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https://hdl.handle.net/10119/3382
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| Title: | Impact of processing history on rheological properties for branched polypropylene |
| Authors: | Yamaguchi, M
Wagner, M.H |
| Keywords: | rheology
branch
polypropylene |
| 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: | https://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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