Polycar bonate

Nobile et al. [3] reported that viscosity of a polycar-bonate-TLCP blend can increase or decrease in the same system at the same temperature, depending on the shear condition. At very low shear rates the viscosity was found to increase with TLCP loading, whereas at high shear rates a significant drop was observed. But in all of these cases, the way in which the TLCPs alter the bulk polymer flow is not yet well understood. 

Grey Polycar- bonate White Polycar- bonate Polyure- thane Modified Polyphenyl ene Oxide... 

Property Acetal Polycar- bonate Polyphe- nylene Oxide Poly- sulfone Nylon 66... 

Flame retardants that are often nsed in polycarbonate/ABS plastics (such as in compnter indnstry) include nonhalogen triaryl phosphates, such as RDP [resorcinol bis (diphenyl phosphate)] and BDP [bisphenol A bis(diphenyl phosphate)]. As BDP has lower phosphorus content compared to that of RDP, more of it should be used to match the flammability performance of RDP. In one particular study using polycar-bonate-ABS alloy, 9% of RDP or 12.3% of BDP was employed and showed equal to each other and excellent flame retardant properties [8]. 

Since their introduction in 1967, ABS/polycar-bonate blends [Grabowski, 1964] have enjoyed a dramatic growth in market volume. They are by far the largest volume polycarbonate blends... 

In the engineering polymer blends, a number of advances in the technology and the commercial areas have been realized in the past decade. New commercial polymers have been manufactured by various combinations of preexisting polymers. One of the major areas has been with polyesters and polycarbonates (polybutyleneterephthalate/ polycarbonate polyethyleneterephthalate/polycar-bonate polyarylate/polycarbonate cyclohexane dimethanol based polyesters/polycarbonate). 

E.J. Vandenberg, and D. Tian, A new, crystalline high melting bis(hydroxymethyl)polycar-bonate and its acetone ketal for biomaterial appKcations, Macromolecules, 32 (11), 3613-3619,1999. 

Figure 3-89. Flexural Creep vs Time at 75 F for Polycar bonate ...

Preferential absorption of OSO4 has been shown [95] to reveal spherulites in semicrystalline PET. Stefan and Williams [96] work on ABS-polycar-bonate blends also showed contrast by selective absorption. The dark SAN polymer, in this latter study, contains the osmium stained rubber particles while the polycarbonate was not stained. Niimoni et al. [97] found that there is often enough phase contrast in stained copolymers which have different degrees of unsaturation or functional groups like -OH, -0-, or -NH2, as they each vary in reactivity with the stain. A specially constructed pressure bomb was developed by Edwards and Phillips [98] in order to... 

Polymer Poly- NN NN/SBR Block copolymer Poly- MNN Polycar- bonate - ABS Resin... 

The experiments are performed on polycarbonate films with high optical quality that are prepared as follows. Commercially available 2,2-bis(4-hydroxy phenyl)propane-polycar-bonate granulate (Bayer, m=. S g) and coumarin 6 (m = 120 mg) are dissolved in tri-chloromethane V = 10 ml). The solution is carefully spread over a cellulose acetate sheet with a thickness of 200 pm. After drying a film of about 3 pm results with a dye concentration of 0.3 M. The thin film is detached from the cellulose acetate substrate and used as a free standing film. 

Guy, M. Recycle polycarbonate plastic, ezine articles. ezinearticles.com/ Recycle-Polycar-bonate-Plastic id=1680662 2008. 

Conductivities of unsubstituted molecules are summarized in Table 11, field effect mobilities can be taken from Table 10. In older papers a strong dependence of the mobility on the chain-length was found [342, 343, 354, 355] although a nearly independent mobUity is expected. From newer data [100, 333, 334, 356] this independence can really be determined. Therefore the older data are masked by structural disorder and/or impurities. The decrease in mobility observed for a-8T and polythiophene may also stem from an increase of conjugation defects. The lack of field effect in a-3T can be explained because this chain is regarded to be too short to bear a radical cation but extrapolation of data obtained in a-3T/polycar-bonate mixtures with different a-3T concentrations to the pure oligomer yield /i = 3.3 X IQ- cm V- s [357]. 

Schmiedbauer J, Sybert PD (2000) In Legrand DG, Bendler JT (eds) Handbook of polycar bonate science and technology. Marcel Dekker, New York... 

Moreover, many siHcone-based copolymer or composite films have been manufactured by mixing siloxane with other organic polymers for improving the physical properties of the pure silicone such as selective gas permeability. Thus, polyethersulfone-PDMS [42], polyamide-PDMS [43], poly(phenylsilsesquioxane)-PDMS [44], and even polycar-bonate-PDMS [45] and polyacrylate-PDMS [27] were prepared and doped with dyes to carry out permeability tests for optical sensing purposes. 

---