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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/17770

Title: Photoinduced Sequence-Controlled Copper-Mediated Polymerization: Synthesis of Decablock Copolymers
Authors: CHUANG, Ya-Mi
Issue Date: 2014
Citation: ACS MACRO LETTERS, 3 (8), p. 732-737
Abstract: Photoinitiated copper-mediated radical polymerization offers an one-pot and time efficient method of preparing a decablock copolymer PMA-PtBA-PMA-PDEGA-PMA-PtBA-PMA-PDEGA-PnBA-PDEGA with an overall molecular weight of 8500 g.mol(-1). The molecular weight is in close agreement with theoretical expectations and significantly narrow dispersities (D = 1.1-1.17) are achieved for the various block extensions. The tert-butyl group of the decadeblock was deprotected to form PMA-PAA-PMA-PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA. The deprotection is confirmed by the disappearance of tert-butyl signal and the loss of molecular weight investigated by H-1 NMR and SEC, respectively. The carboxylic group of PAA is protonated in acidic solution (water insoluble) and deprotonated in basic solution (water-soluble). This enables a conformational change of PMA-PAA-PMA-PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA in water/ethanol mixture (80/20%v/v), as is demonstrated by a turbid solution at pH 2 and transparent solutions at pH 10.
Notes: [Chuang, Ya-Mi; Junkers, Thomas] Hasselt Univ, Inst Mat Res, Polymer React Design Grp, B-3590 Diepenbeek, Belgium. [Chuang, Ya-Mi; Ethirajan, Anitha] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Junkers, Thomas] IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/17770
DOI: 10.1021/mz5003867
ISI #: 000340701900008
ISSN: 2161-1653
Category: A1
Type: Journal Contribution
Validation: ecoom, 2015
Appears in Collections: Research publications

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