The 'nodular'alpha Form of Isotactic Polypropylene: Stiff and Strong Polypropylene with High Deformability
| Autor: | Finizia Auriemma, Claudio De Rosa, Giampiero Morini, Fabrizio Piemontesi, Oreste Tarallo, Simona Esposito, Rocco Di Girolamo, Dario Liguori, Anna Malafronte |
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| Přispěvatelé: | DE ROSA, Claudio, Auriemma, Finizia, Tarallo, Oreste, Malafronte, Anna, DI GIROLAMO, Rocco, Esposito, Simona, Piemontesi, Fabrizio, Liguori, Dario, Morini, Giampiero |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Nucleation 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry chemistry.chemical_compound law Tacticity Polymer chemistry Materials Chemistry Crystallization Ductility Polypropylene Materials Chemistry2506 Metals and Alloy Polymers and Plastic Organic Chemistry Mesophase 021001 nanoscience & nanotechnology 0104 chemical sciences Monomer Polymerization chemistry Chemical engineering 0210 nano-technology |
| Popis: | A study of the nucleating effects of isotactic poly(trimethylallylsilane) (iPTMAS) and poly(vinylcyclohexane) (iPVCH) for isotactic polypropylene (iPP) and their influence on the mechanical behavior of iPP is reported. The particles of catalyst are covered by poly(trimethylallylsilane) or poly(vinylcyclohexane) by polymerization of the corresponding monomers before polymerization of propylene. The method guarantees that the nucleating agents are perfectly dispersed into the iPP samples, with their consequent high efficiency. Isotactic poly(vinylcyclohexane) and poly(trimethylallylsilane) favor crystallization from the melt of α and β forms, respectively. Both nucleating agents affect the morphology greatly reducing the size of shperulites. This in turn affects the mechanical properties improving ductility and flexibility. All nucleated samples crystallize by rapid cooling from the melt in the α form and not in the mesophase, as occurs in the pure iPP. The resulting α form presents nodular crystals and behaves as a stiff material with high deformability. |
| Databáze: | OpenAIRE |
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