Polycarbonates (PCs) are typical amorphous glassy polymers, which do not crystallize below the glassy transition temperature [T.sub.g].
The material used in the tests is PC Lexan 141R with the mass density [rho] = 1,200 kg/[m.sup.3] and the glassy transition temperature [T.sub.g] = 148[degrees]C.
When temperature is above [T.sub.1], tan [delta] begins to increases rapidly and PVB enters the glassy transition region and begin to translate from glassy state to rubbery state.
Both fifth order GM model and FD model can characterize the viscoelasticity of PVB at glassy transition area.
Then, shear modulus and tangent delta measurement, Payne effect, glassy transition
determination, thermal expansion coefficient, fatigue tests, creep and stress relaxation may be measured with one single Viscoanalyzer.
where [C.sub.1] and [C.sub.2] are constants to define from test data and [T.sub.o] the glassy transition
This plateau is formed when the rubbery core undergoes a glassy transition
at zero cavity pressure [ILLUSTRATION FOR FIGURE 10 OMITTED].