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Article Dans Une Revue Polymer Année : 2020

Linear and nonlinear viscoelastic properties of segmented silicone-urea copolymers: Influence of the hard segment structure

Résumé

The linear and non-linear viscoelastic behaviors of 5 segmented silicone copolymers-with low fraction of 1,6-hexamethylene diisocyanate (HDI), 4,4'-methylenebis(cyclohexyl isocyanate) (HMDI), 1,3-bis(1-isocyanato-1-methylethyl)benzene (TMXDI), 2,4-tolylene diisocyanate (TDI) or isophorone diisocyanate (IPDI) as hard segments (HS)-are compared, in relation with their microstructure. When the HS are non-symmetrical, the materials nanostructuration is weak and has a limited impact on the mechanical response: two mechanical relaxations occur after the α relaxation of the polydimethylsiloxane (PDMS), the first related to the "unfreezing" of the HS-HS bonds, and the second one to the sticky reptation of the polymer chains. Conversely, when the HS are symmetrical, their self-organization is favored and the long range ordering of the HS is possible. The materials are then semi-crystalline like, with a low crystallinity (due to the low weight percentage of HS) and their flow; possible above their melting temperature (Tm), depends also on the HS dynamics, which is the most rapid for HDI.

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Dates et versions

hal-02917165 , version 1 (21-09-2020)

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Guillaume Falco, Leo Simonin, Sandrine Pensec, Florent Dalmas, Jean-Marc Chenal, et al.. Linear and nonlinear viscoelastic properties of segmented silicone-urea copolymers: Influence of the hard segment structure. Polymer, 2020, 186, pp.122041. ⟨10.1016/j.polymer.2019.122041⟩. ⟨hal-02917165⟩
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