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.

The "nodular"alpha Form of Isotactic Polypropylene: Stiff and Strong Polypropylene with High Deformability / DE ROSA, Claudio; Auriemma, Finizia; Tarallo, Oreste; Malafronte, Anna; DI GIROLAMO, Rocco; Esposito, Simona; Piemontesi, Fabrizio; Liguori, Dario; Morini, Giampiero. - In: MACROMOLECULES. - ISSN 0024-9297. - 50:14(2017), pp. 5434-5446. [10.1021/acs.macromol.7b00787]

The "nodular"alpha Form of Isotactic Polypropylene: Stiff and Strong Polypropylene with High Deformability

DE ROSA, CLAUDIO;AURIEMMA, FINIZIA;TARALLO, ORESTE;MALAFRONTE, ANNA;DI GIROLAMO, ROCCO;
2017

Abstract

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.
2017
The "nodular"alpha Form of Isotactic Polypropylene: Stiff and Strong Polypropylene with High Deformability / DE ROSA, Claudio; Auriemma, Finizia; Tarallo, Oreste; Malafronte, Anna; DI GIROLAMO, Rocco; Esposito, Simona; Piemontesi, Fabrizio; Liguori, Dario; Morini, Giampiero. - In: MACROMOLECULES. - ISSN 0024-9297. - 50:14(2017), pp. 5434-5446. [10.1021/acs.macromol.7b00787]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/688110
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