Stereodynamic control of star-epoxy/anhydride crosslinking actuated by liquid-crystalline phase transitions. - Archive ouverte HAL
Article Dans Une Revue Soft Matter Année : 2017

Stereodynamic control of star-epoxy/anhydride crosslinking actuated by liquid-crystalline phase transitions.

Jean-Mathieu Pin
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Alice Mija
Nicolas Sbirrazzuoli

Résumé

The epoxy/anhydride copolymerization kinetics of an original star-epoxy monomer (TriaEP) was explored in dynamic heating mode using a series of isoconversional methods. Negative values of the apparent activation energy (Eα) related to an anti-Arrhenius behavior were observed. The transition from Arrhenius to anti-Arrhenius behavior and vice versa depending on the Eα of polymerization was correlated with the dynamics of mesophasic fall-in/fall-out events, physically induced transition (PIT) and chemically induced transition (CIT). This self-assembly phenomenon induces the generation of an anisotropic crosslinked architecture exhibiting both nematic discotic (ND) and nematic columnar (NC) organization. Particular emphasis was placed on evaluating the juxtaposition/contribution of the liquid-crystalline transitions to crosslinking, considering both the reaction dynamics and the macromolecular vision.

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Chimie
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Dates et versions

hal-01588506 , version 1 (15-09-2017)

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Jean-Mathieu Pin, Alice Mija, Nicolas Sbirrazzuoli. Stereodynamic control of star-epoxy/anhydride crosslinking actuated by liquid-crystalline phase transitions.. Soft Matter, 2017, ⟨10.1039/c6sm02624a⟩. ⟨hal-01588506⟩
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