Poly Bisphenol-A Carbonate PC

Figure 27 (a) Thermogravimetry (TG) and derivative TG (DTG) curves of poly(bisphenol-A-carbonate) (PC) (b) total ion current (TIC) DPMS of PC. Reprinted with permission from Puglisi et al. [69]. Copyright 1999, American Chemical Society. 

Polymer blends based on a polyester and a polycarbonate have been shown to be immiscible provided no transesterification reaction occurs (Porter Wang, 1992). Heat treatment of the same blends yielded different degrees of compatibility depending on the temperature and duration of the treatment, as well as on the presence and type of catalyst. This method has been successfully used to increase the compatibility of different polymers with poly(bisphenol-A-carbonate) (PC). 

In this section, we test the behavior of the NET-GP procedure for a gas-polymer mixture whose solubility has been characterized in both equilibrium and non-equilibrium conditions, that is, above and below the glass transition temperature Tg of the polymer. In Figure 2.1 we plot the value of the infinite dilution solubility coefficient of CO2 in poly(bisphenol-A) carbonate (PC) as a function of the inverse absolute temperature, as measured by Wang and Kamiya l The infinite dilution solubility coefficient, Sq, expressed in cm (STP)/(cm atm), is the slope of the solubility isotherm, in the limit of very low pressures ... 

The thermal decomposition processes occurring in poly(bisphenol-A carbonate) (PC) have received continued attention in the literature, since this polymer is an important engineering thermoplastic that is subjected to injection... 

In another study, ammonolysis of the main-chain carbonate groups (Scheme 7.6), followed by FAB-MS analysis, was performed to characterize the pyrolysis residue of poly(bisphenol-A carbonate) (PC). °... 

The end-groups present in poly(bisphenol A carbonate) (PC) have been identified by MALDI-TOF methods.MALDI spectra of two poly-disperse PC samples (PCI and PC2), recorded in reflection mode with a mass resolution of about 3000 fwhm, show well-resolved peaks up to 16000 Da (Figure 10.25). The inset expansions in Figure 10.25 show the presence of peaks belonging to six mass series, assigned in Table 10.3, which are desorbed as sodiated ions accompanied by less intense potassiated adducts. 

Liquid chromatography at the critical condition (LCCC) is performed at the elution-adsorption transition. It can be used to separate macromolecules with different functionalities such as chains with different chain ends or to separate linear chains from cycles. LCCC was used [77] to separate cycles from linear chains in poly(bisphenol-A-carbonate) PC. Figure 45.20 contains the LCCC trace. The trace is bimodal, with two bands, Z1 and Z2. The MALDI spectrum of Z1 displayed a large number of peaks, ranging approximately from 2.0 to 10 kDa, due to PC chains terminated with n-butyl on one side or on both sides. The MALDI spectrum of Z2 was far less crowded. It is made of cycles and one can note the systematic absence of linear chains. This implies that the LCCC separation is perfect. 

Chloroform Poly(styrene-co-acrylonitrile) (PSAN) cellulose acetate (CAc) polysulfone (PSu) poly(bisphenol A carbonate) (PC) poly(methyl methacrylate) (PMMA)... 

Fig. 26 Plot of the surface coverage,

Poly(bisphenol-A carbonate) (PC) is an important engineering thermoplastic material, which is subjected to injection moulding operations at temperature above 300 °C. At this temperature, degradation reactions are likely to occur 732351, and therefore the understanding of its thermal behaviour is of crucial importance in the end-use applications 895472 891434 888765 882593 856011 [a.71]. The thermal decomposition of PC 882592 855971 (Scheme 29) has been investigated by heating isothermally at 300, 350,400 and 450 °C and subsequent analysis of the pyrolysis residue by means of MALDI mass spectrometry 870570 766615. ... 

Insight into the polymerization of poly(bisphenol-A-carbonate (PC) was obtained from the MALDI-TOF spectrum. The spectrum consisted of two series of peaks corresponding to molecular ions of cyclic oligomers (m/z at 254 -I- 23) and open-chain ethyl carbonate terminated compounds (m/z 254n -I-141). The presence of the ethyl-terminated oligomers indicates that the polymerization reaction was stopped by addition of ethanol [49]. 

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