Coalescence in blends of thermoplastic polyurethane and polyolefins

Katrin Wallheinke, Petra Poetschke, Cristopher W. Macosko, Herbert Stutz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The coalescence behavior of immiscible blends was determined by annealing in the melt without applying shear. The kinetics and the process of coalescence were observed for blends of thermoplastic polyurethane (TPU) and polyolefins. Two different types of measurements were used to observe coalescence in quiescent melt at processing temperature. On one hand, the blends granules were annealed in bulk in a metal bath. The resulting particles sizes were determined by light microscopy and by SEM on particles separated from the blend. On the other hand, thin sections of the samples were annealed on a hot stage. Coalescence was observed in situ using a light microscope or by static laser light scattering. It was observed that the higher viscosity ratio between polyethylene and TPU leads to a more pronounced coarsening of the morphology of 80/20 blends than in TPU/polypropylene. It was shown that the process of reshaping coalescence is one mechanism of coalescence that takes place in quiescent melt. Another mechanism that was observed directly is a `domino effect' in which one coalescence process causes the next one.

Original languageEnglish (US)
Title of host publicationTechnical Papers, Regional Technical Conference - Society of Plastics Engineers
Editors Anon
PublisherSoc Plast Eng
Pages509-544
Number of pages36
StatePublished - Dec 1 1997
EventProceedings of the 1997 International Symposium on Polymer Blends, Alloys and Filled Systems, POLYBLENDS - Boucherville, Can
Duration: Oct 9 1997Oct 10 1997

Other

OtherProceedings of the 1997 International Symposium on Polymer Blends, Alloys and Filled Systems, POLYBLENDS
CityBoucherville, Can
Period10/9/9710/10/97

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