ABSTRACT
There are several techniques that can be used for dynamic mechanical measurements of polymer. The instruments or approaches to the measurement basically fall into two categories: free oscillation or forced oscillation devices (I). In the former case, the polymer sample is initially displaced and then released to oscillate at its own resonant frequency. Shear modulus and loss tangent are subsequently obtained from the frequency decay rate of oscillations. One of the simplest is torsion pendulum. In this technique, one end of the polymer sample, usually in the form of a plate or a cylindrical rod, is rigidly clamped while the other end is connected by an inertia
rod or disc. The system undergoes a damped sinusoidal oscillation. A spectrum of the storage component and loss component of the dynamic shear modulus (G' and G") and loss factor (tan 8) versus temperature was obtained. This technique is very convenient to stiff samples.
