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Phase separation effects in processing of glass‐bead‐ and glass‐fiber‐filled thermoplastics by injection molding
Author(s) -
Hegler R. P.,
Mennig G.
Publication year - 1985
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.760250704
Subject(s) - materials science , bead , composite material , glass fiber , molding (decorative) , filler (materials) , mold , phase (matter) , fiber , organic chemistry , chemistry
Abstract Dumb‐bell specimens and rectangular boxes were used to study phase separation effects occurring in injection molding of glass‐bead and glass‐fiber‐filled thermoplastics. The separation effects were more pronounced with beads than with fibers and they increase with increasing bead diameter. The filler distribution is further influenced by mold geometry, filler concentration, matrix material, and processing conditions. If the use of fillers, which promote inhomogeneity, is unavoidable it is possible to improve the distribution of the rigid phase by a favorable choice of injection speed and melt temperature. With the theories available at present a qualitative interpretation of the origin of the observed separation phenomena is feasible.