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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14739

Title: Effect of thermal modification on rheological properties of polyethylene blends
Authors: Monchai Siriprumpoonthum
Nobukawa, Shogo
Satoh, Yasuo
Yamaguchi, Masayuki
Keywords: Thermal Modification
Rheological Properties
Polyethylene Blends
Issue Date: 2014-02-26
Publisher: American Institute of Physics
Magazine name: Journal of Rheology
Volume: 58
Number: 2
Start page: 449
End page: 465
DOI: 10.1122/1.4866345
Abstract: We examined the effects of thermal modification under flow field on the rheological properties of linear low-density polyethylene (LLDPE) with high molecular weight, low-density polyethylene (LDPE), and their blends, without thermal stabilizer. Although structural changes during processing are not detected by size extrusion chromatography or nuclear magnetic resonance spectroscopy (NMR), linear viscoelastic properties changed greatly, especially for the LLDPE. A cross-linking reaction took place, leading to, presumably, star-shaped long-chain branches. Consequently, the modified LLDPE, having high zero-shear viscosity, became a thermo-rheologically complex melt. Moreover, it should be noted that the drawdown force, defined as the uniaxial elongational force at a constant draw ratio, was significantly enhanced for the blends. Enhancement of elongational viscosity was also detected. The drawdown force and elongational viscosity are marked for the thermally-modified blend as compared with those for the blend of thermally-modified pure components. Intermolecular cross-linking reactions between LDPE and LLDPE, yielding polymers with more than two branch points per chain, result in marked strain-hardening in the elongational viscosity behavior even at small strain. The recovery curve of the oscillatory modulus after the shear modification is further evidence of a branched structure.
Rights: Copyright 2014 The Society of Rheology. This is the author's version of the work and posted here with permission of the Society of Rheology. Monchai Siriprumpoonthum, Shogo Nobukawa, Yasuo Satoh, Hiroko Sasaki and Masayuki Yamaguchi, Journal of Rheology, 58(2), 449-465 (2014). http://dx.doi.org/10.1122/1.4866345
URI: http://hdl.handle.net/10119/14739
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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