Storage modulus and tg temperature

What is the storage modulus of a polymer?

To expand farther would break covalent chemical bonds, and decomposition would occur. So, the storage modulus reaches a minimum and then becomes independent of temperature. This region of the thermogram is known as the “rubbery plateau.” The storage modulus value in the rubbery plateau is a function of the crosslink density of the polymer.

What is the glass transition temperature Tg of polymers?

J. Rieger, The glass transition temperature Tg of polymers—comparison of the values from differential thermal analysis (DTA, DSC) and dynamic mechanical measurements (torsion pendulum). Polym. Test., 20 (2001) 199–204.

Is loss modulus an indicator of TG?

Step change in loss modulus and Tan δ curve has also been reported as an indicator of Tg [36, 37]. In fact, ASTM STP 1136 considered the reporting of onset of loss modulus, Tan δ and storage modulus important.

What is a storage modulus oint?

point on the storage modulus with the highest magnitude slope in the transition region. This oint is the labelled in the figure on the plot of the derivative of the storage modulus. Th slope at this minimum and the point at which it occurs are used to create another line. Be awar

What is tensile storage modulus (DMA)?

(a) Tensile storage modulus (b) loss factor (tan δ) versus temperature and (c) Tg versus reciprocal Mn of the polyimides. DMA is an effective and sensitive method to determine Tg of polyimide and the DSC curve is shown in the supplementary information (Figure S2).

What is the difference between loss modulus and onset glass transition?

orage modulus at cooler temperatures.GLASS TRANSITION FROM THE LOSS MODULUS AND TAN(δ)The Tg measured from the loss mod lus and tan(δ) signals require much less consideration than the onset glass transition. These two signals often show a distinct peak in the transition region and