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Carbon black filled PET/PMMA blends: Electrical and morphological studies
Author(s) -
Mallette J. G.,
Márquez A.,
Manero O.,
CastroRodríguez R.
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11359
Subject(s) - materials science , carbon black , electrical resistivity and conductivity , composite material , phase (matter) , polymer , dispersion (optics) , electrical conductor , methyl methacrylate , viscosity , surface tension , polymer blend , poly ethylene , morphology (biology) , ethylene , copolymer , natural rubber , biochemistry , chemistry , physics , catalysis , organic chemistry , optics , quantum mechanics , biology , electrical engineering , genetics , engineering
In this work, the electrical and morphological properties of blends of poly(ethylene terephthalate) (PET), poly(methyl methacrylate) (PMMA), and carbon black (CB) were analyzed. Resistivity decreases similarly in both PET and PMMA with CB concentration. Similarly in the PET/PMMA blend, extensive modification to this behavior occurs, since resistivity becomes a function of morphology and specific location of CB in the polymers. A minimum in the resistivity of the blend with 5% CB (PET basis) is observed at 100% PET, whereas with an increase in the CB content to 20%, the minimum in the resistivity shifts to 60% PET. High conductivity is observed when PET is the continuous phase (having the larger viscosity). Large stresses lead to a large dispersion of CB and a high deformation and rupture of the dispersed PMMA phase. This situation itself promotes an increase of surface area of droplets and high CB concentrations at the interface. Consideration is given to models that predict a selective location of conductive particles in the PET matrix based on its lower interfacial tension with CB.