Soldera - polyacs

FLUOROPOLYMER 2014
October 13-16, 2014
Omni Hotel * San Diego, California USA
Lecture 17
Impact of Regiospecific Defects on Phase Transitions of PVDF
Nasim Anousheh, François Godey, Armand Soldera
Centre Québécois des Matériaux Fonctionnels, Département de Chimie, Université de
Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada
Depending on how the polymerization of poly(vinylidene) fluoride (PVDF) is proceeded,
percentages of defects resulting from variations in regioisomerism can greatly vary.
Thanks to the use of efficient calculation codes and computing resources, it is possible to
reveal their molecular effects on the overall properties. Melting and the glass transitions
are specifically regarded in this presentation. The revealing of the impact of a defect on
the surface of a nanocrystal, or inside it, is discussed with regards to the Gibbs-Thomson
equation and the stability of the crystal phase. How glass transition is affected by defects
is also envisioned. After showing that the behavior of the glass transition temperature (Tg)
is accurately depicted, molecular reasons that give rise to this variation can be gained.
Unveiling the local dynamics through a picture of the change in the energy landscape
brought by the defects can thus be undertaken.