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Cosolvent fractionation of PMOXA-b-PDMS-b-PMOXA: Bulk separation of triblocks from multiblocks

Lörcher, Samuel and Meier, Wolfgang . (2016) Cosolvent fractionation of PMOXA-b-PDMS-b-PMOXA: Bulk separation of triblocks from multiblocks. European Polymer Journal.

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Official URL: http://edoc.unibas.ch/52930/

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Abstract

Challenges regarding the synthesis, purification, and characterization of the amphiphilic triblock copolymer poly(2-methyl-2-oxazoline)-block-polydimethylsiloxane-block-poly(2-methyl-2-oxazoline) (PMOXA-b-PDMS-b-PMOXA) are herein illustrated and discussed. A block copolymer (BCP) library was synthesised by cationic ring-opening polymerisation of 2-methyl-2-oxazoline on broadly and narrowly dispersed PDMS macroinitiators. The crude BCPs were fractioned by a newly developed cosolvent fractionation technique. With this it is possible to remove the side products of chain-transfer reactions, intrinsic to the polymerisation of 2-oxazolines. The obtained fractions were characterized by nuclear magnetic resonance, gel permeation chromatography and light scattering, revealing that the cosolvent fractionation separates multiblock copolymers from triblock copolymers. Self-assembly of the individual polymer fractions showed that the cosolvent fractionation is essential to yield polymersome forming triblock copolymers.
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Chemie > Makromolekulare Chemie (Meier)
UniBasel Contributors:Meier, Wolfgang P.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0014-3057
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:25 Jan 2017 09:59
Deposited On:25 Jan 2017 09:59

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