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.

Redistribution of organic polycarbonate compositions

Abstract: Polyestercarbonates, particularly those containing aliphatic dicarboxylic acid-derived structural units, are redistributed by heating in the presence of a carbonate redistribution catalyst, and, optionally, a diaryl carbonate. The redistribution products have weight average molecular weights different from, and typically lower than, the initial molecular weight.

Shear band formation in polycarbonate-glass bead composites

Abstract: The shear band formation at glass beads embedded in a polycarbonate matrix subjected to a uniaxial tension has been investigated by microscopic in situ observation. The degree of interfacial adhesion was varied by different glass surface treatments. To gain insight into the three-dimensional stress field requirement for shear band formation, the distributions of several elastic failure criteria around an isolated adhering glass sphere in a polycarbonate matrix have been computed with the aid of finite element analysis. It was found that the mechanism for shear band formation is fundamentally different for adhering and non-adhering glass beads. In the case of excellent interfacial adhesion, the shear bands form near the surface of the bead in regions of maximum principal shear stress and of maximum distortion strain energy. In the case of poor interfacial adhesion, shear band formation is preceded by dewetting along the interface between bead and matrix.

Flame retardant aromatic polycarbonate resin composition and molded articles thereof

Abstract: A flame retardant aromatic polycarbonate resin composition comprising: (A) 100 parts by weight of resin components comprising: (A-1) 50 to 100 wt% of an aromatic polycarbonate resin, (A-2) 0 to 50 wt% of a styrene-based resin and (A-3) 0 to 50 wt% of an aromatic polyester resin; and (B) 0.1 to 10 parts by weight of a silicone compound which has (1) an Si-H group content of 0.1 to 1.2 mols/100 g and (2) a content of an aromatic group of formula (1) of 10 to 70 wt%: wherein each X, which may be the same or different, is an OH group or a monovalent organic group having 1 to 20 carbon atoms, and n is 0 or an integer of 1 to 5. A halogen-free polycarbonate resin composition having excellent transparency and dripping preventing properties and molded articles thereof are provided according to the present invention.

Blends of polyamide 6 with bisphenol-A polycarbonate. I. Thermal properties and compatibility aspects

Abstract: Blends of polyamide 6 (PA6) and polycarbonate (PC) have been investigated, over a full range of composition, to check interactions between them. SEM observations show that the mixtures are characterized by domains of clearly segregated homophases and voids between the two polymers. DSC and DMTA data indicate the presence of two Tg' s, corresponding to two separate phases, with the Tg of the PC phase decreasing on increasing the PA6 amount. Moreover, the crystallization kinetics of PA6 is slightly showed down by the PC. Chemical reactions between the two polymers are supposed to give rise to low molar mass compounds, as shown by GPC; these species plasticize the PC and partially dissolve into the molten polyamide, causing decrease of PC Tg and reduction of overall crystallization rate of PA6. Apparent influence of PC on melting temperature and enthalpy of PA6 is also discussed.