Metallocene copolymers of propene and 1‐hexene: The influence of the comonomer content and thermal history on the structure and mechanical properties

López-Majada, Juan M.; Palza, Humberto; Guevara, Juan Luis; Quijada, Raúl; Martínez, M.C.; Benavente, Rosario; Pereña, José M.; Pérez, Ernesto; Cerrada, María L.

doi:10.1002/polb.20781

Cited by 67 publications

(78 citation statements)

References 47 publications

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“…The corresponding values obtained at room temperature are listed in Table 1. The degree of crystallinity is within the range of that found in analogous quenched metallocenic iPP specimens [26][27][28][29][30]. Under the quenching conditions imposed during film preparation, crystallization takes place at conditions far from equilibrium and the fast cooling applied limits even more the development of crystallites and their perfection.…”

Section: Resultssupporting

confidence: 54%

Rheological and structural details of biocidal iPP-TiO2 nanocomposites

Serrano

Cerrada

Ressia

et al. 2012

European Polymer Journal

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Nanocomposites obtained from incorporation of TiO 2 nanoparticles in different amounts, ranging from 0.5 to 5 wt.%, into an isotactic polypropylene (iPP) matrix are achieved via a straightforward and cost-effective melting process. These materials exhibit a powerful germicide capability over a wide variety of regular bacteria and other microorganisms widely present in the environment that cause infections and serious illness.The iPP-TiO 2 nanocomposites show similar or improved structural characteristics than those of the pure iPP matrix and aspects as important as processability and final mechanical performance seem to be not affected because of the incorporation of these TiO 2 nanoparticles.Validation of time-temperature superposition of the molten polymers is observed within the temperature range analyzed. On the other hand, the α polymorph is the one primarily attained for these specimens. Crystallinity and most probable crystallite size are slightly dependent on TiO 2 content, both increasing as oxide composition is enlarged.

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Section: Resultssupporting

confidence: 54%

Rheological and structural details of biocidal iPP-TiO2 nanocomposites

Serrano

Cerrada

Ressia

et al. 2012

European Polymer Journal

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“…This figure shows a similar dependence of this mechanical parameter on comonomer content than that found for E, s Y values and for the crystallinity. This similar variation with comonomer content leads to a linear dependence in the double log-log scale between the elastic modulus and MH, proposed [25] and fulfilled by many systems [25,[39][40][41][42][43][44] in a very broad range of MH and E values: from thermoplastic elastomers…”

Section: Mechanical Responsementioning

confidence: 89%

Metallocenic Isotactic Poly(propylene) and its Copolymers with 1‐Hexene and Ethylene

Arranz-Andrés

Suárez

Peña

et al. 2007

Macro Chemistry & Physics

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A comprehensive study of the structure and properties has been performed for copolymers of propylene‐1‐hexene, CiPH, and propylene‐ethylene, CiPE, synthesized by an isotactic metallocene catalyst system. The comonomer content constitutes the most important factor affecting the structure and properties of these CiPH and CiPE copolymers, although the length of the comonomer is also very important. Thus, a considerable decrease in crystallinity is observed in the two kinds of copolymers as the comonomer content increases. The structure in the CiPH copolymers evolves, however, from the typical, monoclinic crystal lattice to mesomorphic‐like, ordered entities for the highest 1‐hexene molar fraction, whereas in the CiPE copolymers the structural evolution with molar fraction goes from a monoclinic lattice to an almost amorphous material. All of these variations in crystal structure significantly influence the viscoelastic and mechanical behavior of these CiPH and CiPE copolymers. Consequently, the location and intensity of the different relaxation mechanisms, as well as the rigidity parameters (storage and Young's moduli and microhardness) and deformation mechanism are strongly dependent upon composition.magnified image

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“…The influence of crystallinity in hardness values has been also found in other olefinic based polymers [47][48][49][50]. Effect of other morphological features, as particle agglomeration and dispersion heterogeneity among others, does not show straightforward trends on mechanical response and the obtained information may be sometimes contradictory.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 93%

Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: Catalytic aspects of in situ polymerization, crystalline features and mechanical properties

Cerrada

Bento

Pérez

et al. 2016

Microporous and Mesoporous Materials

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Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: Catalytic aspects of in situ polymerization, crystalline features and mechanical properties, Microporous and Mesoporous Materials (2016), doi: 10.1016/j.micromeso.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Mechanical response is observed to be dependent on the content in mesoporous MCM-41 and on the crystalline features of polyethylene. Accordingly, stiffness increases and deformability decreases in the nanocomposites as much as MCM-41 content is enlarged and polyethylene amount within channels is raised. Ultimate mechanical performance improves with MCM-41 incorporation without varying the final processing temperature.

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Metallocene copolymers of propene and 1‐hexene: The influence of the comonomer content and thermal history on the structure and mechanical properties

Cited by 67 publications

References 47 publications

Rheological and structural details of biocidal iPP-TiO2 nanocomposites

Rheological and structural details of biocidal iPP-TiO2 nanocomposites

Metallocenic Isotactic Poly(propylene) and its Copolymers with 1‐Hexene and Ethylene

Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: Catalytic aspects of in situ polymerization, crystalline features and mechanical properties

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