Effect of the network structure on the flammability ofcis-1,4-polyisoprene vulcanizates |
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Authors: | G Janowska L ?lusarski |
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Institution: | (1) Institute of Polymers, Technical University of ód , 90-924 ód , Poland |
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Abstract: | The combustibilities ofcis-1,4-polyisoprene and its peroxide and sulphur vulcanizates have been investigated by means of the oxygen index method. The temperature distribution in the sample and the molecular weight of the liquid products formed as a result of elastomer destruction in the combustion zone have been measured. It has been found that the combustibility ofcis- 1,4-polyisoprene diminishes as its cross-link density increases. This effect is much stronger for sulphur than for peroxide vulcanizates. The investigations lead to the conclusion that a mechanism of network degradation and volatile sulphur compounds penetrating to the flame are responsible for this difference.
Zusammenfassung Die Brennbarkeit des unvernetztencis-1,4-Polyisoprens und seiner Peroxid- und Schwefelvulkanisate wurde mit der Sauerstoffindexmethode untersucht. Messungen der Temperaturverteilung im Prüfling wurden ebenfalls ausgeführt und das Molekulargewicht der infolge der Zersetzung der Elastomere in der Verbrennungszone entstehenden flüssigen Produkte mit der Methode der dynamischen Osmometrie bestimmt. Es wurde festgestellt, daß die Brennbarkeit des cis-1,4-Polyisoprens mit zunehmender Vernetzungsdichte abnimmt, und zwar viel ausgeprägter im Falle der Schwefel- als im Falle der Peroxidvulkanisate. Es wurde gefolgert, daß flüchtige, in die Flamme gelangende Schwefelverbindungen als Verbrennungsinhibitoren wirken.
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![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![rcy](/content/x618ru078h5122q1/xxlarge1088.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![ycy](/content/x618ru078h5122q1/xxlarge1099.gif) ![scy](/content/x618ru078h5122q1/xxlarge1089.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![yacy](/content/x618ru078h5122q1/xxlarge1103.gif) ![zcy](/content/x618ru078h5122q1/xxlarge1079.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![rcy](/content/x618ru078h5122q1/xxlarge1088.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![kcy](/content/x618ru078h5122q1/xxlarge1082.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![tcy](/content/x618ru078h5122q1/xxlarge1090.gif) ![ucy](/content/x618ru078h5122q1/xxlarge1091.gif) ![chcy](/content/x618ru078h5122q1/xxlarge1095.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![scy](/content/x618ru078h5122q1/xxlarge1089.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![rcy](/content/x618ru078h5122q1/xxlarge1088.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![ycy](/content/x618ru078h5122q1/xxlarge1099.gif) ![scy](/content/x618ru078h5122q1/xxlarge1089.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![dcy](/content/x618ru078h5122q1/xxlarge1076.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![mcy](/content/x618ru078h5122q1/xxlarge1084.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) ![bcy](/content/x618ru078h5122q1/xxlarge1073.gif) ![ucy](/content/x618ru078h5122q1/xxlarge1091.gif) ![scy](/content/x618ru078h5122q1/xxlarge1089.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![rcy](/content/x618ru078h5122q1/xxlarge1088.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![zcy](/content/x618ru078h5122q1/xxlarge1079.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![chcy](/content/x618ru078h5122q1/xxlarge1095.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![mcy](/content/x618ru078h5122q1/xxlarge1084.gif) ![iecy](/content/x618ru078h5122q1/xxlarge1077.gif) ![zhcy](/content/x618ru078h5122q1/xxlarge1078.gif) ![dcy](/content/x618ru078h5122q1/xxlarge1076.gif) ![dcy](/content/x618ru078h5122q1/xxlarge1076.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![ucy](/content/x618ru078h5122q1/xxlarge1091.gif) ![mcy](/content/x618ru078h5122q1/xxlarge1084.gif) ![tcy](/content/x618ru078h5122q1/xxlarge1090.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![pcy](/content/x618ru078h5122q1/xxlarge1087.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![vcy](/content/x618ru078h5122q1/xxlarge1074.gif) ![ucy](/content/x618ru078h5122q1/xxlarge1091.gif) ![lcy](/content/x618ru078h5122q1/xxlarge1083.gif) ![kcy](/content/x618ru078h5122q1/xxlarge1082.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![ncy](/content/x618ru078h5122q1/xxlarge1085.gif) ![icy](/content/x618ru078h5122q1/xxlarge1080.gif) ![zcy](/content/x618ru078h5122q1/xxlarge1079.gif) ![acy](/content/x618ru078h5122q1/xxlarge1072.gif) ![tcy](/content/x618ru078h5122q1/xxlarge1090.gif) ![ocy](/content/x618ru078h5122q1/xxlarge1086.gif) .
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