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Dripping behavior of burning polymers under UL94 vertical test conditions
This article studied the dripping behavior of eight polymers under UL94 vertical test conditions. The results suggested two different dripping behaviors: Type I, dripping with uniform- and small-sized drops with the short first dripping time, and Type II, dripping with irregular- and large-sized drops with the long first dripping time. Polymers of Type I dripping had dominant decomposition mechanism of random-chain scission, low activation energy of viscous flow, and high ratio of effective heat of combustion to heat of gasification. Otherwise, Type II dripping dominates. The surface tension at ambient temperature and the melt flow index at processing temperatures were not as important to dripping as expected. It was found that talc could convert the dripping of low-density polyethylene from Type I to Type II at a critical talc loading level of 20 wt%, which was ascribed to the reduction in the burning rate and the formation of an integral residue. Finally, a generalized model was presented, and a derived correlation showed that the drop mass was a power law function of the dripping time.
Dripping behavior of burning polymers under UL94 vertical test conditions
This article studied the dripping behavior of eight polymers under UL94 vertical test conditions. The results suggested two different dripping behaviors: Type I, dripping with uniform- and small-sized drops with the short first dripping time, and Type II, dripping with irregular- and large-sized drops with the long first dripping time. Polymers of Type I dripping had dominant decomposition mechanism of random-chain scission, low activation energy of viscous flow, and high ratio of effective heat of combustion to heat of gasification. Otherwise, Type II dripping dominates. The surface tension at ambient temperature and the melt flow index at processing temperatures were not as important to dripping as expected. It was found that talc could convert the dripping of low-density polyethylene from Type I to Type II at a critical talc loading level of 20 wt%, which was ascribed to the reduction in the burning rate and the formation of an integral residue. Finally, a generalized model was presented, and a derived correlation showed that the drop mass was a power law function of the dripping time.
Dripping behavior of burning polymers under UL94 vertical test conditions
Wang, Yong (Autor:in) / Jow, Jinder (Autor:in) / Su, Kenny (Autor:in) / Zhang, Jun (Autor:in)
Journal of Fire Sciences ; 30 ; 477-501
01.11.2012
25 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
UL94 , dripping , vertical burning , talc , polyethylene
Dripping behavior of burning polymers under UL94 vertical test conditions
| Online Contents | 2012
Burning and dripping behaviors of polymers under the UL94 vertical burning test conditions
| British Library Online Contents | 2010
Burning and dripping behaviors of polymers under the UL94 vertical burning test conditions
| Online Contents | 2010
| British Library Online Contents | 2012