Polybisphenol carbonates

Much research has been done on the properties and applications of polybisphenol carbonates since the publication of Schnell s article in 1956 (IS). An extensive account of this work is given in the recently published book by Christopher and Fox (2). Practical application of polycarbonate is based almost exclusively on the properties of this polymer in the amorphous state. 

The self-association by hydrogen bonding of phenol-terminated polybisphenol A carbonate chains, leading to formation of macromolecnlar aggregates of higher hydrodynamic volume, was confirmed by MS, applying the matrix-assisted desorption-ionization (MALDI) method. MALDI is a sensitive method for detection of polymer association in dilute solution (see also Section FV.C.S.a) . 

PEMA polyethylenemethacrylate PCHMA polyeyelohexyl methacrylate) PBAC (polybisphenol A carbon). 

Functionalizations of metal/metal oxide or carbon nanotechnology with polymers are reported in potentiometric pH designs. Li et al. [31] demonstrated a simple fabricated polybisphenol A (PBPA), electropolymerized on indium thin oxide (ITO) for pH sensing. The PBPA/ITO exhibits a sensitivity of 58.6 1.4 mV/pH, near theoretical value, and can be stored for up to 12 days. Possible interferents such as Na", K", Cl, and S04 show no significant response. Jang and coworkers developed self-assembly nanobead polystyrene, deposited on Au/Bi in lab chip sensor. As shown in Fig. 7, the microfluid chip has two ion-selective membranes to H and NO3 species. 

A report is presented on the development of a micro-scale SEC system in which the MALDI matrix solution is coaxially added to the column effluent and directly spotted onto the MALDI targets in a robotic interface. Each spot corresponds to the 10-s elution window from the micro-SEC column, thus yielding a narrow polymer distribution which is amenable to characterisation by MALDI mass spectroscopy. The performance of the system is demonstrated by the characterisation of a polybisphenol A carbonate and a complex dipropoxylated bisphenol A/ adipic acid/isophthalic acid copolyester resin. 29 refs. 

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