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Polycarbonate

About: Polycarbonate is a research topic. Over the lifetime, 14032 publications have been published within this topic receiving 141740 citations. The topic is also known as: PC & Polycarbonate, PC.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the effect of polymer-penetrant interactions and polymer backbone structure on the temperature dependence of the transport and sorption properties of gases in membrane separation processes.
Abstract: The permeabilities and solubilities of five gases are reported for bisphenol-A polycarbonate (PC), tetramethyl polycarbonate (TMPC), and tetramethyl hexafluoro polycarbonate (TMHFPC) at temperatures up to 200°C. The temperature dependence of permselectivity is discussed in terms of solubility and diffusivity selectivity changes with temperature for CO2/CH4 and He/N2 gas separations. The activation energies for permeation and diffusion and the heats of sorption are also reported for each gas in the three polycarbonates. Analysis of these values provides a better fundamental understanding of the effect of polymer-penetrant interactions and polymer backbone structure on the temperature dependence of the transport and sorption properties of gases in membrane separation processes. Important factors affecting the solubility and diffusivity selectivity losses or gains with increased temperature are also identified through correlation of these data with physical properties of the gases and polymers. These conclusions provide a framework for choosing the most promising membrane materials for particular gas separations at elevated temperatures. © 1994 John Wiley & Sons, Inc.

112 citations

Journal ArticleDOI
TL;DR: In this paper, three polymer/silica nanocomposites were prepared by a single-screw extrusion approach: poly(methyl methacrylate), polystyrene and polycarbonate/sica nan composites.
Abstract: Three polymer/silica nanocomposites were prepared by a single-screw extrusion approach: poly(methyl methacrylate), polystyrene and polycarbonate/silica nanocomposites. The resulting nanocomposites were subjected to comprehensive studies of mechanical, thermal and flammability properties. All materials showed improved mechanical performance and thermal stabilities, although they are not strictly flame retardant when subjected to fire tests like Oxygen Index or horizontal Bunsen burner tests. However, the nanocomposites showed reduction in peak heat release rates and total heat release when evaluated by cone calorimetry. Moreover, the polycarbonate showed improvement in flammability according to vertical burning tests. All polycarbonate materials subjected to vertical burning testing are V2 rated, but after flame times with 1% silica were significantly reduced. A flame retardant mechanism is proposed in order to understand the relationship between interfacial interaction and flammability of polymer/silica nanocomposites. Copyright © 2006 John Wiley & Sons, Ltd.

112 citations

Journal ArticleDOI
TL;DR: In this article, a modified version of the Dreiding force field was used in simulations of Bisphenol A polycarbonate, 4,4'-isopropylidenediphenylbis(phenyl carbonate).
Abstract: Molecular simulations of Bisphenol A polycarbonate were performed using a modified version of the Dreiding force field. In general, the simplicity of this generic force field was maintained. However, a few parameters were optimized by using ab initio calculations in order to generate better backbone torsional potentials. The validity of this modified force field was tested on a model compound similar to polycarbonate, 4,4'-isopropylidenediphenylbis(phenyl carbonate). The crystallographic data obtained from simulations of the model compound agreed well with the experimental data. The modified force field was then used in simulations of the glassy polymer

111 citations

Patent
27 Nov 2006
TL;DR: An impact modified thermoplastic molding composition comprising aromatic polycarbonate and/or polyester carbonate and a rubber modified graft polymer prepared by the bulk, solution or bulk-suspension polymerization process is disclosed in this article.
Abstract: An impact modified thermoplastic molding composition comprising aromatic polycarbonate and/or polyester carbonate and a rubber-modified graft polymer prepared by the bulk, solution or bulk-suspension polymerization process is disclosed. The composition that is characterized by its low content of lithium ions features improved hydrolytic resistance.

110 citations

Patent
20 Sep 1988
TL;DR: In this paper, a graft copolymer is obtained by graft polymerization of 95 to 10% by weight of at least one vinyl monomer onto a polyorganosiloxane rubber which exhibits a degree of swelling of 3 to 30 as measured in toluene at 25°C.
Abstract: OF THE DISCLOSURE A polycarbonate resin composition excellent in chemical resistance, weather resistance, heat resistance, and low-temperature impact resistance, which comprises, either a polycarbonate resin (A) or a mixture (A') of the polycarbonate resin and a saturated polyester and/or a polyester elastomer and either a siloxane based graft copolymer (B) obtained by graft polymerization of 95 to 10% by weight of at least one vinyl monomer onto 5 to 90% by weight of a polyorganosiloxane rubber which exhibits a degree of swelling of 3 to 30 as measured in toluene at 25°C, contains constitutional units derived from a graft-linking agent, and has an average particle size of 008 to 08 µm or a mixture (B) of the siloxane-based graft copolymer and a vinyl polymer, wherein the component (B) is blended so that the content of the polyorganosiloxane rubber may be from 05 to 60% by weight based on the whole resin composition

110 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023248
2022471
2021184
2020294
2019390
2018403