Tensile mechanical loss tangent

Fig. 8.42. Tensile mechanical loss tangent of polystyrene at 3.5 Hz (from (1441).

Aside from this, the literature on the subject has largely been concerned with dynamic mechanical properties where experiments have been performed to gather data consisting of loss tangent (tan d) and storage tensile modulus (E). Rather than being... 

Temperature dependence of the mechanical tensile storage modulus, loss modulus, and loss tangent the precursor measured with a vibrating reed. The peak maximum frequencies in Hz are indicated. Moduli are in dyn cm". Reproduced from Ref. 45. Copyright 1978 American Chemical Society. 

Figure 12.5 D3Tiamic mechanical analysis (DMA) data of water-swollen PVAc-PBMA/CNC nanocomposites as a function of the PVAc/PBMA ratio. Upon increasing the PVAc content, the tensile modulus (a) decreases, while the loss tangent (tan 5) shifts to lower temperatures (h). The PVAc/ PBMA ratio was 100/0 (A), 60/40 (A), 40/60 (O), 20/80 ( ), 0/100 ( ). Adapted with permission from K. Shanmuganathan, J. R. Capadona, S. J. Rowan and C. WeAer,ACSAppl. Mater. Interfaces, 2010, 2,165-174, Copyright 2009 American Chemical Society.

Commercial equipment is available for monitoring other properties as a function of temperature. In dynamic mechanical analysis (DMA), tensile or shear modulus and loss are measured. In dielectric analysis, dielectric constant and loss tangent are followed. Both provide information about the time response of polymers by applying an oscillating field at a predetermined frequency. At each temperature, the mechanical or electric field test is run at a number of frequencies covering two or more decades. Mechanical frequencies up to 200 Hz are common. Electrical tests can cover greater ranges, say 10-10,000 Hz. 

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