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Binary interactions in dimethyl terephthalate/bis(2‐ethylhexyl)adipate/poly(vinyl chloride) blends studied by melting point depression method
Author(s) -
Gan L. H.,
Chee K. K.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960411)60:2<271::aid-app15>3.0.co;2-8
Subject(s) - adipate , melting point depression , vinyl chloride , materials science , polyvinyl chloride , melting point , polymer chemistry , composite material , copolymer , polymer
A novel approach is developed to estimate the interaction energy density, B , of polymer solutions by the melting point depression method using a crystallizable molecule as the probe. It rests on the classical Flory–Huggins lattice model of polymer solutions, and considers the polymer–solvent interaction parameter to be concentration dependent. The ternary system dimethyl terephthalate (DMT)/bis(2‐ethylhexyl)adipate (DOA)/poly(vinyl chloride) (PVC) is chosen for the present study. The data of B for the three possible binary interactions are reported as the functions of composition at elevated temperatures. For a plasticized PVC resin containing 20 vol % DOA, the B is estimated to be 6 MJ m −3 , which is approximately 2 MJ m −3 higher than the B value cited in the literature for the PVC mixed with almost 100% DOA. The thermodynamic stability of the ternary, system is discussed. © 1996 John Wiley & Sons, Inc.