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  • The morphology of isotactic polypropylene is investigated using scanning electron microscopy. The structure is modified by the addition of specific nucleating agent, special processing conditions or blending with polyethylene. The addition of β-nucleating agent into polypropylene induces the crystallization into fine β-spherulitic structure on the contrary to relatively large α-spherulites observed in neat polypropylene. Extrusion of polypropylene with special extrusion line equipped by semi-hyperbolic extrusion die causes the formation of fibrillar structure. Such a self-reinforced material possesses significantly improved strength and modulus. The extrusion of polypropylene/polyethylene blend using the same extrusion line leads to the creation of microfibrillar-reinforced material where the polypropylene serves as a stiffening rod and polyethylene as a matrix.
  • The morphology of isotactic polypropylene is investigated using scanning electron microscopy. The structure is modified by the addition of specific nucleating agent, special processing conditions or blending with polyethylene. The addition of β-nucleating agent into polypropylene induces the crystallization into fine β-spherulitic structure on the contrary to relatively large α-spherulites observed in neat polypropylene. Extrusion of polypropylene with special extrusion line equipped by semi-hyperbolic extrusion die causes the formation of fibrillar structure. Such a self-reinforced material possesses significantly improved strength and modulus. The extrusion of polypropylene/polyethylene blend using the same extrusion line leads to the creation of microfibrillar-reinforced material where the polypropylene serves as a stiffening rod and polyethylene as a matrix. (en)
  • Morfologie izotaktického polypropylenu je studována pomocí skenovacího elektronového mikroskopu. Struktura je modifikována přídavkem specifického nukleačního činidla, procesními podmínkami nebo mísením s polyetylenem. Přídavek β-nukleačního činidla do polypropylenu způsobuje krystalizaci do jemné β-sférolitické struktury. Naopak čistý polypropylen vykazuje relativně velké α-sférolity. Vytlačování polypropylenu na speciální vytlačovací lince vybavené semi-hyperbolickou vytlačovací hlavou vede k vytvoření fibrilární struktury. Takový samo-vyztužený materiál vykazuje výrazně zvýšené mezní napětí a modul pružnosti. Vytlačování směsi polypropylenu s polyetylenem použitím stejné vytlačovací linky vede k formaci mikrofibrilárního vyztuženého materiálu, kde polypropylen slouží jako vyztužující komponenta a polyetylen jako matrice. (cs)
Title
  • Morphology Variations of Polypropylene.
  • Morfologické variace polypropylenu (cs)
  • Morphology Variations of Polypropylene. (en)
skos:prefLabel
  • Morphology Variations of Polypropylene.
  • Morfologické variace polypropylenu (cs)
  • Morphology Variations of Polypropylene. (en)
skos:notation
  • RIV/70883521:28110/07:63505289!RIV08-MSM-28110___
http://linked.open.../vavai/riv/strany
  • 704-712
http://linked.open...avai/riv/aktivita
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  • P(GP106/07/P262), Z(MSM7088352101)
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  • 435129
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  • RIV/70883521:28110/07:63505289
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  • scanning electron microscopy; polymorphism; structure; self-reinforcement; blends (en)
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http://linked.open...ontrolniKodProRIV
  • [1A2D98AA7576]
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  • Badajoz
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  • Modern Research and Educational Topics
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  • Čermák, Roman
  • Obadal, Martin
  • Výchopňová, Jana
http://linked.open...n/vavai/riv/zamer
number of pages
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  • Formatex Research Center
https://schema.org/isbn
  • 978-84-611-9420-9
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  • 28110
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