ISSN:
0730-6679
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The polydispersity index (PI) of polypropylene (PP) obtained from plotting the crossover point of shear storage modulus (G′) and loss modulus (G″) was comparable to that using gel permeation chromatography (GPC). The precise PI determination was dependent upon the material properties of PP and rheological measurement technique. The effect of testing percent strain on PI was determined over a wide range of melt flow rate (MFR). The employed percent strain could affect PI of this percent strain was not independent of the frequency at the crossover frequency of the resin. To measure PI precisely, a 5% strain was recommended for MFR ≥ 30, while a 15% strain was suitable for MFR 〈 30. © 1993 by John Wiley & Sons, Inc.
Additional Material:
17 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/adv.1993.060120406
