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Fibrillar morphology of elastomer‐modified polypropylene: Effect of interface adhesion and processing conditions
Author(s) -
Zhang Ling,
Huang Rui,
Wang Gang,
Li Liangbin,
Ni Haiying,
Zhang Xinyuan
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11163
Subject(s) - elastomer , materials science , polypropylene , composite material , izod impact strength test , viscosity , extrusion , dispersion (optics) , molding (decorative) , morphology (biology) , adhesion , shear rate , ultimate tensile strength , physics , genetics , biology , optics
The effect of interface interaction and processing conditions combined with the viscosity ratio of elastomer domains to the polypropylene (PP) matrix (η d /η m , subscript d and m designate the dispersed phase and the matrix, respectively) on fibril formation was investigated. A close to unity viscosity ratio, high interface interaction between the two phases, and a high shear rate in molding were found to result in fibril dispersion. A low‐viscosity elastomer tended to form fibrils also. A high extrusion shear rate seems to have no effect on fibrillar formation, but the dispersion size (D n ) decreased from 0.25 to 0.19 μm with an increasing screw speed from 120 to 160 rpm. The Izod impact strength of blends appears to be optimum when a fine and uniform and nonfibril morphology of the elastomer in PP is formed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2085–2092, 2002