Frequency and temperature dependence of molecular and micromechanical transitions in PPO/PMMA/P(S-g-EO) blends

✍ Scribed by H. Eklind; F. H. J. Maurer

• Book ID: 102658549
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 968 KB
• Volume: 34
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19960715)34:9<1569::aid-polb5>3.0.co;2-g

✦ Synopsis

The frequency and temperature dependence of molecular and micromechanical transitions were studied in polymer blends with an interphase. The viscoelastic properties of poly(2,6dimethyl-p-phenylene oxide) (PPO) and poly(methy1 methacrylate) (PMMA) blends that were compatibilized by a poly(styrene-graft-ethylene oxide) (P(S-g-EO)) copolymer were studied by dynamic mechanical spectroscopy (DMS) and the experimental data were compared with an interlayer model. The addition of the copolymer resulted in a micromechanical transition, and the relation between the volume fraction of interphase, the activation energy of the micromechanical transition, and the micromechanical transition temperature was studied. A qualitative agreement between experiments and theory was achieved. The quantitative difference was explained by partial mixing of PPO and/or PMMA with the copolymer in the interphase. 0