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Thermal Properties of Aromatic Polycarbonates Copolymers Based on Bisphenol A and Tetramethyl Bisphenol A
Author(s) -
Penco Maurizio,
Sartore Luciana,
Della Sciucca Stefania,
Di Ladro Luca,
Grassia Luigi,
D'Amore Alberto
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200551002
Subject(s) - bisphenol a , glass transition , dynamic mechanical analysis , differential scanning calorimetry , bisphenol , copolymer , materials science , polymer chemistry , polymer , thermal analysis , condensation polymer , chemical engineering , thermal , composite material , thermodynamics , epoxy , physics , engineering
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 (M̄ n ≈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 (T g ) and the related relaxation processes were studied. DMTA was employed for evaluating the effect of macromolecular structure on the γ low temperature relaxation peak.