A thermal study on moisture absorption by epoxy composites |
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Authors: | G Flor G Campari-Vigano' R Feduzi |
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Institution: | (1) Dipartimento di Chimica Fisica Dell'Università di Pavia C.S.T.E. CNR, Viale Taramelli 16, 27100 Pavia, Italy |
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Abstract: | The water sorption kinetics of an epoxy matrix-carbon fiber composite with different degrees of polymerization was studied. It was observed that the diffusion coefficients, determined perpendicularly to the fiber direction, are increased by increasing the cure degree. Only a small portion of the bonded water is released when the specimen are heated to 200 °C.The effects of moisture on some properties of the composite were also investigated. TheT
g values determined on fully polymerized samples, show lowerings of 70 degrees; moreover, the plasticization power of the bonded water increases on decrease of the temperature of conditioning of the specimens.Finally, the water present in the matrix considerably reduces the thermal stability of the composite.
Zusammenfassung Es wurde die Wassersorptionskinetik eines Graphitfaserverbundstoffes auf Epoxymatrixbasis mit verschiedenen Polymerisationsgraden untersucht. Es zeigte sich, daß die senkrecht zur Faserrichtung bestimmten Diffusionskonstanten mit anwachsendem Vernetzungsgrad zunehmen. Beim Erhitzen des Materials auf 200 °C wird nur ein geringer Teil des gebundenen Wassers abgegeben. Der Einfluß des Feuchtgehaltes auf einige Eigenschaften des Verbundstoffes wurde ebenfalls untersucht. Die an vollkommen polymerisierten Proben bestimmtenT
g Werte zeigen eine Abnahme von 70 Grad; die Plastifizierungswirkung des gebundenen Wassers ist um so höher, je niedriger die Konditionierungstemperatur der Probe war. Das in der Matrix gegenwärtige Wasser senkt beträchtlich die Wärmebeständigkeit des Verbundstoffes.
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![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![chcy](/content/j4743234w16557v8/xxlarge1095.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) Tg, ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ycy](/content/j4743234w16557v8/xxlarge1099.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![softcy](/content/j4743234w16557v8/xxlarge1100.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ycy](/content/j4743234w16557v8/xxlarge1099.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![tscy](/content/j4743234w16557v8/xxlarge1094.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) , ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![zhcy](/content/j4743234w16557v8/xxlarge1078.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) 70 ° . ![Ocy](/content/j4743234w16557v8/xxlarge1054.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tscy](/content/j4743234w16557v8/xxlarge1094.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![yacy](/content/j4743234w16557v8/xxlarge1103.gif) ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) ![ucy](/content/j4743234w16557v8/xxlarge1091.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![chcy](/content/j4743234w16557v8/xxlarge1095.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![ucy](/content/j4743234w16557v8/xxlarge1091.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![softcy](/content/j4743234w16557v8/xxlarge1100.gif) ![shcy](/content/j4743234w16557v8/xxlarge1096.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![ucy](/content/j4743234w16557v8/xxlarge1091.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![bcy](/content/j4743234w16557v8/xxlarge1073.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![bcy](/content/j4743234w16557v8/xxlarge1073.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![bcy](/content/j4743234w16557v8/xxlarge1073.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tscy](/content/j4743234w16557v8/xxlarge1094.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) . ![Vcy](/content/j4743234w16557v8/xxlarge1042.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) , ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![khcy](/content/j4743234w16557v8/xxlarge1093.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) ![yacy](/content/j4743234w16557v8/xxlarge1103.gif) ![shchcy](/content/j4743234w16557v8/xxlarge1097.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![yacy](/content/j4743234w16557v8/xxlarge1103.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![ecy](/content/j4743234w16557v8/xxlarge1101.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![dcy](/content/j4743234w16557v8/xxlarge1076.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![tscy](/content/j4743234w16557v8/xxlarge1094.gif) , ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![chcy](/content/j4743234w16557v8/xxlarge1095.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) ![softcy](/content/j4743234w16557v8/xxlarge1100.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![zhcy](/content/j4743234w16557v8/xxlarge1078.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![ucy](/content/j4743234w16557v8/xxlarge1091.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![jcy](/content/j4743234w16557v8/xxlarge1081.gif) ![chcy](/content/j4743234w16557v8/xxlarge1095.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![vcy](/content/j4743234w16557v8/xxlarge1074.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![scy](/content/j4743234w16557v8/xxlarge1089.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![kcy](/content/j4743234w16557v8/xxlarge1082.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![pcy](/content/j4743234w16557v8/xxlarge1087.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![zcy](/content/j4743234w16557v8/xxlarge1079.gif) ![icy](/content/j4743234w16557v8/xxlarge1080.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![ncy](/content/j4743234w16557v8/xxlarge1085.gif) ![ocy](/content/j4743234w16557v8/xxlarge1086.gif) ![gcy](/content/j4743234w16557v8/xxlarge1075.gif) ![mcy](/content/j4743234w16557v8/xxlarge1084.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![tcy](/content/j4743234w16557v8/xxlarge1090.gif) ![iecy](/content/j4743234w16557v8/xxlarge1077.gif) ![rcy](/content/j4743234w16557v8/xxlarge1088.gif) ![acy](/content/j4743234w16557v8/xxlarge1072.gif) ![lcy](/content/j4743234w16557v8/xxlarge1083.gif) .
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