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Effects of the blending sequence in polyolefin ternary blends
Author(s) -
Ha M. H.,
Kim M. S.,
Kim B. K.,
Kim W.,
Lee M. C.,
Kim H. D.
Publication year - 2004
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.13687
Subject(s) - high density polyethylene , materials science , polyolefin , ternary operation , mixing (physics) , polypropylene , composite material , viscosity , polymer blend , polyethylene , tacticity , plastics extrusion , copolymer , melt flow index , polymer chemistry , polymer , polymerization , physics , layer (electronics) , quantum mechanics , computer science , programming language
Ternary blends of isotactic polypropylene (PP), ethylene–octene copolymer (mPE), and high‐density polyethylene (HDPE) were prepared by melt mixing in a twin‐screw extruder with two different sequences of mixing: the simultaneous mixing of the three components (method I) and the premixing of mPE and HDPE followed by mixing with PP (method II). Regardless of the mixing sequence, mPE encapsulated HDPE in the PP matrix, although better mechanical properties were generally obtained with method II. The domain size was mainly determined by the viscosity ratio of mPE to PP in method I and by the viscosity ratio of the binary blend (mPE/HDPE) to PP in method II. Specimens prepared by injection molding gave much finer dispersions than compression‐molded specimens. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 804–811, 2004