Monte Carlo Simulation of Phase Separation Dynamics of a Polymer Blend in the Presence of Block Copolymer. 2. Effect of Block Copolymer Composition

1996 ◽  
Vol 29 (21) ◽  
pp. 6933-6940 ◽  
Author(s):  
Seung Hyun Kim ◽  
Won Ho Jo ◽  
Jinhwan Kim
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Phase Separation ◽  
Block Copolymer ◽  
Polymer Blend ◽  
Copolymer Composition

Monte Carlo Simulation of the Peroxide Curing of Ethylene Elastomers

2003 ◽  
Vol 76 (1) ◽  
pp. 174-201 ◽  
Author(s):  
Robert T. Johnston
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Sol Gel ◽  
Relaxation Modulus ◽  
Weight Fraction ◽  
Copolymer Composition ◽  
Polymer Backbone ◽  
Plateau Modulus ◽  
Melt Index ◽  
Peroxide Initiation

Abstract Four ethylene octene copolymers covering a range of 0.87–0.91 g/cc density and 0.5–30 melt index were crosslinked using 0.25–8.0 phr dicumyl peroxide and characterized by sol-gel analysis and dynamic viscometry in an RPA 2000 rheometer. Using Monte Carlo simulation, the peroxide initiation efficiency (45–57%) and scission/crosslinking ratio (0.10–0.26) were determined. After using these sol-gel results to calibrate the simulation, the simulation was used to predict and analyze the crosslinked network structure as a function of extent of peroxide reaction. From the simulation output, the RPA 2000 dynamic storage modulus was successfully modeled using a three component model comprised of: (a) an affine modulus contribution related to the number of elastically active chains; (b) a Pearson-Graessley trapped entanglement contribution related to the weight fraction of elastically active network chains and the plateau modulus (which was in turn related to copolymer composition through a polymer backbone weight fraction model); and (c) a relaxation modulus component related empirically to network defects. These results show how misleading curemeter (ODR, MDR, RPA) data can be without application of an appropriate analytical or simulation model for their interpretation, but also how useful, when appropriately analyzed, these data can be for developing a fundamental understanding of polymer structure-network-property relationships.

Phase Separation Kinetics of a Polymer Blend Modified by Random and Block Copolymer Additives

2001 ◽  
Vol 34 (3) ◽  
pp. 514-521 ◽  
Author(s):  
Bethany Barham ◽  
Kari Fosser ◽  
Gretchen Voge ◽  
Dean Waldow ◽  
Adel Halasa
Keyword(s):  
Phase Separation ◽  
Block Copolymer ◽  
Polymer Blend ◽  
Phase Separation Kinetics ◽  
Kinetics Of ◽  
Separation Kinetics
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