Premium
Property modification of bulk molding compounds for use in injection molding
Author(s) -
Pritchard M.,
Gibson A. G.
Publication year - 1988
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750090206
Subject(s) - materials science , composite material , izod impact strength test , flexural strength , molding (decorative) , glass fiber , filler (materials) , volume fraction , polyester , limiting , ultimate tensile strength , mechanical engineering , engineering
Although impact and flexural strength of injectionmolded bulk molding compounds increase initially with glass fiber content, these properties level out at a glass volume fraction between 0.1 and 0.2, limiting the achievable properties. Use of “special purpose” polyester resins gives no significant improvement in impact. The impact strength limitation is not worsened, however, by using the maximum processable level of filler, this being true for all fillers commonly used in polyester compounds. Replacement of a fraction of the glass by poly(ethylene terephthalate) fibers results in a substantial improvement in impact strength.