Author
Rosario Benavente
Other affiliations: University of Concepción
Bio: Rosario Benavente is an academic researcher from Spanish National Research Council. The author has contributed to research in topics: Comonomer & Crystallinity. The author has an hindex of 31, co-authored 175 publications receiving 3316 citations. Previous affiliations of Rosario Benavente include University of Concepción.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a broad range of degrees of crosslinking, from 1.7 up to 74% of reacted hydroxyl groups, was achieved, and the variation of the thermal and mechanical properties of PVA with the crosslink density show an initial decrease due to the diminution of the crystallinity of the system, caused by the cross-linking.
480 citations
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TL;DR: In this article, the competition between α, β, and γ polymorphs was studied in a β-nucleated metallocenic isotactic polypropylene, iPP, as a function of the cooling rate and of the isothermal crystallization temperature, by performing X-ray diffraction and DSC experiments.
Abstract: The competition between α, β, and γ polymorphs has been studied in a β-nucleated metallocenic isotactic polypropylene, iPP, as a function of the cooling rate and of the isothermal crystallization temperature, by performing X-ray diffraction and DSC experiments. It was found that the addition of a 1% by weight of a typical β-nucleating agent is not enough to develop any appreciable amount of β modification, at least under the crystallization conditions used, which cover a wide range of cooling rates. In comparison, the same amount of nucleating agent added to a Ziegler−Natta iPP leads to almost 100% of β form at low cooling rates. It seems that such amount of β nucleating agent is not enough to counterbalance the well-known γ nucleation ability of the relatively high content of defects (stereo- and regioerrors) which are present in the studied metallocenic iPP, and only different proportions of γ and α modifications are obtained in this sample, the relative amount of them depending on the cooling rate. On ...
160 citations
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TL;DR: In this paper, the authors investigated the relationship between the composition of ethylene/norbornene copolymers and their thermal properties and showed that there is no linear correlation between the amount of norbornene incorporated in copolymer and thermal behavior.
Abstract: This study involves research on possible relationships between the composition of ethylene/norbornene copolymers and their thermal properties. The copolymers were fully characterised by differential scanning calorimetry (DSC), 13 C NMR spectroscopy, Fourier transformation infra-red (FTIR) and Raman spectroscopy. The results of this study show that there is no linear correlation between the amount of norbornene incorporated in copolymers and thermal behaviour when copolymers containing high norbornene content and different microstructures are considered. The latter of which was found to be extremely sensitive to the catalyst used in its preparation.
89 citations
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TL;DR: In this paper, the influence of the composition and thermal history on the type of lattice developed has been studied by wide-angle X-ray diffraction measurements in three vinyl alcohol−ethylene, VAE, copolymers with different compositions, which were crystallized from the melt at various cooling rates.
Abstract: The influence of the composition and thermal history on the type of lattice developed has been studied by wide-angle X-ray diffraction measurements in three vinyl alcohol−ethylene, VAE, copolymers with different compositions, which were crystallized from the melt at various cooling rates. The results are compared with those of the corresponding homopolymers, poly(vinyl alcohol) and low-density polyethylene. Both the composition and the cooling rate have been found to determine the crystalline structure of these VAE copolymers. Thus, for the samples slowly crystallized from the melt, a monoclinic lattice is obtained for copolymers VAE71 and VAE68 (with compositions of 71 and 68 mol % VA, respectively) while an orthorhombic lattice has been found for copolymer VAE56 (56 mol % VA). The effect of the cooling rate is very important, since copolymers VAE71 and VAE68 lead to the orthorhombic form when the samples are quenched from the melt. Copolymer VAE56 has been found to crystallize in an orthorhombic lattice...
81 citations
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TL;DR: Results show that the shape of the Mg reinforcing particles plays a crucial role in the degradation rate of PLA/Mg composites, with spherical particles promoting a lower degradation rate than irregular particles, which helps to customize bioabsorbable materials in order to meet the requirements for a specific application and patient.
73 citations
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TL;DR: A comprehensive review of literature on bio-fiber reinforced composites is presented in this paper, where the overall characteristics of reinforcing fibers used in biocomposites, including source, type, structure, composition, as well as mechanical properties, are reviewed.
3,074 citations
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TL;DR: A comprehensive overview on the development of polymeric membranes having advanced or novel functions in the various membrane sepn processes for liq. and gaseous mixts can be found in this paper.
1,841 citations
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TL;DR: In this article, the authors present an overview of the key requirements for the proton exchange membranes (PEM) used in fuel cell applications, along with a description of the membrane materials currently being used and their ability to meet these requirements.
1,715 citations
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TL;DR: In this article, the effects of polymer weight average molecular weight (MW) on the fiber structure of electrospun polyvinyl alcohol (PVA) have been studied and the average fiber diameter was between 250 nm and 2 μm.
762 citations
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TL;DR: Variable neighbourhood search (VNS) is a metaheuristic, or a framework for building heuristics, based upon systematic changes of neighbourhoods both in descent phase, to find a local minimum, and in perturbation phase to emerge from the corresponding valley as mentioned in this paper.
Abstract: Variable neighbourhood search (VNS) is a metaheuristic, or a framework for building heuristics, based upon systematic changes of neighbourhoods both in descent phase, to find a local minimum, and in perturbation phase to emerge from the corresponding valley It was first proposed in 1997 and has since then rapidly developed both in its methods and its applications In the present paper, these two aspects are thoroughly reviewed and an extensive bibliography is provided Moreover, one section is devoted to newcomers It consists of steps for developing a heuristic for any particular problem Those steps are common to the implementation of other metaheuristics
718 citations