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Effective interaction between monolayers of block copolymer compatiblizer in a polymer blend

Thompson, R. B. and Matsen, M. W. (2000) Effective interaction between monolayers of block copolymer compatiblizer in a polymer blend. The Journal of Chemical Physics, 112 (15). 6863. ISSN 0021-9606

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To link to this item DOI: 10.1063/1.481262

Abstract/Summary

The stability of ternary blends of two immiscible homopolymers and a block copolymer compatiblizer depends crucially on the effective interaction between the copolymermonolayers that form between the unlike homopolymer domains. Here, the interaction is calculated for blends involving A and B homopolymers of equal size with ABABdiblock copolymers of symmetric composition using both self-consistent field theory (SCFT) and strong-segregation theory (SST). If the homopolymers are larger than the copolymer molecules, an attractive interaction is predicted which would destroy the blend. This conclusion coupled with considerations regarding the elastic properties of the monolayer suggests that the optimum size of the homopolymer molecules is about 80% that of the copolymer molecule. A detailed examination of the theory demonstrates that the attraction results from the configurational entropy loss of the homopolymer molecules trapped between the copolymermonolayers. We conclude by suggesting how the monolayers can be altered in order to suppress this attraction and thus improve compatiblization.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences
ID Code:63617
Publisher:American Institute of Physics

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