02175nas a2200193   4500008004100000245009800041210006900139260011800208300002700326490000900353520137500362100002701737700001801764700002201782700001801804700001801822700001701840856012401857       2015                        eng d00aInfluence of macromolecular architecture on necking in polymer extrusion film casting process0 aInfluence of macromolecular architecture on necking in polymer e  aCleveland, OHbAmerican Institute of Physics, 2 Huntington Quadrangle, STE 1No1, Melville, NY 11747-4501 USAcJUN  aArticle Number: 0800060 v16643 a<p>Extrusion film casting (EFC) is an important polymer processing technique that is used to produce several thousand tons of polymer films/coatings on an industrial scale. In this research, we are interested in understanding quantitatively how macromolecular chain architecture (for example long chain branching (LCB) or molecular weight distribution (MWD or PDI)) influences the necking and thickness distribution of extrusion cast films. We have used different polymer resins of linear and branched molecular architecture to produce extrusion cast films under controlled experimental conditions. The necking profiles of the films were imaged and the velocity profiles during EFC were monitored using particle tracking velocimetry (PTV) technique. Additionally, the temperature profiles were captured using an IR thermography and thickness profiles were calculated. The experimental results are compared with predictions of one-dimensional flow model of Silagy et al(1) wherein the polymer resin rheology is modeled using molecular constitutive equations such as the Rolie-Poly (RP) and extended Pom Pom (XPP). We demonstrate that the 1-D flow model containing the molecular constitutive equations provides new insights into the role of macromolecular chain architecture on film necking. D-1. Silagy, Y. Demay, and J-F. Agassant, Polym. Eng. Sci., 36, 2614 (1996).</p>1 aPol, Harshawardhan, V.1 aBanik, Sourya1 aAzad, Lal, Busher1 aThete, Sumeet1 aDoshi, Pankaj1 aLele, Ashish  uhttps://library.ncl.res.in/content/influence-macromolecular-architecture-necking-polymer-extrusion-film-casting-process