Coalescence in blends of thermoplastic polyurethane with polyolefins.: An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00098VHX2
ISBN-13978B00098VHX7
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on June 1, 1999. The length of the article is 4941 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: The coalescence behavior of immiscible blends was determined by annealing the melt without shear. The kinetics and the mechanism 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 the processing temperature. On the one hand, the blend granules were annealed in bulk. The resulting particle sizes were determined by light microscopy and by SEM on particles separated from the blend. On the other hand, thin samples were annealed on a hot stage. Coalescence was observed in situ by light microscopy or static laser light scattering. It was found that the higher viscosity and elasticity ratios between polyethylene and TPU lead to a more pronounced coarsening of the morphology of 80/20 blends than in TPU/polypropylene. It has been shown that the process of reshaping coalescence is one mechanism of coalescence that occurs in quiescent melt. Another mechanism that was directly observed is a "domino effect" where one coalescence process causes the next one.
Citation Details
Title: Coalescence in blends of thermoplastic polyurethane with polyolefins.
Author: Katrin Wallheinke
Publication:Polymer Engineering and Science (Refereed)
Date: June 1, 1999
Publisher: Society of Plastics Engineers, Inc.
Volume: 39 Issue: 6 Page: 1022(1)
Distributed by Thomson Gale
From the author: The coalescence behavior of immiscible blends was determined by annealing the melt without shear. The kinetics and the mechanism 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 the processing temperature. On the one hand, the blend granules were annealed in bulk. The resulting particle sizes were determined by light microscopy and by SEM on particles separated from the blend. On the other hand, thin samples were annealed on a hot stage. Coalescence was observed in situ by light microscopy or static laser light scattering. It was found that the higher viscosity and elasticity ratios between polyethylene and TPU lead to a more pronounced coarsening of the morphology of 80/20 blends than in TPU/polypropylene. It has been shown that the process of reshaping coalescence is one mechanism of coalescence that occurs in quiescent melt. Another mechanism that was directly observed is a "domino effect" where one coalescence process causes the next one.
Citation Details
Title: Coalescence in blends of thermoplastic polyurethane with polyolefins.
Author: Katrin Wallheinke
Publication:Polymer Engineering and Science (Refereed)
Date: June 1, 1999
Publisher: Society of Plastics Engineers, Inc.
Volume: 39 Issue: 6 Page: 1022(1)
Distributed by Thomson Gale
