NDLI: Structure-Property Relationships of Thermoplastic Polyurethane Elastomers Based on Polycarbonate Diols

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Structure-Property Relationships of Thermoplastic Polyurethane Elastomers Based on Polycarbonate Diols

Content Provider	Semantic Scholar
Author	Eceiza, Arantxa Larrañaga, Maider Caba, Koro De La Kortaberria, Galder Marieta, Cristina Corcuera, Maria Angeles Mondragon, Iñaki
Copyright Year	2008
Abstract	The phase-separation behavior and mor- phology of polycarbonate-based polyurethanes were inves- tigated as a function of the soft-segment molecular weight and chemical structure and the 4,4 0 -diphenylmethane dii- socyanate/1,4-butanediol based hard-segment contents. Polarized optical microscopy and atomic force microscopy images showed that the surface morphologies changed as the soft-segment molecular weight and hard-segment con- tent varied and also when the sample preparation condi- tions were modified. An increase in the soft- and hard- segment lengths led to increased phase separation with respect to the lower molecular weight soft segment, and this showed an interlocked and connected morphology of intermixed soft and hard domains. The surface morphol- ogy of phase-separated polyurethanes with hard segments composed of more than four to five 4,4 0 -diphenylmethane diisocyanate units contained globular hard-segment domains formed by spherulites, in which the size and con- nectivity between the branched lamellae changed with the hard-segment size. Interlamellar areas related to the soft segment were seen in the spherulites. Variations in the hard-segment spherulites were observed for polyur- ethanes based on soft segments of different molecular weights. 2008 Wiley Periodicals, Inc. J Appl Polym Sci 108: 3092-3103, 2008
Starting Page	3092
Ending Page	3103
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1002/app.26553
Alternate Webpage(s)	http://www.sc.ehu.es/iawcacik/Ikerkuntza/publicaciones/2008JApplPolymSci.pdf
Alternate Webpage(s)	https://doi.org/10.1002/app.26553
Volume Number	108
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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