Premium
Influence of EP/PP viscosity ratio on the surface morphology and elasticity of injection moulded PP/EP
Author(s) -
Nysten Bernard,
Ghanem Antoine,
Costa JeanLouis,
Legras Roger
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199904)48:4<334::aid-pi168>3.0.co;2-p
Subject(s) - materials science , transmission electron microscopy , viscosity , polypropylene , composite material , morphology (biology) , natural rubber , homogeneous , elastic modulus , copolymer , polymer chemistry , polymer , nanotechnology , thermodynamics , genetics , physics , biology
The influence of the viscosity ratio between(ethylene–propylene) copolymer (EP) andpolypropylene (PP) on the EP surface distribution ininjection moulded disks of PP/EP resins has been investigated bytransmission electron microscopy (TEM) and by atomic forceand force modulation microscopies (AFM and FMM). TEM imagestaken on transverse sections parallel to the injection directionreveal that, for high EP/PP viscosity ratios, large (>1μm) undeformed EP nodules are observed up to the surface. TheAFM and FMM observations performed on the surface reveal soft regionsof the same size embedded in a more rigid matrix (undeformed EPnodules present at or just below the surface). For low viscosityratios, EP rubber nodules, strongly elongated parallel to thesurface, are observed by TEM. From FMM measurements, the elasticmodulus is found to be homogeneous across the surface and iscomparable to that measured above EP nodules on the high viscosityratio resin. © 1999 Society of Chemical Industry