Journal ArticleDOI
Rheology of poly(vinyl chloride) formulations from melt flow index measurements
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TLDR
In this paper, a method has been proposed to estimate the rheograms of a PVC formulation at temperatures relevant to its processing conditions with the use of a master curve, knowing the melt flow index and glass-transition temperature of the formulation.Abstract:
A knowledge of the complete flow curve, or rheogram, of a PVC formulation depicting the variation of the melt viscosity over industrially relevant ranges of shear rate and temperature is essential in the design of polyer-processing equipment, process optimization, and troubleshooting. These data are generated on sophisticated rheometers that are beyond the financial and technical means of most PVC processors. The only flow parameter that can be readily measured on an inexpensive apparatus is the melt flow index of the resin-mix. In the present work, a method has been proposed to estimate the rheograms of a PVC formulation at temperatures relevant to its processing conditions with the use of a master curve, knowing the melt flow index and glass-transition temperature of the formulation. A master curve that coalesces rheograms of different PVC formulations at various temperatures has been generated and proposed as a tool for estimating the flow curve.read more
Citations
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Journal ArticleDOI
Triacetin as a Secondary PVC Plasticizer
TL;DR: The use of biobased plasticizers with low toxicity and good compatibility with polyvinyl chloride (PVC) has become more attractive in the recent years in contrast with phthalate derivatives.
Journal ArticleDOI
Methyl Acetyl Ricinoleate as Polyvinyl Chloride Plasticizer
TL;DR: The use of alternative plasticizers with low toxicity and good compatibility with polyvinyl chloride (PVC) has become more attractive in the recent years in contrast with the phthalate derivatives as mentioned in this paper.
Journal ArticleDOI
Rheological models for unified curves for simplified design calculations in polymer processing
Aroon Shenoy,D. R. Saini +1 more
TL;DR: In this paper, a modified generalized Newtonian model has been fitted to a number of polymers covering one or more from each group of olefinics, styrenics, cellulosics, vinyls and engineering thermoplastics.
Journal ArticleDOI
Melt rheology of some specialty polymers
D. R. Saini,Aroon Shenoy +1 more
TL;DR: In this paper, a method was proposed to estimate the complete flow curves for some of the important speciality poly mers such as polyphenylene oxide, poly phenylene sulfide, polyether sulfide and polyaryl sulfone through the use of the developed grade and temperature independent unified curves along with the appropriate melt flow index value.
Book ChapterDOI
Steady shear viscous properties
TL;DR: In this paper, a review of the literature on the rheology of highly filled polymer melt systems is presented, where the filler loading range between 40 to about 60% by volume is referred to as the high filler loading ranges.
References
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Journal ArticleDOI
Polyvinylchloride melt rheology II—the influence of molecular weight on flow activation energy†
E. A. Collins,A. P. Metzger +1 more
TL;DR: In this paper, the authors examined the flow behaviors of a series of polyvinylchloride (PVC) resins covering a broad range of molecular weight and showed that the influence of temperature on viscosity depends on the temperature range and that the activation energy is not constant but can be approximated by two values, one applicable to low temperatures, the other to high temperatures.
Journal ArticleDOI
Rheological properties of polymer melts
G. V. Vinogradov,A. Ya. Malkin +1 more
TL;DR: In this paper, the dependence of the apparent viscosity on the molecular weight, temperature and shear stress can be represented as the product of three independent functions, each of them having a single argument.
Journal ArticleDOI
Relationship between rheological properties and structure of poly(vinyl chloride)
TL;DR: In this article, the viscosity and extrudate swell as functions of shear rate and temperature as well as flow profiles and complex shear modulus were measured on the melt of three suspension poly(vinyl chlorides) of different molecular weights.
Journal ArticleDOI
Rheograms for engineering thermoplastics from melt flow index
TL;DR: In this paper, the effects of chain branching and chain rigidity on the master curve of a resin type have been elucidated with reference to polyacetal and polysulfone, respectively.