Topic
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.
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Patent•
10 Apr 1981TL;DR: A coated ultraviolet radiation stabilized polycarbonate article having improved abrasion, mar, scratch, and chemical solvent resistance comprising a polycarbonated article with its surface layers impregnated with an ultraviolet radiation absorbing compound having at least one surface thereof coated with (i) an adhesion promoting primer layer comprised of a thermoset acrylic polymer; and (ii) a top coat disposed on said primer layer comprising of a colloidal silica filled thermosets organopolysiloxane as discussed by the authors.
Abstract: A coated ultraviolet radiation stabilized polycarbonate article having improved abrasion, mar, scratch, and chemical solvent resistance comprising a polycarbonate article with its surface layers impregnated with an ultraviolet radiation absorbing compound having at least one surface thereof coated with (i) an adhesion promoting primer layer comprised of a thermoset acrylic polymer; and (ii) a top coat disposed on said primer layer comprised of a colloidal silica filled thermoset organopolysiloxane.
41 citations
TL;DR: In this paper, results from different techniques on amorphous polybisphenol-A carbonate (NMR, dielectric, mechanical) in the temperature range -150 C to room temperature were reviewed.
41 citations
Patent•
02 Jul 1981TL;DR: In this paper, a polymer blend which is capable of exhibiting an anisotropic melt phase and the ability to form shaped articles having improved mechanical properties is provided, and the polymer blend comprises approximately 5 to approximately 75 percent by weight, based upon the total weight of the blend, of a polycarbonate and approximately 25 to approximately 95 percent by Weight based on the total load of a melt processable wholly aromatic polyester.
Abstract: A polymer blend which is capable of exhibiting an anisotropic melt phase and the ability to form shaped articles having improved mechanical properties is provided. The polymer blend comprises approximately 5 to approximately 75 percent by weight, based upon the total weight of the blend, of a polycarbonate and approximately 25 to approximately 95 percent by weight, based upon the total weight of the blend, of a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase apart from the blend.
41 citations
TL;DR: In this article, the effect of thermodynamic phase equilibrium on the kinetics of semibatch melt polycondensation of bisphenol-A and diphenyl carbonate was studied for the synthesis of polycarbonate.
Abstract: The effect of thermodynamic phase equilibrium on the kinetics of semibatch melt polycondensation of bisphenol-A and diphenyl carbonate was studied for the synthesis of polycarbonate. In the melt-polymerization process, a partial loss of diphenyl carbonate occurs as the reaction by-product phenol is removed from the reactor. To obtain a high molecular weight polymer under high temperature and low-pressure conditions, a stoichiometric mol ratio of the two reactive end groups needs to be maintained during the polymerization. In this work, vapor–liquid equilibrium data for a binary mixture of phenol and diphenyl carbonate are reported and they are used in conjunction with the Wilson equation to calculate the exact amounts of diphenyl carbonate and phenol returned from a reflux column to the reactor. A good agreement between the reactor model simulations and the experimental polymerization data was obtained. It was also observed that diphenyl carbonate is quickly consumed during the early stage of polymerization and the fraction of evaporated diphenyl carbonate refluxed to the reactor is essentially constant during this period. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1253–1266, 2001
41 citations
TL;DR: In this paper, an amino-lysis mechanism is proposed to explain the enhanced adhesion between the interface of a bisphenol-A polycarbonate substrate with an alkoxysilane containing sol-gel coating when 3-aminopropyltriethioxysilanes (3-APS) is used as a primer.
Abstract: An aminolysis mechanism is proposed to explain the enhanced adhesion between the interface of a bisphenol-A polycarbonate substrate with an alkoxysilane containing sol-gel coating when 3-aminopropyltriethoxysilane (3-APS) is used as a primer Both a model solution study and surface analyses of polycarbonate substrates exposed to 3-APS indicate that the latter reacts with the carbonate groups in the polycarbonate chain by forming urethane linkages With 3-APS bonded to the substrate, a sol-gel coating can be chemically bonded to the substrate through hydrolysis of alkoxysilane groups and subsequent silanol condensation Consequently, enhanced adhesion between the sol-gel coating and the substrate is achieved
41 citations