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Microstructure of long‐ and short‐fiber reinforced injection molded polyamide
Author(s) -
Toll S.,
Andersson P.O.
Publication year - 1993
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.750140205
Subject(s) - materials science , composite material , fiber , microstructure , polyamide , core (optical fiber) , volume fraction , polishing
The variation of fiber orientation and content within injection molded rectangular plates is investigated. Fiber orientation and volume fraction are measured using metallographic polishing and a newly developed image‐analysis system; fiber weight‐fractions are measured using an ashing method. Three different moldings are studied; two of the long‐fiber compound Verton, Molded at different injection speeds, and one of the short‐fiber compound Maranyl. Microstructural regions are identified and characterized, and the flow mechanisms by which they are formed are discussed. The results show that the long fibers segregate extensively, whereas the short ones do not. The major differences between the two compounds are found in the core: the core of the long‐fiber compound has a higher content and orientation of fibers than that of the short‐fiber compound.