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Effect of casting solvent on the heterogeneity of films of polymer blends
Author(s) -
Lu Shaoxiang,
Pearce Eli M.,
Kwei T. K.
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760351307
Subject(s) - miscibility , materials science , solvent , casting , polymer , methyl methacrylate , toluene , polymer chemistry , copolymer , chemical engineering , polymer blend , styrene , organic chemistry , composite material , chemistry , engineering
Abstract The miscibility window of the 50/50 w/w poly(styrene‐co‐4‐vinylphenyl)‐dimethylsilanol/poly(n‐butyl methacrylate) (ST‐VPDMS/PBMA) blends prepared from toluene was studied and determined to be in the VPDMS composition range of 4 to 18 mole% in the copolymers. The observed miscibility window was to be compared to the range of 9 to 34 mole% found for the blends prepared from methyl ethyl ketone which was capable of competing for hydrogen bonding. The fact that the observed miscibility windows are influenced by the choice of solvents illustrates that an equilibrium state of polymer mixing is not always attained in solvent casting films and that caution needs to be exercised in studying polymer miscibility when solvent cast films are used.