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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TL;DR: With increasing cross-link density, wear was reduced and ripple formation was suppressed and the cross-linking density was the dominating material parameter characterizing wear.
Abstract: In this paper, we describe atomic force microscope (AFM) friction experiments on different polymers. The aim was to analyze the influence of the physical architecture of the polymer on the degree and mode of wear and on the wear mode. Experiments were carried out with (1) linear polystyrene (PS) and cycloolefinic copolymers of ethylene and norbornene, which are stabilized by entanglements, (2) mechanically stretched PS, (3) polyisoprene-b-polystyrene diblock copolymers, with varying composition, (4) brush polymers consisting of a poly(methyl methacrylate) (PMMA) backbone and PS side chains, (5) PMMA and PS brushes grafted from a silicon wafer, (6) plasma-polymerized PS, and (7) chemically cross-linked polycarbonate. For linear polymers, wear depends critically on the orientation of the chains with respect to the scan direction. With increasing cross-link density, wear was reduced and ripple formation was suppressed. The cross-linking density was the dominating material parameter characterizing wear.
51 citations
Patent•
12 Jun 1999TL;DR: In this article, a polycarbonate/ABS plastic molding materials containing phosphazenes and inorganic nanoparticles which exhibit excellent flame protection and very good mechanical properties are described.
Abstract: The invention relates to polycarbonate/ABS plastic molding materials containing phosphazenes and inorganic nanoparticles which exhibit an excellent flame protection and very good mechanical properties.
51 citations
Patent•
30 Apr 2008TL;DR: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
51 citations
TL;DR: In this paper, a homogenous polycarbonate/cyanate ester network has been prepared from a renewable, eugenol-derived bisphenol, and no phase separation was observed either during or after cure, suggesting that a homogeneous network was generated.
51 citations
TL;DR: In this paper, the synthesis of aromatic polyphosphonates based on the step polymerization of various bisphenols and dichlorophenyl phosphine oxide was investigated, and the effect of catalyst, type, concentration, and polymerization time were systematically varied to obtain high molecular weight polymers.
Abstract: The synthesis of aromatic polyphosphonates based on the step polymerization of various bisphenols and dichlorophenyl phosphine oxide was investigated. The effect of catalyst, type, concentration, and polymerization time were systematically varied to obtain high molecular weight polymers. Very high molecular weight tough, ductile materials with a high degree of optical clarity were synthesized. In contrast with the aromatic polycarbonates, the refractive index was increased from 1.58 to 1.60 (for the bisphenol A-based system) and 1.64 for a biphenol-based system. The latter was still an amorphous soluble polymer as a result of the non-coplanar nature of the phenyl phosphine oxide bond, unlike the analogous polycarbonate. Hydrolytically stable melt-processable cumyl phenol end-capped polyphosphonates were successfully achieved for the first time. Rheological studies show that these end-capped systems are melt-stable at 200 °C, whereas the systems of initially higher molecular weight but without any well-defined end capping clearly degraded quickly probably as a result of an acid-catalyzed hydrolysis process. Extensive high char yields were produced upon pyrolysis in either nitrogen or air, suggesting good fire resistance. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 2904–2910, 2001
51 citations