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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/3382

Title: Impact of processing history on rheological properties for branched polypropylene
Authors: Yamaguchi, M
Wagner, M.H
Keywords: rheology
Issue Date: 2006-05
Publisher: Elsevier Science B.V., Amsterdam.
Magazine name: Polymer
Volume: 47
Number: 10
Start page: 3629
End page: 3635
DOI: 10.1016/j.polymer.2006.03.052
Abstract: The impact of applied processing history and the post-processing annealing procedure on the rheological properties of long-chain branched polypropylene (B-PP) have been studied intensively as compared with conventional linear polypropylene (L-PP) and low-density polyethylene (LDPE) produced by autoclave process. It was found that drawdown force, as a measure of melt elasticity for B-PP, is greatly depressed even by the short-time processing in an internal batch mixer, whereas the rheological properties of L-PP are unchanged by the processing history. Considering that the drawdown force is recovered to the original value during the post-processing annealing, the phenomenon is ascribed to the conformation change related to the branch structure, i.e., the alignment of long branches to a backbone chain, which is known as “shear modification”. Further, it is demonstrated that the depression of the drawdown force for B-PP is more significant than that for LDPE. Moreover, it is also clarified that B-PP needs a longer post-processing annealing time to recover the drawdown force than LDPE. The difference in the recovery curves during the annealing suggests that B-PP has less relatively “short” long branches.
Rights: Elsevier Ltd., Masayuki Yamaguchi and Manfred H. Wagner, Polymer, 47(10), 2006, 3629-3635. http://www.sciencedirect.com/science/journal/00323861
URI: http://hdl.handle.net/10119/3382
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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