Titlebar

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

 

Correlation of the melt rheological properties with the foaming behavior of immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether) and poly(styrene-co-acrylonitrile)

Title data

Ruckdäschel, Holger ; Rausch, Julius ; Sandler, Jan K. W. ; Altstädt, Volker ; Schmalz, Holger ; Müller, Axel H. E.:
Correlation of the melt rheological properties with the foaming behavior of immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether) and poly(styrene-co-acrylonitrile).
In: Polymer Engineering and Science. Vol. 48 (November 2008) Issue 11 . - pp. 2111-2125.
ISSN 1548-2634
DOI: https://doi.org/10.1002/pen.21100

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether)/poly(styrene-co-acrylonitrile) (PPE/SAN) were batch-foamed using CO2 as a blowing agent as a function of foaming temperature, foaming time, and blend composition. Evaluation of the resulting cellular morphology revealed an enhanced foamability of SAN with PPE contents up to 20 wt% as indicated by a similar volume expansion but a significantly reduced mean cell size. This behavior is related to a heterogeneous nucleation activity by the dispersed PPE phase. A further increasing PPE content, however, leads to increasing foam densities as well as nonuniform foam morphologies. The changes in the foaming behavior can be correlated with the melt rheological properties and the corresponding blend morphology. Shear-rheological investigations revealed an onset of percolation of the dispersed PPE phase between 20 and 40 wt%, and a transition towards cocontinuity at 60 wt%. The materials response under uniaxial elongational flow, as assessed by Rheotens measurements, revealed an increase in elongational viscosity scaling with the PPE content, similar to the shear data. However, the strain hardening behavior was reduced by increasing PPE contents and, at 20 wt%, the drawability revealed a significant drop-both phenomena limiting the foamability of polymers. In summary, the present study discusses fundamental aspects of foaming immiscible PPE/SAN blends.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: SUPERCRITICAL CARBON-DIOXIDE; GLASS-TRANSITION PARTICLES; MICROCELLULAR FOAMS; HETEROGENEOUS NUCLEATION; ELONGATIONAL VISCOSITY; CELLULAR STRUCTURE; POLYSTYRENE FOAMS; POLYMER MELTS; RHEOTENS TEST; POLYPROPYLENE
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: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 15 Apr 2015 06:31
Last Modified: 15 Apr 2015 06:31
URI: https://eref.uni-bayreuth.de/id/eprint/10087