The Sharkskin Onset and Stability Diagram
作者:
P. WONGSOMNUK,
J. BANYAM,
A. SIRIVAT,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 2000)
卷期:
Volume 39,
issue 5-6
页码: 723-730
ISSN:0022-2348
年代: 2000
DOI:10.1081/MB-100102483
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The onset of sharkskin extrudate was investigated in terms of molecular structure, molecular weight, temperature, and die geometry. The recoverable shearSRor the ratio of wall shear stress over the storage modulus was determined and found to be independent of molecular weight, temperature, and die geometry for linear low-density polyethylenes (LLDPEs), but it depended critically on these factors and the molecular weight distribution for high-density polyethylenes (HDPEs). The plot ofSRversus λs/ϵs, or the sharkskin wavelength roughness amplitude ratio, constituted a sharkskin marginal stability curve common for all molecular weights, temperatures, and die geometry investigated; it is unique for each polymer type or molecular structure. Sharkskin instability occurred without hysteresis effect.
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