About: Effect of skin-core morphology on mechanical properties in injection-molded parts

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The presented study deals with an effect of different processing parameters during injection molding on morphological stucture and on mechanical properties. In this work tensile bars of an isotactic polypropylene were injected under different conditions as flow rate, melt temperature and mold temperature. The morphological stucture was investigated by polarized light microscopy on a thin section cut perpendicular to the flow direction. Fountain flow in the mold cavity influenced the crystalization kinetics and the presence of three distinct crystalline zones was observed; namely, a highly oriented non-spherulitic skin, a shear-nucleated spherulitic intermediate layer, and an inner core composed of spherulites with a low orientation. The results showed that flow rate will have the greatest influence on the thickness of the oriented skin layer. Mechanical properties of the tensile samples demonstrated, that the larger thickness of two outer skins will provide higher tensile strenght. The same effect was confirmed also by the microharness test, where the skin layer was harder than inner spherulitic core. The presented study deals with an effect of different processing parameters during injection molding on morphological stucture and on mechanical properties. In this work tensile bars of an isotactic polypropylene were injected under different conditions as flow rate, melt temperature and mold temperature. The morphological stucture was investigated by polarized light microscopy on a thin section cut perpendicular to the flow direction. Fountain flow in the mold cavity influenced the crystalization kinetics and the presence of three distinct crystalline zones was observed; namely, a highly oriented non-spherulitic skin, a shear-nucleated spherulitic intermediate layer, and an inner core composed of spherulites with a low orientation. The results showed that flow rate will have the greatest influence on the thickness of the oriented skin layer. Mechanical properties of the tensile samples demonstrated, that the larger thickness of two outer skins will provide higher tensile strenght. The same effect was confirmed also by the microharness test, where the skin layer was harder than inner spherulitic core. (en)
Title	Effect of skin-core morphology on mechanical properties in injection-molded parts Effect of skin-core morphology on mechanical properties in injection-molded parts (en)
skos:prefLabel	Effect of skin-core morphology on mechanical properties in injection-molded parts Effect of skin-core morphology on mechanical properties in injection-molded parts (en)
skos:notation	RIV/70883521:28610/14:43871969!RIV15-MSM-28610___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(ED2.1.00/03.0111)
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Dvořák, Zdeněk Hnátková, Eva
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Tomáše Bati ve Zlíně / Univerzitní institut
http://linked.open...dnocenehoVysledku	13497
http://linked.open...ai/riv/idVysledku	RIV/70883521:28610/14:43871969
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	skin-core, polypropylene, morphology, tensile strength, microhardness (en)
http://linked.open.../riv/klicoveSlovo	skin-core microhardness morphology polypropylene tensile strength
http://linked.open...ontrolniKodProRIV	[FDF7CEC27981]
http://linked.open...in/vavai/riv/obor	JJ
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Centre of Polymer Systems
http://linked.open...UplatneniVysledku	2014
http://linked.open...iv/tvurceVysledku	Dvořák, Zdeněk Hnátková, Eva Pavelová, Petra
http://localhost/t...ganizacniJednotka	28610

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