Epoxy polymers: Glass transition/cure degree correlation |
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Authors: | A Schiraldi P Baldini E Pezzati |
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Institution: | (1) Dipartimento di Chimica Fisica, Università di Pavia, Viale Taramelli 16, 27100 Pavia;(2) Centro di Studio per la Termodinamica Ed Elettrochimica Dei Sistemi Salini Fusi E solidi del Cnr, c/o Dipartimento di Chimica Fisica, Università di PaVia, Italy |
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Abstract: | The correlation between the glass transition temperature,T
g
, and the cure degree, , of epoxy polymers has been analysed on the basis of an extension of the Vogel-Tamman-Fulcher equation for the viscosity of polymers and glasses.A physical meaning has been given to the coefficients of the series expansion of the functionT
g=T
g
( ).This analysis allows one to verify that the experimental (T
g
, ) data support the conclusion that, in the case of thermoset polymers, the ideal glass transition temperature,T
o, appearing in the VTF equation, is larger thanT
g
.This conclusion may be supported by the thermodynamic interpretation ofT
0
as the temperature at which the excess entropy of the systems tends to vanish: in the case of partially cured thermosets;T
0
would represent the minimum temperature at which the system becomes able to enhance its cure degree.
Zusammenfassung Die Korrelation zwischen der Glasumwandlungs-temperaturT
g
und dem Aushärtungsgrad von Epoxidpolymeren wurde analysiert, und zwar basierend auf einer Erweiterung der Vogel-Tamman-Fulcher-Gleichung für die Viskosität von Polymeren und Gläsern. Den bei der Reihenentwicklung der FunktionT
g
=T
g
( ) auftretenden Koeffizienten wurde eine physikalische Bedeutung zugeschrieben. Diese Analyse ermöglicht nachzuweisen, daß die experimentellen Daten (T
g
), die Schlußfolgerung stützen, daß im Falle von hitzehärtbaren Polymeren die in der VTF-Gleichung auftretende sogenannte ideale GlasumwandlungstemperaturT
0 höher alsT
g
ist. Diese Konklusion wird auch durch die thermodynamische Interpretation vonT
0 gestützt, nämlich als die Temperatur, bei der die Überschußentropie des Systems gegen Null geht: im Falle von teilweise ausgehärteten hitzehärtbaren Polymeren würdeT
0 die minimale Temperatur darstellen, bei der eine Erhöhung des Aushärtungsgrades des Systems einsetzt.
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g
![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![yucy](/content/w782322323h5686m/xxlarge1102.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) , ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![softcy](/content/w782322323h5686m/xxlarge1100.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) T
0, ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![yacy](/content/w782322323h5686m/xxlarge1103.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![yacy](/content/w782322323h5686m/xxlarge1103.gif) ![yucy](/content/w782322323h5686m/xxlarge1102.gif) ![shchcy](/content/w782322323h5686m/xxlarge1097.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![yacy](/content/w782322323h5686m/xxlarge1103.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![Vcy](/content/w782322323h5686m/xxlarge1042.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![gcy](/content/w782322323h5686m/xxlarge1075.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) -![Tcy](/content/w782322323h5686m/xxlarge1058.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) - ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![softcy](/content/w782322323h5686m/xxlarge1100.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) , ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![shcy](/content/w782322323h5686m/xxlarge1096.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) T
g
. ![Ecy](/content/w782322323h5686m/xxlarge1069.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![yucy](/content/w782322323h5686m/xxlarge1102.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![zhcy](/content/w782322323h5686m/xxlarge1078.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![zhcy](/content/w782322323h5686m/xxlarge1078.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tscy](/content/w782322323h5686m/xxlarge1094.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) T
0, ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) , ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![bcy](/content/w782322323h5686m/xxlarge1073.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ecy](/content/w782322323h5686m/xxlarge1101.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) . ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ,T
0 ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![dcy](/content/w782322323h5686m/xxlarge1076.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![yacy](/content/w782322323h5686m/xxlarge1103.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![softcy](/content/w782322323h5686m/xxlarge1100.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) , ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![rcy](/content/w782322323h5686m/xxlarge1088.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![mcy](/content/w782322323h5686m/xxlarge1084.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![yacy](/content/w782322323h5686m/xxlarge1103.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![ocy](/content/w782322323h5686m/xxlarge1086.gif) ![bcy](/content/w782322323h5686m/xxlarge1073.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ycy](/content/w782322323h5686m/xxlarge1099.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![vcy](/content/w782322323h5686m/xxlarge1074.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![chcy](/content/w782322323h5686m/xxlarge1095.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![scy](/content/w782322323h5686m/xxlarge1089.gif) ![tcy](/content/w782322323h5686m/xxlarge1090.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![pcy](/content/w782322323h5686m/xxlarge1087.gif) ![iecy](/content/w782322323h5686m/xxlarge1077.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![ucy](/content/w782322323h5686m/xxlarge1091.gif) ![lcy](/content/w782322323h5686m/xxlarge1083.gif) ![kcy](/content/w782322323h5686m/xxlarge1082.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![ncy](/content/w782322323h5686m/xxlarge1085.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) ![zcy](/content/w782322323h5686m/xxlarge1079.gif) ![acy](/content/w782322323h5686m/xxlarge1072.gif) ![tscy](/content/w782322323h5686m/xxlarge1094.gif) ![icy](/content/w782322323h5686m/xxlarge1080.gif) .
Work supported by the Progetto Finalizzato Chimica Fine e Secondaria of the Italian C.N.R., grant No. 84.01304.95 |
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Keywords: | |
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