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Morphology, surface structure, and elastic properties of PBT-based copolyesters with PEO-b-PEB-b-PEO triblock copolymer soft segments

Title data

Schmalz, Holger ; van Guldener, Viola ; Gabrielse, Wouter ; Lange, Ronald ; Abetz, Volker:
Morphology, surface structure, and elastic properties of PBT-based copolyesters with PEO-b-PEB-b-PEO triblock copolymer soft segments.
In: Macromolecules. Vol. 35 (2 July 2002) Issue 14 . - pp. 5491-5499.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma011995o

Official URL: Volltext

Abstract in another language

The elasticity of commonly known poly(butylene terephthalate)-poly(tetramethylene oxide) (PBT-PTMO)-based copoly(ether ester)s is increased by replacement of PTMO soft segments with polyethylene oxide)-block-poly(ethylene-stat-butylene)-block-polyethylene oxide) (PEO-b-PEB-b-PEO) triblock copolymer soft segments containing a nonpolar middle block based on hydrogenated polybutadiene (PEB). The incorporation of this strongly incompatible PEB block resulted in the aimed increased phase separation between the PBT hard blocks and the soft segment phase, leading to a disperse PBT phase and hence to an increased elasticity. Dynamic shear experiments in combination with small-angle X-ray scattering revealed that crystallization of the PBT hard segments occurs from a microphase-separated melt. The resulting dispersed PBT hard phase in these materials is shown using transmission electron microscopy (TEM) and scanning force microscopy (SFM), whereas the increased elasticity is demonstrated using mechanical characterization. Hysteresis measurements reveal that the plastic deformation after recovery from 100% strain is only 1-6% (depending on composition) for the new PEB-containing copolyesters compared to 33% for a PBT-PTMO-based copoly(ether ester). The combination of results obtained with differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) points toward a complex morphology for the PEB-containing copolyesters. Five different phases exist: a crystalline pure PBT phase, pure amorphous PEB, and PBT phases and a PEO-rich phase besides an amorphous mixed PEO/PBT phase.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000176535600027
Keywords: ISOPRENE BLOCK-COPOLYMERS; THERMOPLASTIC ELASTOMERS; MICROPHASE SEPARATION; RHEOLOGY; DIBLOCK; TRANSITION; ESTER
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 06:42
Last Modified: 16 Apr 2015 06:42
URI: https://eref.uni-bayreuth.de/id/eprint/10412