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Phase Diagram for Liquid Crystalline Polymer/ Polycarbonate Blends
Author(s) -
Huang G,
Chan P. K.,
Kamal M. R.
Publication year - 2003
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450810209
Subject(s) - spinodal decomposition , phase diagram , materials science , differential scanning calorimetry , miscibility , upper critical solution temperature , polymer blend , spinodal , polycarbonate , polymer , phase (matter) , thermodynamics , scanning electron microscope , polymer chemistry , lower critical solution temperature , composite material , copolymer , chemistry , organic chemistry , physics
A novel mechanism to form binary polymer blends is through phase separation by spinodal decomposition in the unstable region of the phase diagram. The present work investigates the effects of thermally‐induced phase separation by spinodal decomposition on the morphology development of liquid crystalline polymer/polycarbonate blends. Moreover, a thermodynamic binary phase diagram is obtained using a twin‐screw extruder at various processing melt temperatures. Differential scanning calorimetry and scanning electron microscopy were used to study the miscibility of the blends and the resulting morphology. A thermodynamic binary phase diagram exhibiting a lower critical solution temperature was obtained. The droplet size distribution of the blend was also obtained and discussed in light of the Cahn‐Hilliard theory.