Journal
POLYMER
Volume 51, Issue 10, Pages 2221-2228Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.03.014
Keywords
Slip velocity; Melt-fracture; Polystyrene
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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We investigated slip and unstable flow phenomena of polystyrene melts in capillaries from the view of the effects of temperature and molecular weight by using three polystyrene samples with different molecular weights (M-w = 192,000, M-w = 258,000, and M-w = 321,000). The slip velocities are estimated by the Mooney method and the modified Mooney method. We found that the slip velocity increases and the critical slip stress sigma((s))(c) above which a slip starts to occur decreases with the temperature. We also observed the melt-fracture at above a critical melt-fracture stress sigma((m))(c) higher than sigma((s))(c). We found that the onset of melt fracture is affected by the extensional stress near the entry region to the capillary in the barrel and the melt-fracture tends to easily occur with increase of the molecular weight, but is not sensitive to the temperature. (C) 2010 Elsevier Ltd. All rights reserved.
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