Effect of added copolymer on the critical properties of polymer mixtures

TitleEffect of added copolymer on the critical properties of polymer mixtures
Publication TypeJournal Article
Year of Publication1999
AuthorsDadmun, M. D., and Waldow Dean
JournalPhysical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume60
Issue4-B
Pagination4545-4550
Keywords36-6 (Physical Properties of Synthetic High Polymers), Monte Carlo simulation polymer blend property, physicochemical, Polymer blend compatibilizers, Polymer blends, PRP (Properties), RL: POF (Polymer in formulation), Simulation and Modeling, USES (Uses)
AbstractMonte Carlo simulation and finite-size anal. are used to det. the crit. properties of a binary homopolymer blend and of a polymer blend that is compatibilized with a random copolymer. Detn. of _, the crit. exponent for the correlation length, for the mixt. of two homopolymers shows that the binary blend exhibits properties that are consistent with Ising behavior (_ = 0.63). Similar results for the compatibilized blend show that the added copolymer acts very much like an impurity; lowering the mixing transition temp. and increasing the value of _ to a value that is in qual. agreement with Fisher renormalization (_ = 0.69). These results are important as copolymers are often added to polymer blends to act as compatibilizers. These results show that the anal. of the phase behavior of these mixts. must be done with the understanding that its crit. exponents differ from those of a binary polymer mixt.