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A method to control the dispersion of carbon black in an immiscible polymer blend
Author(s) -
Feng Jiyun,
Chan Chiming,
Li Jianxiong
Publication year - 2003
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.10089
Subject(s) - materials science , carbon black , polypropylene , methyl methacrylate , dispersion (optics) , viscosity , polymer , phase (matter) , polymer blend , poly(methyl methacrylate) , composite material , polymer chemistry , copolymer , organic chemistry , natural rubber , chemistry , physics , optics
The dispersion of carbon black ( CB ) in an immiscible polymer blend of poly‐(methyl methacrylate) (PMMA) and polypropylene (PP) was studied as the viscosity of PMMA increased. It was found that the dispersion of carbon black was strongly influenced by the viscosity of PMMA. The CB was dispersed in the PMMA phase when the viscosities of PMMA and PP are comparable, as predicted by Sumita's model. As the viscosity of PMMA increases, the CB was found to be located at the interface between the PMMA and PP phases. On further increase in the viscosity of PMMA, the CB was found to be dispersed in the PP phase. In addition, the CB dispersion in the PP/PMMA blends can significantly influence the positive temperature coefficient (PTC) intensity of the blends.