Polymer polycarbonates

An important direct use of phosgene is in the preparation of polymers. Polycarbonate is the most significant and commercially valuable material (see Polycarbonates). However, the use of phosgene has been described for other polymer systems, eg, fiber-forming polymeric polyketones and polyureas (90,91). 

Janarthanan et al. [67] have employed roughness on a micron scale to enhance the adhesion between two immiscible polymers, polycarbonate and styrene-acrylonitrile copolymer, SAN. Grooves of depths between 5 and 35 p,m were scribed in the polycarbonate surface before laminating the two polymers. The... 

Polymerised butadiene, made by the use of stereospecific catalysts, cis-1,4-Polybutadiene is widely used in tyre tread compounds. An inherently low temperature and low loss polymer. Polycarbonates... 

Some nonconductors, such as the polymers polycarbonates and polystyrenes, must be subjected to a surface treatment prior to activation to ensure good adhesion of palladium nuclei. Surface treatment can include the use of chemical etchants for plastics or reactive gas plasma treatments (66). 

Amorphous polymers are characterized by the following properties They are transparent and very often soluble in common organic solvents at room temperature. The following amorphous polymers have gained industrial importance as thermoplastic materials polyfvinyl chloride), polystyrene, polyfmethyl methacrylate), ABS-polymers, polycarbonate, cycloolefine copolymers, polysulfone, poly( ether sulfone), polyfether imide). 

Electron tunneling reactions were also studied [84] in a rigid polymer (polycarbonate) matrix by following the reductive quenching of a series of excited homologues, Ru(II)(LL)3, of Ru(II)(bpy)3 by a series of aromatic amines, D... 

We have tested the following polymers polycarbonate (PC), poly-carbonate/4% polyethylene blend (PC/PE), poly (ethylene terephthal-ate) (PET), ABS, and impact modified polystyrene (HIPS). All materials except PC were compression molded into nominal Vs-inch sheets. The PC used was an Vs-inch extruded sheet heat-treated in a manner previously described (22). These PC specimens were considered to be... 

Zoller, P., "A Study of the Pressure-Volume-Temperature Relationships of Four Related Amorphous Polymers Polycarbonate, Polyarylate, Phenoxy, and Polysulfone," J. Polym. Sci., Polym. Phys. Ed., 20, 1453 (1982). 

Transition metal catalyzed, ring opening polymerization Dispersion, cationic polymerization Homogeneous/precipitation, cationic polymerization Homogeneous, free radical/cationic polymerization Precipitation, free radical polymerization Dispersion, free radical polymerization Norbornene polymer, polycarbonate Isobutylene polymer Vinyl ether polymer Amorphous fluoropolymers Vinyl polymer, semicrystalline fluoropolymers Polyvinyl acetate and ethylene vinyl acetate copol5Tner... 

Figure 5. Correlation of the apparent solubility at 20 atm and 35 °C with the critical temperatures of various penetrants in a number of glassy polymers polycarbonate,...

JFig. 10 shows some of the simulations from the work for motions with different effective asymmetries. The experiment was applied to JH-13C dipolar couplings in phenylalanine, and a polymer (polycarbonate) as shown in Fig. 11 and was also demonstrated for a membrane peptide using 15N-JH dipolar couplings. 

Because of its excellent physical properties, polycarbonate is specified for a number of engineering uses. Some of these may involve significant exposure to light. As an aromatic polymer, polycarbonate absorbs significantly in the near UV and is thus susceptible to photodegradation. 

When polymers slide on machined metal surfaces, it is quite possible that steady-state wear Involves a combination of abrasive, fatigue, and adhesive wear mechanisms. To study fatigue wear, it would be desirable to minimize the contributions of the abrasive and adhesive wear modes. In this paper, the following polymers polycarbonate, polyvinyl chloride, ultra-high molecular weight polyethylene, siloxane modified epoxies, and polylmldes are tested in experiments in which the fatigue wear mode is predominant. 

The preparation of polymer materials based on heterochain polymer polycarbonates (PC), polyethers, polyethercarbonates (PFC) or joint mixtures of polycondensational and polymerisational polymers [PC with polymethyl methacrylate (PMMA)]. 

ABS PC Alloy See Acrylonitrile Butadiene Styrene Polymer Polycarbonate Alloy. 

Acrylonitrile Butadiene Styrene Polymer Polycarbonate Alloy A thermoplastic processed by injection molding and extrusion, with properties similar to ABS. Used in automotive applications. Also called ABS PC alloy. 

Transition metal catalyzed, ring opening methathesis polymerization Norbomene polymer, polycarbonate... 

Polymers polycarbonate, polyester Ceramics, metaloxides, PTFE, PE... 

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