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The effect of addition of high‐density polyethylene on the crystallization and mechanical properties of polypropylene and glass‐fiber‐reinforced polypropylene
Author(s) -
Gupta A. K.,
Gupta V. B.,
Peters R. H.,
Harland W. G.,
Berry J. P.
Publication year - 1982
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.1982.070271214
Subject(s) - polypropylene , materials science , composite material , differential scanning calorimetry , polyethylene , ultimate tensile strength , glass transition , composite number , crystallization , scanning electron microscope , glass fiber , fiber , toughness , young's modulus , polymer , chemical engineering , physics , engineering , thermodynamics
High‐density polyethylene up to about 30% by weight was melt‐mixed with polypropylene and short‐glass‐fiber‐reinforced polypropylene. The presence of high‐density polyethylene and glass fibers in the polypropylene matrix affects its crystallization characteristics, which were studied with the help of differential scanning calorimetry. The blend and composite samples have a large number of polypropylene domains apparently due to an abundance of surface nuclei; as a result, the tensile strength, tensile modulus, and toughness are enhanced. The temperature dependence of shear modulus and logarithmic decrement indicate that high‐density polyethylene can have plasticizing effect below the glass transition temperature of polypropylene. The scanning electron micrographs of fractured ends show the presence of dispersed domains in the composite samples.