Statistical copolycarbonates containing different bisphenol A/tetramethyl bisphenol A (BPA/TMBPA) molar ratios were synthesized by polycondensation reaction between a mixture of the two bisphenols and phosgene. The reaction conditions were selected for producing polymers having comparable molecular weights (M̄n≈9000 g/mol) but different composition, and the same composition but different molecular weights. The calorimetric properties of the products were investigated by differential scanning calorimetry (DSC) and dynamical-mechanical thermal analysis (DMTA). In particular, the effect of the copolymers molecular characteristics on the glass transition temperature (Tg) and the related relaxation processes were studied. DMTA was employed for evaluating the effect of macromolecular structure on the γ low temperature relaxation peak.
Thermal properties of aromatic polycarbonates copolymers based on bisphenol A and tetramethyl bisphenol A
PENCO, Maurizio;SARTORE, Luciana;
2005-01-01
Abstract
Statistical copolycarbonates containing different bisphenol A/tetramethyl bisphenol A (BPA/TMBPA) molar ratios were synthesized by polycondensation reaction between a mixture of the two bisphenols and phosgene. The reaction conditions were selected for producing polymers having comparable molecular weights (M̄n≈9000 g/mol) but different composition, and the same composition but different molecular weights. The calorimetric properties of the products were investigated by differential scanning calorimetry (DSC) and dynamical-mechanical thermal analysis (DMTA). In particular, the effect of the copolymers molecular characteristics on the glass transition temperature (Tg) and the related relaxation processes were studied. DMTA was employed for evaluating the effect of macromolecular structure on the γ low temperature relaxation peak.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
