Polymer polycarbonate

How does the molecular architecture of the bisphenol molecule affect the physical properties of the final polycarbonate polymer ... 

Pellow-Jarman, M. and Hetem, M., The effect of the polybutylene terephthalate constituent on the reactions occurring in PBT-polycarbonate polymer blends below their decomposition temperature, Plast. Rubber Composites Proc. Appl., 23, 31-41 (1995). 

Figure 11-11 Flowsheet of a process to produce polycarbonate polymer.

J. Katajisto, M. Linnolahti, and T.A. Pakkanen, Effect of branching of cyclo-olefin copolymers and polycarbonate polymers on mechanical and optical properties Ab initio and molecular simulation study, /. Mol. Struct., 758(2-3) 189-194, 2006. 

Bartos, J., Kristiakova, K., Sausa, O., Kristiak, J. (1996) Free volume microstructure of tetramethylpolycarbonate at low temperatures studied by positron annihilation lifetime spectroscopy a comparison with polycarbonate . Polymer, 37(15), 3397. 

Fig. 11-19. Storage (G ) and loss (G") moduli of polycarbonate polymer [5], The broad low-temperature peak is probably composed of several overlapping maxima.

Polycarbonate Polymer with high Tg for sorbing of organic vapors... 

Schnell, H. The Chemistry and Physics of Polycarbonates (Polymer Reviews) Interscience New York, 1964 Vol. 9, 3-227. 

Tsuji, T. Norisuye, T. Fujita, H. Dilute solution of bisphenol A polycarbonate. Polym. J. 1975,... 

The production of the most prominent polycarbonate polymer based on bisphenoi A is the second largest consumer of phosgene, while poly(alkylene carbonates) are obtained from epoxides and C02. 

A. Ram, O. Zilber, andS. Kenig, Life expectation of polycarbonate, Polymer Engineering... 

R, T- Chem, W, J. Koras, H, B. Hopfenberg. and V, T. Stannett, Reversible Isopentane-Induced Depression of Carbon Dioxide Permeation Through Polycarbonate, /. Polym. Sri. Polym. Phys. Ed., 21,753 (1983). 

Polypenco Polycarbonate. [Polymer Corp.] Polycarbonate thermoplastic for stand-off insulators, coil forms, optical and transparent structural components. 

A variety of polymers and copolymers are used for gas separation membranes. To be suitable for gas separation, the polymer must have good permeability and selectivity and the material must be capable of forming a strong, thin, defect-free membrane with good chemical and thermal stability. Commercial gas separation membranes are based on modified cellulose, treated polysulfone or a substituted polycarbonate polymer. Membranes... 

The purpose of obtaining spectral data on the complex refractive Index of polycarbonate polymer was to permit detailed Interpretations to be made of the IR-RA spectra collected In situ on metal-backed films of this material. Several of the principal methods for obtaining the optical constants n and k of an Isotropic medium have been reviewed by Humphreys-Owen [18]. All of the methods outlined are Insensitive to k when k Is close to zero, which Is the case for frequencies between absorbance bands. For this study, a polarlmetrlc technique (method D In Ref. 18) was chosen to obtain the optical constants of BPA-PC. To apply this method, the ratio of surface reflectances Rp/Rg at two large, but well-separated, angles of Incidence (9 ) was obtained for BPA-PC In the IR. Rp Is defined as the reflectance measured for a sample using radiation polarized parallel to the Incidence plane and R... 

An IR absorption spectrum of the polycarbonate polymer used In these determinations Is shown In Fig. 5. A comparison can be made... 

I Blends of pmma and a chlorine containing polycarbonate. Polymer. 24. Sept., 1162 1170 (1983). 

Polycarbonate polymers are formed via a condensation reaction to make a high molecular weight product comprising n repeat units. 

P. Chen, J. Zhang, and J. He. Morphology evolution of a liquid crystalline polymer confined by highly packed glass beads in polycarbonate. Polymer, 46(18) 7652-7657, August 2005. 

Bartos, J., Muller, J., and Wendorff, J. H., Physical ageing of isotropic and anisotropic polycarbonate, Polymer, 31,1678-1684 (1990). 

Montaudo, G., Puglisi, C., Rapisardi, R., and Samp>eri, E, Eurther Studies on the Thermal Decomposition Processes in Polycarbonates, Polym. Deg. Stab, 31, 229, 1991. 

Foti, S., Giuffrida, M., Maravigna, R, and Monfaudo, G., Primary Thermal Fragmentation Processes in Polycarbonates,/. Polym. Sci Polym. Chem. Ed., 21,1567, 1983. 

In the examples provided in this section, combinatorial methods were used to improve the properties of an industrial aromatic polymer, such as melt-polymerized bisphenol-A polycarbonate. The reactions were performed in 96-well microtiter glass plates that served as 96-microreactor arrays in a sequence of steps of increasing temperature with a maximum temperature of 280°C. An example of one of the 96-microreactor arrays after melt-polymerization is shown in Figure 5.3A. For melt-polymerization of bisphenol-A polycarbonate, the starting reaction components included diphenyl carbonate and bisphenol-A monomers and a catalyst (e.g., NaOH). The materials codes used in the examples are presented in Table 5.2. Intermediate species include polycarbonate oligomers and phenol. The bisphenol-A polycarbonate polymer often contains a branched side product that produces a detectable fluorescence signal and other species that can include nonbranched end-groups and cyclics. We used fluorescence spectroscopy for nondestructive chemical analysis of melt-polymerized bisphenol-A polycarbonate. The key attractive... 

Fra Fraser, R. A., Ward, I. M. Temperature dependence of craze shape and fracture in polycarbonate. Polymer 19 (1978) 220-224. 

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