Stereodynamic control of star-epoxy/anhydride crosslinking actuated by liquid-crystalline phase transitions.
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 Eαof 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.
Université Côte d'Azur, Institut de Chimie de Nice, UMR CNRS 7272, 06108 Nice cedex 02, France. jeanmathieu.pin@gmail.com Nicolas.SBIRRAZZUOLI@unice.fr.
Jean-Mathieu
http://orcid.org/0000-0002-3240-8700
JM
Pin
Université Côte d'Azur, Institut de Chimie de Nice, UMR CNRS 7272, 06108 Nice cedex 02, France. jeanmathieu.pin@gmail.com Nicolas.SBIRRAZZUOLI@unice.fr.
Alice
A
Mija
Université Côte d'Azur, Institut de Chimie de Nice, UMR CNRS 7272, 06108 Nice cedex 02, France. jeanmathieu.pin@gmail.com Nicolas.SBIRRAZZUOLI@unice.fr.
Nicolas
N
Sbirrazzuoli