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Coloquio ICF_ HOY
- To: acad@xxxxxxxxxxxxx, acad@xxxxxxxxxxx, academicos@xxxxxxxxxxxxxxx, ests@xxxxxxxxxxx, estudiantes@xxxxxxxxxxxxxxx, kcedano@xxxxxxxxxxxxxxx
- Subject: Coloquio ICF_ HOY
- From: "Ing. Adriana Reyes Mayer" <a_mayer@xxxxxxxxxxxxxx>
- Date: Wed, 10 Aug 2011 10:02:41 -0600
- Cc: "Bonifacio Tenorio" <boni_alvarado@xxxxxxxxxxx>,"Edgar Castillo" <im.e.castillo@xxxxxxxxxxx>,"Estefanía Huitrón" <ehrattinger@xxxxxxxxx>,"Fis. Maraolina Domínguez" <jupiterjess@xxxxxxxxxxx>,"Haydee Vargas" <eedyah_sawamura@xxxxxxxxxxx>,"Heriberto Villanueva Pliego" <iluminatis_50@xxxxxxxxxxx>, "Ing. Agustín Parada" <parada@xxxxxxxxxxxxxxx>,"Martín Cortes" <matagatos_69@xxxxxxxxxxx>,"Mireya Hernández" <chispa_5_5@xxxxxxxxxxx>,"Rubén Castillo" <kstper@xxxxxxxxxxx>
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- Delivered-to: acad@xxxxxxxxxxx
- Delivery-date: Wed, 10 Aug 2011 11:02:52 -0500
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- In-reply-to: <20110803160452.M26812@xxxxxxxxxxxxxx>
- Priority: urgent
- References: <20110621024241.M97338@xxxxxxxxxxxxxx> <20110627152324.M45599@xxxxxxxxxxxxxx> <20110629163732.M8551@xxxxxxxxxxxxxx> <20110803160452.M26812@xxxxxxxxxxxxxx>
***
Se les invita al COLOQUIO del ICF
HOY Miércoles 10-agosto-2011
5:30 PM
AUDITORIO DEL ICF
"Comparative kinetic study and microwaves non thermal effects on the
formation of poly(amic acid) 4,4′-(Hexafluoroisopropylidene)diphthalic
anhydride (6FDA) and 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)
dianiline (BAPHF). Reaction activated by Microwave, Ultrasound and
Conventional heating."
Dr. Joaquín Palacios Alquisira
Fac. de Química ? Universidad Nacional Autónoma de México
Abstract
Kinetic behavior and non thermal effect of poly(amic acid) synthesized from
4,4′-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA) dianhydride and
4,4′-(Hexafluoroisopropylidene) bis (p-phenyleneoxy) dianiline (BAPHF)
diamine in microwave transparent p-dioxane solvent at low temperature of 30,
50, 70 ºC were studied, under conventional heating (CH), microwave (MW) and
ultrasound irradiation (US). Results shows that the polycondensation rate
decreases in the next order MW> US >CH and that the increased rates observed
with US and MW are due to decreased activation energies of the Arrhenius
equation. Rate constant for a chemical process activated by conventional
heating declines proportionally as the induction time increases, however,
this behavior is not observed under microwave and ultrasound activation. We
can say that in addition to the thermal microwave effect, a non thermal
microwave effect is present in the system.
Atentamente.
Dr A Romo Uribe & Dr J Hernandez Cobos
Organizadores del Coloquio del ICF