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Extrusion film casting of long chain branched polypropylene

DSpace at IIT Bombay

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Title Extrusion film casting of long chain branched polypropylene
 
Creator CHIKHALIKAR, K
BANIK, S
AZAD, LB
JADHAV, K
MAHAJAN, S
AHMAD, Z
KULKARNI, S
GUPTA, S
DOSHI, P
POL, H
LELE, A
 
Subject REACTIVE EXTRUSION
RHEOLOGICAL PROPERTIES
POLYMER MELTS
CONSTITUTIVE-EQUATIONS
RHEOTENS-MASTERCURVES
MOLECULAR-STRUCTURE
FLOW
STRENGTH
BEHAVIOR
MODEL
 
Description Extrusion film casting (EFC) is an important melt processing operation which is extensively used to make polypropylene (PP) films. Linear PP shows significant amount of necking and draw resonance during EFC. One of the ways to reduce necking is to introduce long chain branches (LCB) on the polymer backbone. The long branches impart extensional strain hardening behavior thereby stabilizing the melt flow. In this work, we investigate the influence of long chain branching in polypropylene on the extent of necking in the EFC process. Laboratory scale EFC experiments were performed on homopolymer PP of linear and long chain branched architectures. Simulations of the EFC process were carried out using the one-dimensional flow model of Silagy et al., Polym. Eng. Sci.,36, 2614 (1996) into which we incorporate two different multi-mode molecular constitutive equations namely, the eXtended Pom-Pom' equation (XPP, for long chain branched PP) and the Rolie-Poly' equation (RP-S, for linear PP). Our experimental data confirm that presence of long chain branching in PP reduces the extent of necking and our numerical predictions show qualitative agreement with experimental data, thereby elucidating the role of chain architecture on the extent of necking. POLYM. ENG. SCI., 55:1977-1987, 2015. (c) 2014 Society of Plastics Engineers
 
Publisher WILEY-BLACKWELL
 
Date 2016-01-14T10:46:14Z
2016-01-14T10:46:14Z
2015
 
Type Article
 
Identifier POLYMER ENGINEERING AND SCIENCE, 55(9)1977-1987
0032-3888
1548-2634
http://dx.doi.org/10.1002/pen.24039
http://dspace.library.iitb.ac.in/jspui/handle/100/17394
 
Language en