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http://hdl.handle.net/1942/17770
Title: | Photoinduced Sequence-Controlled Copper-Mediated Polymerization: Synthesis of Decablock Copolymers | Authors: | CHUANG, Ya-Mi ETHIRAJAN, Anitha JUNKERS, Tanja |
Issue Date: | 2014 | Publisher: | AMER CHEMICAL SOC | Source: | 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. | Document URI: | http://hdl.handle.net/1942/17770 | e-ISSN: | 2161-1653 | DOI: | 10.1021/mz5003867 | ISI #: | 000340701900008 | Rights: | © 2014 American Chemical Society. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2015 |
Appears in Collections: | Research publications |
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