1,721,021 research outputs found
Effect of processing condition on properties of polylactic acid parts obtained by foam injection molding
No full textFoam injection molding of poly(lactic) acid: Effect of back pressure on morphology and mechanical properties
No full textCrystallization of Poly(lactic acid) under continuous shear conditions: On-line x-ray analysis in isothermal conditions
No full textIn this work, the effect of shear rate on the isothermal crystallization of a poly(lactic acid), PLA, was analyzed. The crystallinity evolution of PLA during continuous shear was assessed by collecting X-ray diffraction data at short time intervals by adopting a synchrotron source. Shear rates in the range from 0.1 s(-1) to 1.5 s(-1) were analyzed. It was found that increasing the shear rate induced a dramatic decrease of the half crystallization times, more than one order of magnitude in the analyzed range of shear rates. A model for the description of crystallinity evolution was applied to describe the experimental results. It was found that the nucleation rate needed to describe the data are much larger than what measured in a previous work in the same range of shear rates but adopting a short step shear protocol
Le droit à une vie familiale « gay » en Europe. Le rôle de la CEDH et des cours nationales dans la reconnaissance des unions de même sexe
No full textThe chapter offers a comparative assessment of the role of European courts - both domestic and supranational - in the recognition of "same-sex" family life
Effect of back pressure on morphology and mechanical properties of poly(lactic) acid parts obtained by foam injection molding
No full textFoam injection molding of poly(lactic acid) with environmentally friendly physical blowing agents
No full textBiodegradable polymers present a very narrow processing window, with the suitable processing temperatures close to the degradation conditions. The aim of this work was to analyze the foamability of a biodegradable polymer, namely the poly(lactic acid), PLA. Foam injection molding was conducted by using a blowing agent under high pressure and temperature to produce parts having a cellular core and a compact solid skin (the so-called "structural foam"). The effect of a physical blowing agent (PBA) on density and morphology of foamed parts was characterized. A masterbatch of PLA and talc was prepared and adopted to obtain a compound containing 3% of talc. On adding this percentage of talc to PLA it was possible to obtain foamed parts with a much better morphology. © 2014 Elsevier B.V. All rights reserved
Remedies Against Immunity? Reconciling International and Domestic Law after the Italian Constitutional Court’s Sentenza 238/2014
No full textAn Emerging Right to a “Gay” Family Life? The Case Oliari v. Italy in a Comparative Perspective
No full textThis Article analyses, through the lens of comparative law, the Oliari and others v. Italy judgment, which was issued by the European Court of Human Rights (ECtHR) in July 2015. The Oliari case is important for being the first judgment in which the ECtHR established the granting of legal “recognition and protection” to same-sex couples as a positive obligation for the Member States of the Council of Europe on the basis of Article 8 of the European Convention on Human Rights. In order to understand the role of judicial bodies in the progressive protection of homosexual rights, this Article combines an analysis of European case law with the national perspective. As it concerns the supranational facet, the authors illustrate Oliari’s reasoning and situate the case in the jurisprudence of the ECtHR. Elements of both continuity and innovation emerge from the analysis, as well as a relevant dimension of judicial dialogue supporting the incremental recognition of gay rights in Europe. As it concerns the national facet, this specific case was initially dealt with at the domestic level and was the object of judgment 138/2010 by the Italian Constitutional Court. The judgment is critically put into perspective through the examination of the jurisprudence of other European Constitutional Courts (France, Portugal and Spain) that were called on to decide similar cases in the same period. Therefore, the Article offers a comparative analysis of the Oliari judgment clarifying its relevance and speculating on the potential value of this case for the future recognition of the right to a “gay” family life in Europe
Determination of the effect of pressure on viscosity at high shear rates by using an injection molding machine
No full textThe effect of pressure on rheological behavior of polymer melts is surely a significant phenomenon for polymer processing, and its determination has been the object of several studies which highlighted the difficulties in performing accurate measurements. Even more important is the determination of this effect at very high shear rates, which cannot easily be obtained by conventional rheometers. In this work, a slit rheometer was located at the nozzle of the injection molding machine to obtain rheological measurements by means of two pressure transducers. Pressure values were analyzed by an original method to evaluate the pressure coefficient and the viscosity at zero pressure. The zero pressure viscosity aligned with independent rheological measurements obtained in previous works. The effect of pressure on viscosity was described by means of a parameter whose values resulted to be in line with those obtained in previous works, although the highest shear rates explored in this work were at least one order of magnitude larger. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45277
Effect of pressure on viscosity at high shear rates by using an injection molding machine
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