Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Synthesis and characterization of polystyrene-b-poly(ethylene oxide)-b-poly(epsilon-caprolactone) block copolymers

Title data

Arnal, M. L. ; Balsamo, V. ; López-Carrasquero, F. ; Contreras, J. ; Carrillo, M. ; Schmalz, Holger ; Abetz, Volker ; Laredo, E. ; Müller, Alejandro J.:
Synthesis and characterization of polystyrene-b-poly(ethylene oxide)-b-poly(epsilon-caprolactone) block copolymers.
In: Macromolecules. Vol. 34 (6 November 2001) Issue 23 . - pp. 7973-7982.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma011058g

Official URL: Volltext

Abstract in another language

The preparation of polystyrene-b-poly(ethylene oxide)-b-poly(epsilon -caprolactone) triblock copolymers using three different strategies is described. Experimentally, a method we have called ``thermal'' is the simplest one of the three employed. However, it presents serious limitations for the preparation of high molecular weight triblock copolymers with low polydispersity. The titration method is a more elegant alternative to prepare the PS-b-PEO-b-PCL triblock copolymers. Nevertheless, the stoichiometric titration of the precursor terminal hydroxyl groups requires much expertise, and it becomes more difficult as the concentration of such terminal groups decreases when the precursor molecular weight increases. Finally, the sequential method may be regarded as the most convenient one. However, the experimental steps involved a solvent exchange during polymerization that must be performed under conditions of strict purity and high vacuum. Several triblock and pentablock copolymers of varying compositions and molecular weights were successfully prepared. The fact that these copolymers contain two crystallizable blocks, i.e., PEO and PCL, makes them very interesting from a structural point of view. The copolymers were found to be phase segregated according to evidence provided by DSC and WAXS. The crystallization and melting behavior of both PEO and PCL blocks is greatly affected by composition. Fractionated crystallization phenomena were detected when either one or both blocks constituted the minor components within the block copolymers.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000171981500011
Keywords: ABC TRIBLOCK COPOLYMER; OXIDE) DIBLOCK COPOLYMERS; EPSILON-CAPROLACTONE; POLY(ETHYLENE OXIDE); FRACTIONATED CRYSTALLIZATION; MORPHOLOGY; POLYSTYRENE; POLY(EPSILON-CAPROLACTONE); POLYMERIZATION; BEHAVIOR
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 16 Apr 2015 07:24
Last Modified: 16 Apr 2015 07:24
URI: https://eref.uni-bayreuth.de/id/eprint/10416