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Papers by Fabrizio Piemontesi
L'invention concerne des (co)polymeres de butene-1 caracterises par les proprietes suivantes:... more L'invention concerne des (co)polymeres de butene-1 caracterises par les proprietes suivantes: le contenu d'unites butene-1 sous la forme de pentades isotactiques (mmmm) est compris entre 25 et 55 %; la viscosite intrinseque [?] mesuree dans la tetraline a 135 °C est comprise entre 1 et 3dL/g; le contenu de fraction insoluble dans le xylene a 0 °C est compris entre 3 et 60 %; et un rapport ES2/ES1=1, dans lequel ES1 represente la fraction soluble d'oxyde de diethyle en ebullition determinee sur le polymere en tant que tel et ES2 est la fraction soluble d'oxyde de diethyle en ebullition determinee apres broyage du polymere. Les (co)polymeres de butene-1 presentent un bon equilibre entre leur aptitude a la transformation et leur comportement elastomere.
THESIS APPROVAL This thesis, written under the supervision of the candidate's Advisory Committee,... more THESIS APPROVAL This thesis, written under the supervision of the candidate's Advisory Committee, and appmved by its members, has been presented to and accepted by the Graduate Board of the School of Fine and Applied At•ts of Boston University in partial fulfillment of the requirements for the degree of MASTER OF Musrc with
Un procedimiento para preparar un componente catalizador sobre MgCl2, y que comprende el uso de u... more Un procedimiento para preparar un componente catalizador sobre MgCl2, y que comprende el uso de un compuesto de Mg seleccionado de aducto de Lewis de formula MgX2 (R"OH)m en donde los grupos R"son grupos hidrocarburo C1-C 20, X es cloro ym es de 0,1 a 6, de un compuesto de Ti seleccionado entre tetrahaluros de titanio o compuesto TiXn(O1)4-n, en donde 0<=n<=3, X es halogeno y R1 es un grupo C1-C10 hidrocarbonado y un compuesto donador de electrones (ED) seleccionado de alcohol, esteres alquilicos de acidos carboxilicos alifaticos C1-C20, cetonas, aminas, amidas, nitrilos, alcoxisilanos y eteres alifaticos como compuestos esenciales, dicho procedimiento comprende dos o mas etapas de reaccion que implican el uso de al menos uno de dichos compuestos esenciales como reactivo fresco solo o en una mezcla en donde constituye el componente principal, y caracterizado por que el aducto de Lewis se hace reaccionar primero con el compuesto de titanio obteniendo de este modo un i...
HOMORES VERY HIGH AND NARROW MOLECULAR WEIGHT DISTRIBUTIONS obtained through PERFORMING THE POLYM... more HOMORES VERY HIGH AND NARROW MOLECULAR WEIGHT DISTRIBUTIONS obtained through PERFORMING THE POLYMERIZATION REACTION CATALYST PRESENCE BASED metallocene where the metallocene is stereorigid AND IS IN THEIR MESO isomeric form.
Macromolecules
The crystallization and thermal properties of copolymers of isotactic poly(1-butene) (iPB) with e... more The crystallization and thermal properties of copolymers of isotactic poly(1-butene) (iPB) with ethylene (iPBEt) synthesized with a Ziegler–Natta catalyst and ethylene (E) content between 7 and 45 ...
Macromolecules
A study of the nucleating effects of isotactic poly(trimethylallylsilane) (iPTMAS) and poly(vinyl... more 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 beh...
Phys. Chem. Chem. Phys.
Adducts of TiCl4 with Lewis bases used as internal or external donors in heterogeneous Ziegler-Na... more Adducts of TiCl4 with Lewis bases used as internal or external donors in heterogeneous Ziegler-Natta (ZN) catalysis represents a fundamental interaction contributing to the final composition of MgCl2 supported ZN-catalysts....
Polym. Chem., 2017
Nodular polypropylene from reactor granule technology for the production of a stiff and ductile m... more Nodular polypropylene from reactor granule technology for the production of a stiff and ductile material.
