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Journal articles
Dynamic molecular mobility of polyurethane by a broad range dielectric and mechanical analysis
Abstract : The dynamic molecular mobility of poly(2-hydroxypropyl methacrylate) (PHPMA) base polyurethane (PU) was
studied over a broad range of frequency and temperature by combining dynamic dielectric spectroscopy and
dynamic mechanical analysis. Two hydrated levels were considered in this study: dry and room humidity states.
In dry state, two secondary relaxations γ and β are identified. And in room humidity state, a βsw mode is pointed
out. These modes are well known in poly(hydroxylalkyl methacrylate)s. The main α relaxation is influenced by
humidity and crosslinks. The Kramers-Kronig transform is used to reveal an ionic conductivity σionic. Relaxation
times extracted from dielectric and mechanical analyses are coherent for PU and PHPMA. This correlation allows
us to propose an interpretation of relaxations at a molecular level.
Cited literature [60 references]
https://hal.archives-ouvertes.fr/hal-01537201
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, June 12, 2017 - 2:39:28 PM
Last modification on : Wednesday, January 6, 2021 - 10:54:03 AM
Long-term archiving on: : Thursday, September 14, 2017 - 12:35:38 PM
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, June 12, 2017 - 2:39:28 PM
Last modification on : Wednesday, January 6, 2021 - 10:54:03 AM
Long-term archiving on: : Thursday, September 14, 2017 - 12:35:38 PM
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