Extensional Rheology in Polymer Processing

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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.

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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