Modification of a hydrophilic linear polyurethane by crosslinking with a polydimethylsiloxane. Influence of the crosslink density and of the hydrophobic/hydrophilic balance on the water transport properties

A hydrophilic thermoplastic polyurethane (TPU) was modified by reactive extrusion to obtain in a first step a grafted and soluble material and to finally form by a hydrolysis condensation process a weakly crosslinked network. Different isocyanates were used as grafting agents and a α,ω‐dihydroxypoly...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2006-01, Vol.44 (1), p.48-61
Main Authors: Dolmaire, N., Méchin, F., Espuche, E., Pascault, J. P.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
Chemical Sciences
Crosslinking, vulcanization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers
reactive extrusion
thermomechanical properties
water sorption
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Summary:A hydrophilic thermoplastic polyurethane (TPU) was modified by reactive extrusion to obtain in a first step a grafted and soluble material and to finally form by a hydrolysis condensation process a weakly crosslinked network. Different isocyanates were used as grafting agents and a α,ω‐dihydroxypoly(dimethylsiloxane) (PDMS) was used to modify the hydrophilic/hydrophobic balance of the material and the chain length between the crosslinks. The influence of the isocyanate functionality and of the PDMS content were studied on the network formation and on the thermomechanical and water sorption properties. The networks properties were also compared with those of a TPU/PDMS blend. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 48–61, 2006
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.20675