Journal of Thermal Analysis and Calorimetry, 2008
L'invention concerne des (co)polymeres de butene-1 caracterises par les proprietes suivantes:... more L'invention concerne des (co)polymeres de butene-1 caracterises par les proprietes suivantes: le contenu d'unites butene-1 sous la forme de pentades isotactiques (mmmm) est compris entre 25 et 55 %; la viscosite intrinseque [?] mesuree dans la tetraline a 135 °C est comprise entre 1 et 3dL/g; le contenu de fraction insoluble dans le xylene a 0 °C est compris entre 3 et 60 %; et un rapport ES2/ES1=1, dans lequel ES1 represente la fraction soluble d'oxyde de diethyle en ebullition determinee sur le polymere en tant que tel et ES2 est la fraction soluble d'oxyde de diethyle en ebullition determinee apres broyage du polymere. Les (co)polymeres de butene-1 presentent un bon equilibre entre leur aptitude a la transformation et leur comportement elastomere.
THESIS APPROVAL This thesis, written under the supervision of the candidate's Advisory Committee,... more THESIS APPROVAL This thesis, written under the supervision of the candidate's Advisory Committee, and appmved by its members, has been presented to and accepted by the Graduate Board of the School of Fine and Applied At•ts of Boston University in partial fulfillment of the requirements for the degree of MASTER OF Musrc with
Un procedimiento para preparar un componente catalizador sobre MgCl2, y que comprende el uso de u... more Un procedimiento para preparar un componente catalizador sobre MgCl2, y que comprende el uso de un compuesto de Mg seleccionado de aducto de Lewis de formula MgX2 (R"OH)m en donde los grupos R"son grupos hidrocarburo C1-C 20, X es cloro ym es de 0,1 a 6, de un compuesto de Ti seleccionado entre tetrahaluros de titanio o compuesto TiXn(O1)4-n, en donde 0<=n<=3, X es halogeno y R1 es un grupo C1-C10 hidrocarbonado y un compuesto donador de electrones (ED) seleccionado de alcohol, esteres alquilicos de acidos carboxilicos alifaticos C1-C20, cetonas, aminas, amidas, nitrilos, alcoxisilanos y eteres alifaticos como compuestos esenciales, dicho procedimiento comprende dos o mas etapas de reaccion que implican el uso de al menos uno de dichos compuestos esenciales como reactivo fresco solo o en una mezcla en donde constituye el componente principal, y caracterizado por que el aducto de Lewis se hace reaccionar primero con el compuesto de titanio obteniendo de este modo un i...
HOMORES VERY HIGH AND NARROW MOLECULAR WEIGHT DISTRIBUTIONS obtained through PERFORMING THE POLYM... more HOMORES VERY HIGH AND NARROW MOLECULAR WEIGHT DISTRIBUTIONS obtained through PERFORMING THE POLYMERIZATION REACTION CATALYST PRESENCE BASED metallocene where the metallocene is stereorigid AND IS IN THEIR MESO isomeric form.
Macromolecules
The crystallization and thermal properties of copolymers of isotactic poly(1-butene) (iPB) with e... more The crystallization and thermal properties of copolymers of isotactic poly(1-butene) (iPB) with ethylene (iPBEt) synthesized with a Ziegler–Natta catalyst and ethylene (E) content between 7 and 45 ...
Macromolecules
A study of the nucleating effects of isotactic poly(trimethylallylsilane) (iPTMAS) and poly(vinyl... more 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 beh...
Phys. Chem. Chem. Phys.
Adducts of TiCl4 with Lewis bases used as internal or external donors in heterogeneous Ziegler-Na... more Adducts of TiCl4 with Lewis bases used as internal or external donors in heterogeneous Ziegler-Natta (ZN) catalysis represents a fundamental interaction contributing to the final composition of MgCl2 supported ZN-catalysts....
Polym. Chem., 2017
Nodular polypropylene from reactor granule technology for the production of a stiff and ductile m... more Nodular polypropylene from reactor granule technology for the production of a stiff and ductile material.
Journal of Thermal Analysis and Calorimetry, 2008