Titlebar

Bibliografische Daten exportieren
Literatur vom gleichen Autor
plus auf ERef Bayreuth
plus bei Google Scholar

 

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

Titelangaben

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. Bd. 34 (6 November 2001) Heft 23 . - S. 7973-7982.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma011058g

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: ISI:000171981500011
Keywords: ABC TRIBLOCK COPOLYMER; OXIDE) DIBLOCK COPOLYMERS; EPSILON-CAPROLACTONE; POLY(ETHYLENE OXIDE); FRACTIONATED CRYSTALLIZATION; MORPHOLOGY; POLYSTYRENE; POLY(EPSILON-CAPROLACTONE); POLYMERIZATION; BEHAVIOR
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Profilfelder
Profilfelder > Advanced Fields
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 16 Apr 2015 07:24
Letzte Änderung: 16 Apr 2015 07:24
URI: https://eref.uni-bayreuth.de/id/eprint/10416