Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites

Finnigan, B., Halley, P., Jack, K., McDowell, A., Truss, R., Casey, P., Knott, R. and Martin, D. (2006) Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites. Journal of Applied Polymer Science, 102 1: 128-139. doi:10.1002/app.23347


Author Finnigan, B.
Halley, P.
Jack, K.
McDowell, A.
Truss, R.
Casey, P.
Knott, R.
Martin, D.
Title Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 0021-8995
1097-4628
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1002/app.23347
Volume 102
Issue 1
Start page 128
End page 139
Total pages 12
Editor Eric Swanson
Place of publication New York, U.S.A.
Publisher Wiley
Language eng
Subject C1
291401 Polymers
670704 Plastics in primary forms
0303 Macromolecular and Materials Chemistry
0904 Chemical Engineering
0912 Materials Engineering
Abstract Two organically modified layered silicates (with small and large diameters) were incorporated into three segmented polyurethanes with various degrees of microphase separation. Microphase separation increased with the molecular weight of the poly(hexamethylene oxide) soft segment. The molecular weight of the soft segment did not influence the amount of polyurethane intercalating the interlayer spacing. Small-angle neutron scattering and differential scanning calorimetry data indicated that the layered silicates did not affect the microphase morphology of any host polymer, regardless of the particle diameter. The stiffness enhancement on filler addition increased as the microphase separation of the polyurethane decreased, presumably because a greater number of urethane linkages were available to interact with the filler. For comparison, the small nanofiller was introduced into a polyurethane with a poly(tetramethylene oxide) soft segment, and a significant increase in the tensile strength and a sharper upturn in the stress-strain curve resulted. No such improvement occurred in the host polymers with poly(hexamethylene oxide) soft segments. It is proposed that the nanocomposite containing the more hydrophilic and mobile poly(tetramethylene oxide) soft segment is capable of greater secondary bonding between the polyurethane chains and the organosilicate surface, resulting in improved stress transfer to the filler and reduced molecular slippage. (c) 2006 Wiley Periodicals, Inc.
Keyword Polymer science
Morphology
Nanoparticles
Polyurethanes
Structure-property relations
Polymer/layered Ssilicate nanocomposites
Multiple endothermic behavior
Angle neutron-scattering
X-ray-scattering
Block copolymers
Mechanical-properties
Layered silicates
Saxs-dsc
Elastomers
Polymers
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 20:45:32 EST