New bio-based thermoplastic polyurethane elastomers from isosorbide and rapeseed oil derivatives
Résumé
Thermoplastic polyurethanes (TPUs) from fatty acids dimer-based polyester polyols, 4,4′-methylene bis(phenyl
isocyanate) (MDI) and isosorbide (ISO) as chain extender were successfully synthesized by a two-stage synthesis.
TPUs obtained from isosorbide were compared to the model 1,4-butanediol (BDO) −based materials.
Differential scanning calorimetry revealed the phase-separated structure of these materials that displayed a
typical thermoplastic elastomer behavior by dynamic mechanical analysis. Samples were further analyzed by
transmission electronic microscopy, atomic force microscopy and compression set; hardness and water uptake
were also monitored. Isosorbide was found to slightly increase the glass transition and melting temperatures of
MDI-based hard segments, and to slightly decrease the stability and quality of phase segregation. This resulted in
an increase in rubber modulus and hardness, shape retention, in a slight increase in the temperature of the α
relaxation of the soft segment domains and in a characteristic microphase morphology. Moreover the use of the
rather hydrophobic fatty acid-based soft segment allowed to keep the water uptake at a rather low level, in spite
of the presence of isosorbide in the formulation.
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New bio-based TPU elastomers from isosorbide & rapeseed oil derivatives Blache 2018.pdf (6.06 Mo)
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