A Dielectric Investigation of Miscibility and Morphology in Engineering Thermoplastics

✍ Scribed by Pratt, Graeme J.; Smith, Michael J. A.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 297 KB
• Volume: 43
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199706)43:2<137::aid-pi716>3.0.co;2-o

✦ Synopsis

Measurements of complex relative permittivity over extended ranges of frequency and temperature have been obtained for a number of commercially important engineering thermoplastics. The study provides evidence for partial miscibility of the component polymers of impact-modiÐed polycarbonate/ polybutylene terephthalate and polycarbonate/polyethylene terephthalate blends and for a two-phase blend morphology with a polyester-rich dispersed phase in a continuous matrix rich in polycarbonate. A second representative conclusion concerns poly(acrylonitrileÈbutadieneÈstyrene) where dielectric spectroscopy yields separate absorptions which can be related to the miscibility and morphology of the individual phases. In this case two low-temperature absorptions are attributed respectively to rubber-rich and styreneÈacrylonitrile-rich regions in the core and shell of the latex particles which constitute the dispersed phase.