Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22917
Title: Melt extrudate swell behavior of graphene nano-platelets filled-polypropylene composites
Authors: Liang, JZ
Du, Q
Wei, LY
Tsui, CP 
Tang, CY 
Law, WC 
Zhang, SD
Keywords: Die-swell
Extrusion
Graphene nano-platelets
Melt
Polymer-matrix composites
Polypropylene
Issue Date: 2015
Publisher: Elsevier Ltd
Source: Polymer testing, 2015, v. 45, 4453, p. 179-184 How to cite?
Journal: Polymer Testing 
Abstract: Abstract The extrudate swell ratios of polypropylene (PP) composite melts filled with graphene nano-platelets (GNPs) were measured using a capillary rheometer within a temperature range of 180-230°C and apparent shear rate varying from 100 to 4000 s-1 in order to identify the effects of the filler content and test conditions on the melt die-swell behavior. It was found that the values of the extrudate swell ratio of the composites increased with increasing apparent shear rate, with the correlation between them obeying a power law relationship, while the values of the extrudate swell ratio decreased almost linearly with rise in temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, and decreased roughly linearly with an increase of the GNP weight fraction. In addition, the extrudate swell mechanisms are discussed from the observation of the fracture surface of the extrudate using scanning electronic microscopy. This study provides a basis for further development of graphene reinforced polymer composites with desirable mechanical performance and good damage resistance.
URI: http://hdl.handle.net/10397/22917
ISSN: 0142-9418
DOI: 10.1016/j.polymertesting.2015.06.007
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