1. Viscoelastic properties of copolycarbonates comprising isosorbide and 1,4-cyclohexanedimethanol.
- Author
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Han, Ruiqi, Kida, Takumitsu, and Yamaguchi, Masayuki
- Subjects
GLASS transition temperature ,MODULUS of rigidity ,SHEARING force ,MOLECULAR weights ,POLYCARBONATES - Abstract
Viscoelastic properties of copolycarbonate materials comprising isosorbide (ISB) and cyclohexanedimethanol (CHDM) were studied as a function of the ISB content. In the glassy state, β dispersion was clearly detected in the dynamic mechanical spectra. The tensile storage modulus E′ at room temperature increased with the ISB content, and the glass transition temperature T
g , i.e., peak temperature of α dispersion, increased with the ISB content. It was found from oscillatory shear modulus that the rubbery plateau modulus GN 0 decreased with the ISB content. The entanglement molecular weights Me were found to be 2330–3640, which were slightly higher than that of bisphenol-A polycarbonate and much lower than those of poly(methyl methacrylate) and polystyrene. The onset shear stress of shark-skin failure at capillary extrusion was evaluated and found to increase with the ISB content. [ABSTRACT FROM AUTHOR]- Published
- 2023
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