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Phase behavior of ternary blends containing dimethylpolycarbonate, tetramethylpolycarbonate and poly[styrene‐ co ‐(methyl methacrylate)] copolymers (or polystyrene)
Author(s) -
Kim JW,
Yoo JE,
Kim CK
Publication year - 2005
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1656
Subject(s) - miscibility , ternary operation , polystyrene , materials science , methyl methacrylate , polymer blend , copolymer , styrene , polymer chemistry , gibbs free energy , flory–huggins solution theory , thermodynamics , ternary numeral system , chemical engineering , polymer , composite material , physics , computer science , engineering , programming language
The miscibility and phase behavior of ternary blends containing dimethylpolycarbonate (DMPC), tetramethylpolycarbonate (TMPC) and poly[styrene‐ co ‐(methyl methacrylate)] copolymer (SMMA) have been explored. Ternary blends containing polystyrene (PS) instead of SMMA were also examined. Blends of DMPC with SMMA copolymers (or PS) did not form miscible blends regardless of methyl methacrylate (MMA) content in copolymers. However, DMPC blends with SMMA (or PS) blends become miscible by adding TMPC. The miscible region of ternary blends is compared with the previously determined miscibility region of binary blends having the same chemical components and compositions. The region where the ternary blends are miscible is much narrower than that of binary blends. Based on lattice fluid theory, the observed phase behavior of ternary blends was analyzed. Even though the term representing the Gibbs free energy change of mixing for certain ternary blends had a negative value, blends were immiscible. It was revealed that a negative value of the Gibbs free energy change of mixing was not a sufficient condition for miscible ternary blends because of the asymmetry in the binary interactions involved in ternary blends. Copyright © 2004 Society of Chemical Industry