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Microhardness of extruded high density polyethylene fibers
Author(s) -
BaltáCalleja F. J.,
Mead William T.,
Porter Roger S.
Publication year - 1980
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.760200603
Subject(s) - materials science , indentation hardness , composite material , extrusion , ultimate tensile strength , high density polyethylene , rheometer , crystallization , polyethylene , shear modulus , modulus , microstructure , rheology , chemistry , organic chemistry
High‐density polyethylene of high tensile modulus has been produced by solid state extrusion using an Instron capillary rheometer. Microhardness measurements on these ultraoriented fibers have been made to assess their perfection from values of the tensile elastic modulus and shear strength. The microhardness tests were measured using a Vickers square diamond. The microhardness increased with the common temperature for crystallization and extrusion, likely due to improvement in the lateral packing of microfibrils. The variation of microhardness with draw ratio is also illustrated.