Bisphenol Z polycarbonate

Peak Notation Assignment of Main Peaks Molecular Weight Retention Index Relative Intensity 

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Figure 6 shows the field dependence of hole mobiUty for TAPC-doped bisphenol A polycarbonate at various temperatures (37). The mobilities decrease with increasing field at low fields. At high fields, a log oc relationship is observed. The experimental results can be reproduced by Monte Carlo simulation, shown by soHd lines in Figure 6. The model predicts that the high field mobiUty follows the following equation (37) where d = a/kT (p is the width of the Gaussian distribution density of states), Z is a parameter that characterizes the degree of positional disorder, E is the electric field, is a prefactor mobihty, and Cis an empirical constant given as 2.9 X lO " (cm/V). ...

Kluin, J.-E., Yu, Z., Vleeshouwers, S., McGervey, J. D., Jamieson, A. M., and Simha, R., Temperature and time dependence of free volume in bisphenol A polycarbonate studied by positron hfetime spectroscopy. Macromolecules, 25, 5089-5093 (1992). 

Linear and cyclic structures of polycarbonates from bisphenol-A, from bisphenol-Z, and from 4,4 -dihydroxydiphenyl-3,3-pentane, were determined by PSD MALDI-TOF experiments. It was foimd that the fragmentation behavior of these polycarbonates depends on the substituents boimd to the central carbon atom of the bisphenol unit. The cleavage of the polymer backbone is suppressed, and the spectra are dominated by the loss of side groups. PSD MALDl spectra of these polycarbonates could be acquired only from Li adduct ions, because the sodium or potassium cationized adduct ions yield only dissociation of the cation from the polymer. ... 

Melt polymerization of bisphenols (bisphenol A, bisphenol P, bisphenol AF, and bisphenol Z) with diphenyl carbonate in CO2 with several catalysts have been achieved (91,92). Polymers with number-average molecular weights ranging from 2.2 X 10 to 1.1 X 10 g/mol M = 4.5 x 10 to 2.7 x 10 ) were obtained over a range of reaction temperatures (180-250°C) and CO2 pressures [20.7-24.1 MPa (207-241 bar)]. Reaction conditions were chosen to ensure efficient removal of solubilized condensate (phenol) without extracting the reactants (diphenyl carbonate). Polycarbonate synthesis from bisphenol A and diphenyl carbonate catalyzed by tetraphenylphosphonium tetraphenyl borate were also performed in SCCO2 (93) (eq. (9)). 

Denchev Z, DuChesne A, Stamm M and Fakirov S (1998) Sequence length determination in poly(ethylene terephthalate)-bisphenol-A polycarbonate random copolymers by application of selective degradation, J Appl Polym Sci 68 429-440. 

Sobiczewski, Z. Wielgosz, Z. Stability of polycarbonates prepared from chlorinated bisphenols. Plaste Kautschuk 1968, 15, 176-179. 

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