Journal
ACS MACRO LETTERS
Volume 3, Issue 8, Pages 732-737Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz5003867
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Funding
- Hasselt University via the BOF funds
- FWO Odysseus scheme
- European Science Foundation - Precision Polymer Materials (P2M)
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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.
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