Phase Structure in Blends of Poly(ethylene glycol) and Poly(styrene-co-methacrylic acid)

Phase structures in blends of poly(ethylene glycol) (PEG) and poly(styrene-co-methacrylic acid) (P(S-co-MAA)) with several contents of methacrylic acid units are investigated by using both optical microscopy and field emission type scanning electron microscopy (FE-SEM). It is found that phase-separa...

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Bibliographic Details
Published in:Macromolecules 1999-02, Vol.32 (4), p.1175-1179
Main Authors: Akiba, Isamu, Ohba, Yasushi, Akiyama, Saburo
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:Phase structures in blends of poly(ethylene glycol) (PEG) and poly(styrene-co-methacrylic acid) (P(S-co-MAA)) with several contents of methacrylic acid units are investigated by using both optical microscopy and field emission type scanning electron microscopy (FE-SEM). It is found that phase-separated domains are diminished with increasing MAA content in PEG/P(S-co-MAA) blends. Further, in the blends in which the ratio of MAA/−CH2CH2O− is larger than 0.2 (mol/mol), macroscopic phase structures disappeared despite the presence of two T g's meaning separation into two phases in differential scanning calorimetry (DSC) measurements. In PEG/P(S-co-MAA) blends in which MAA/−CH2CH2OEnDash− > 0.2 (mol/mol), phase-separated structures like interpenetrating networks are found by FE-SEM observations.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma980981o