2013
DOI: 10.1515/epoly-2013-0120
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Rheological measurement of molecular weight distribution of polymers

Abstract: This paper has described a method to obtain the molecular weight distribution (MWD) of polymeric materials from their rheological data. The method has been developed for linear polymers with log normal molecular weight distribution. The rheological data required to obtain the molecular weight distribution are the shear storage modulus,G' (ω) , and shear loss modulus,G" (ω) , extending from the terminal zone to the plateau region. For determining the molecular weight average, the method uses the relationship be… Show more

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“…In addition, lower Mw of the recycled polymer affects the mechan performance of the material, which is characterized below. The changes in the average molecular weight (M w ) and polydispersity index (PDI) with an increasing number of recycling steps for PP without and with additive (Figure 8AB) were obtained from the rheological measurements of frequency sweep analysis [34], which has been reported in the literature to be in good agreement with the results of gel permeation chromatography (GPC), the most commonly used technique to determine M w [35]. It has been observed that the peak of M w shifts to lower values with increasing recycling steps, which can be attributed to degradation and chain scission [36].…”
Section: Rheological Propertiesmentioning
confidence: 99%
“…In addition, lower Mw of the recycled polymer affects the mechan performance of the material, which is characterized below. The changes in the average molecular weight (M w ) and polydispersity index (PDI) with an increasing number of recycling steps for PP without and with additive (Figure 8AB) were obtained from the rheological measurements of frequency sweep analysis [34], which has been reported in the literature to be in good agreement with the results of gel permeation chromatography (GPC), the most commonly used technique to determine M w [35]. It has been observed that the peak of M w shifts to lower values with increasing recycling steps, which can be attributed to degradation and chain scission [36].…”
Section: Rheological Propertiesmentioning
confidence: 99%
“…The available knowledge about the rheometric technique is derived from the pioneering works of Wu [22] and Tuminello [23,24]. All of the equations proposed for the calculation of Mw distribution from simple melt rheology tests have been validated by multiple authors on different materials [25,26]. Software has been developed to automatically translate all rheological information into Mw information for a variety of synthetic polymers [27,28].…”
Section: Introductionmentioning
confidence: 99%