Journal
POLYMER
Volume 51, Issue 2, Pages 500-506Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.11.066
Keywords
Dynamic rheological behavior; Degradation; Crosslinking
Categories
Funding
- National Nature Science Foundation of China [50603023]
- National Basic Research Program of China [2005CB623800]
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The structural stability of impact polypropylene copolymer (IPC) melt under high temperatures was explored by dynamic rheological measurement. The structure changes including degradation and crosslinking of IPC were discussed through examining the influence of temperature and additive antioxidant on dynamic rheological functions. A plateau of dynamic storage modulus (G') appeared in low frequency region at high temperatures under air atmosphere. Furthermore, when IPC sample was annealed at 230 degrees C, its viscoelasticity presented a dramatic change. The time dependences of G' for pure IPC at different temperatures were investigated. At 190 degrees C, a slight drop and a succedent rise of G' for IPC0 appeared. The decrease period of G' generally shorted and the increase of G' became more remarkable with the increase of temperature. The decrease of G' was ascribed to the degradation in IPC and the G' increase was due to the crosslink reaction. Through incorporation of antioxidant into IPC, the crosslinking in IPC could be effectively inhibited, and the degradation and crosslinking in IPC were believed to result from PP component. (C) 2009 Elsevier Ltd. All rights reserved.
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