI-TOF) and nuclear magnetic resonance spectroscopy (H-1 NMR) were used to analyze the PTHF macroinitiator, while clear evidence for the formation of well-defined block copolymer structures was obtained by 1H NMR, gel permeation chromatography (GPC), and infrared spectroscopy (FT-IR). The amorphous PtBA block in PTHF-b-PtBA resulted in a decrease of the crystallinity and the melting point of PTHF, as shown by differential scanning calorimetry (DSC). Self-assembly of PTHF-b-PAA copolymers in water into aggregates and micelles when exposed to specific pH values was confirmed by dynamic light scattering, infrared, and NMR spectroscopies.

Research Center/Unit :

Center for Education and Research on Macromolecules (CERM)

Disciplines :

Chemistry
Materials science & engineering

Author, co-author :

Bernaerts, Katrien V.; University of Ghent > Department of Organic Chemistry > Polymer Chemistry Research Group

Willet, Nicolas ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Van Camp, Wim; University of Ghent > Department of Organic Chemistry > Polymer Chemistry Research Group

Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Du Prez, Filip E.; University of Ghent > Department of Organic Chemistry > Polymer Chemistry Research Group

Language :

English

Title :

pH-Responsive diblock copolymers prepared by the dual initiator strategy

Publication date :

30 May 2006

Journal title :

Macromolecules

ISSN :

0024-9297

eISSN :

1520-5835

Publisher :

Amer Chemical Soc, Washington, United States - Washington

Volume :

Issue :

Pages :

3760-3769

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/pdf/10.1021/ma052625t

Funders :

FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen
BELSPO - Service Public Fédéral de Programmation Politique scientifique
IWT - Agency for Innovation by Science and Technology

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since 30 January 2009

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