Development of wear-resistant thermoplastic polyurethanes by blending with poly(dimethyl siloxane). II: a packing model

Bremner, T., Hill, D. J. T., Killeen, M. I., O'Donnell, J. H., Pomery, P. J., St. John, D. and Whittaker, A. K. (1997) Development of wear-resistant thermoplastic polyurethanes by blending with poly(dimethyl siloxane). II: a packing model. Journal of Applied Polymer Science, 65 5: 939-950. doi:10.1002/(SICI)1097-4628(19970801)65:5<939::AID-APP12>3.0.CO;2-N


Author Bremner, T.
Hill, D. J. T.
Killeen, M. I.
O'Donnell, J. H.
Pomery, P. J.
St. John, D.
Whittaker, A. K.
Title Development of wear-resistant thermoplastic polyurethanes by blending with poly(dimethyl siloxane). II: a packing model
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 1097-4628
0021-8995
Publication date 1997-08-01
Sub-type Article (original research)
DOI 10.1002/(SICI)1097-4628(19970801)65:5<939::AID-APP12>3.0.CO;2-N
Volume 65
Issue 5
Start page 939
End page 950
Total pages 12
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Formatted abstract
It has been shown in a previous article that melt blending of low levels of commercial poly(dimethyl siloxane) (PDMS) fluid with commercial thermoplastic polyurethanes has a significant positive impact on the coefficient of friction (CoF) and on the mechanical and wear properties of the polyurethanes. The improvements in CoF and wear resistance were expected due to surface modification of the polymer; however, the improvements in the mechanical properties were much more significant than expected. Evidence presented in the earlier publication suggests that the changes in the wear and mechanical properties are not due to surface modification alone, but are largely due to modification of the bulk by PDMS. In this article a model is presented that accounts for the observed relationship between PDMS content and the properties of the blends. It is proposed that the addition of PDMS facilitates an improved packing efficiency (antiplasticization) in the polyurethane soft domain, leading to improved material performance. Beyond an optimum PDMS concentration of 1.5-2.0%, phase separation of PDMS becomes significant, plasticization sets in, and mechanical properties then begin to diminish rapidly. This model has been rigorously investigated and has proven to be highly robust. (C) 1997 John Wiley & Sons, Inc.
Keyword Polymer Science
Polyurethane
Poly(dimethyl Siloxane)
Wear
Plasticization
Blend
Copolymers
Polysiloxane
Polyethylene
Elastomers
NMR
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Advanced Imaging Publications
 
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Created: Tue, 14 Aug 2007, 02:52:37 EST