An in-process ultrasonic approach to investigating the relaxation of orientation and disorientation of polymer melts

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DOIResolve DOI: http://doi.org/10.1002/pen.21023
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TypeArticle
Journal titlePolymer Engineering and Science
Volume48
Issue5
Pages987994; # of pages: 8
AbstractThe orientation and relaxation behaviors of a low-density polyethylene melt and polypropylene melts with different melt indices undergoing a shear flow in a restricted channel were investigated by using ultrasound. A capillary rheometer was used to force the polymer melt through a slit die equipped with pressure, temperature, and ultrasound sensors, and the variation of ultrasound velocity traversing the melt was measured. Experimental results revealed that due to different mechanisms involved, the relaxations of orientation and disorientation processes show different dependences of ultrasound velocity on shear rate, temperature, and melt index.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number49383
NPARC number15804300
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Record identifierb2bc6dd4-ef13-416c-9d6e-e57d4d30e84f
Record created2010-07-09
Record modified2016-05-09
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