ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Polymer crystalline regions can be characterized by wide-angle X-ray scattering (WAXS)and small-angle X-ray scattering (SAXS). The in-situ study of isotactic polypropylene withmeasurement of wide angle and small angle X-ray scattering (WAXS and SAXS), at varyingdistances from the exit of the extruder have been successfully completed using an X-ray systemwith a standard X-ray source. The processing conditions, used were: 50, 100, 200 and 400m.min-1for the take up speed, 0.3, 0.6, and 1.2 cm3min-1hole-1 for the melt flow rates, and a spinningtemperature of 220°C. These experimental conditions produced draw down ratios ranging from 33up to 1058. The X-ray characterization was carried in-situ at 15, 30, 45 and 60 cm from the exit ofthe spinneret and also ex-situ. The results obtained show the crystallinity index and the crystallineorientation to increase for the higher draw down rates, as expected under draw inducedcrystallization conditions, and a logarithmic relationship was observed within the experimentalconditions used in this work. This communication reports the relationship between the crystallinity,crystalline orientation and lamellar long period and draw down ratio along the spin line
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.572.pdf
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