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Extensional Rheology in Polymer Processing

For more informative webinars, visit http://www.tainstruments.com/webinars Extensional flows dominate many polymer processes, including blow molding, film blowing, fiber spinning, thermo-forming and many others. The rheology of polymeric materials under extensional flows can differ significantly from shear flows and it is important to understand this in order to optimize both materials and processes. Presented by Prof. Joao Maia of Case Western University, Department of Macro-molecular Science and Engineering. Contact Us: https://www.tainstruments.com/contact/ Contact a Sales Rep: https://www.tainstruments.com/sales-c... Connect: FACEBOOK   / tainstruments   LINKEDIN   / ta-instruments   TWITTER   / tainstruments   INSTAGRAM   / tainstruments   CHAPTERS 0:00 Intro 2:20 Motivation - Extensional Flow 11:39 Extensional Flows 24:36 Extensional Rheometry 26:45 Extensional Flows 29:42 Extensional Rheometry 30:51 Flow Kinematics 32:06 Varying Sample Length 34:34 Constant Sample Length 38:22 Flow Kinematics 39:22 Experimental Sources of Error 48:35 Case Study - Thermoforming 50:38 Objectives 51:18 Materials 51:38 Oscillatory Shear 53:13 Shear Viscosity 53:38 Extensional Viscosity 55:02 Rupture Behavior 58:42 Constitutive Modelling 1:01:22 Thermoforming - The Problem 1:02:35 Evolution of Inflated Volume 1:05:53 Thickness Distribution Profile 1:08:29 Conclusions