Sub-Relaxation of Bisphenol A Polycarbonate Studied with Dynamic Birefringence
Tadashi INOUE, Kunihiro OSAKI, Hironobu MORISHITA, Hiroyuki TAMURA, and Shuji SAKAMOTO
Abstract:Viscoelasticity and morphology of polycarbonates being multi block copolymers composed of bisphenol A polycarbonate, PC, and polydimethylsiloxane, PDMS, were investigated as a substitute for soft poly(vinyl chloride). Mechanical properties of the soft polycarbonates were found to be well stable for temperature compared with soft poly(vinyl chloride). Modulus of the polycarbonates could be controlled by varying PDMS content. Small angle X-ray scattering experiment and electron microscope revealed that the sort polycarbonates formed microdomain structures. Key Words:Substitute for Poly(vinyl chloride), Polycarbonate, Polydimenthylsiloxane, Viscoelasticity, Birefringence