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Phase equilibrium in blends of crystalline poly(ethylene oxide) – amorphous poly(methyl acrylate) or poly(methyl methacrylate)
Author(s) -
Suvorova Anna I,
Hassanova Albina H,
Tujkova Irina S
Publication year - 2000
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 - 10.1002/1097-0126(200009)49:9<1014::aid-pi520>3.0.co;2-j
Subject(s) - materials science , poly(methyl methacrylate) , ethylene oxide , methyl methacrylate , amorphous solid , glass transition , polymer , polymer chemistry , polymer blend , methyl acrylate , chemical engineering , melting point , ethyl acrylate , oxide , composite material , copolymer , organic chemistry , chemistry , metallurgy , engineering
Phase separation in blends of crystalline poly(ethylene oxide) (PEO) and amorphous poly(methyl methacrylate) (PMMA) or poly(methyl acrylate) (PMA) has been examined using DTA, small‐angle light scattering, and polarized microscopy. The structure of the polymer blends was analysed by the wide‐angle X‐ray diffraction technique. It is found that phase separation takes place in both systems above the melting point ( T m ) of the crystalline component. PEO/PMMA blends have an upper critical solution temperature above the glass transition temperature and T m of the system. Components of PEO/PMMA blends are compatible in two regions: when the PMA concentration is 0.0–0.5 weight fraction or exceeds 0.8 weight fraction. PEO and PMA are immiscible in the melt at intermediate concentrations. It is shown that compatibility of components in the melt of crystalline and amorphous polymers is not a universal property of polymer blends. © 2000 Society of Chemical Industry