Variation of storage modulus with

Fig. 16 Variation of storage modulus with temperature in CR vulcanizates containing different kinds of nanofillers (a). Circled region is shown in more detail in (b)...

Figure 15.8. Variation of storage modulus with temperature for PP, neat blend and MFCs...

Fig. 5 Variation of storage modulus ( ) with temperature for different percentages of ENR-DGEBA epoxy nanocomposites...

Fig. 21 Variation of storage modulus with time during oscillatory shearing A in the nonlinear regime (yo = 0-5) and B in the linear regime (yo = 0.02). co= 1 rads" ...

Fig. 9.19 (a) and (b) TEM micrograph of MWCNTs with attached ferritin molecules, (c) Temperature variation of storage modulus E Published with permission from American Institute of Physics)... 

Figure 7.5 Dynamic mechanical spectra showing the variation of storage modulus (.S, 9) and loss modulus (E",0) with temperature for emulsion polymers prepared from styrene (50 wt%) and ethyl acrylate (50 wt%) using different processes (adapted from ref. 65).

The rheological behavior of a viscoelastic material can be investigated by applying a small-amplitude sinusoidal deformation. The behavior can be described by a mechanical model, called the Maxwell model [33], consisting of an elastic spring with the Hookean constant, G , and a dashpot with the viscosity, r/<,. The variation of storage modulus (G ) and loss modulus (G") with shear frequency, O), are given by the equations... 

Filler modification affects the viscoelasticity since the variation in storage modulus with strain changes with rate of dispersion. This is illustrated in Fig. 6. The unmodified fillers in mbber cause agglomeration and thus result in high Payne effect due to strong inter-aggregate interaction of filler. With modification, the Payne effect of the filled compounds changes as the filler-filler networks is... 

There are various types of carbon nanofillers which include carbon black, multi walled carbon nanotubes (MWCNTs), and single walled carbon nanotubes (SWCNTs) [27]. In this section the effect of these nano fillers on viscoelastic behavior is thoroughly discussed. The physicomechanical properties of conductive carbon black (CCB) filled ethylene acrylic elastomer (AEM) vulcanizates have been reported by B.P. Sahoo et al. They have discussed thoroughly about the effect carbon black concentration on the viscoelastic behavior of CCB-AEM nanocomposites with respect to temperature variation. Figure 10a, b represents the variation of storage modulus and loss modulus with temperature. It is observed that the value of storage modulus (E ) increased with increase in filler loading in the... 

Fig. 5.22 Variation of storage modulus and Tan 8 with temperature as determined with a DMTA for polycarbonate. The Tg is located at the peak of the Tan 6 curve.

The variation of storage modulus (G ) and loss modulus (G") of the PEN/CNT nanocomposites with the CNT content at different frequencies is shown in Figure 19... 

Figure 12.11 Variation of storage modulus (G ) and loss modulus with angular frequency (co) for (left) P(S-co-BA)-DCTBAB-PCNs and (right) P(S-co-BA)-PCDBAB-PCNs, at 0% ( ), 1% ( ), 2% (0), 3.6% (O) and 5% (A) clay loadings. Reproduced from reference 42 with permission from Elsevier.

Figure 3. (a) Variation of storage modulus along the thickness of the FGPNCs with temperature. 

Figure 3. Variation of storage modulus of TLCP/MWCNT nanocomposites with MWCNT content as a function of frequency.

Another possibility of determining the gel point with the help of rheological methods is dynamical mechanical spectroscopy. Analysis of change of dynamic mechanical properties of reactive systems shows that the gel point time may be reached when tan S or loss modulus G" pass a miximum [3,4,13], Some authors proposed to correlate the gel point with the intersection point of the curves of storage and loss moduli, i.e., with the moment at which tan 5 = 1 [14-16], However, theoretical calculations have shown that the intersection point of storage modulus and loss modulus meets the gelation conditions only for a certain law of relaxation behavior of the material and the coincidence erf the moment of equality G = G" with the gel point is a particular case [17]. The variation of the viscosity... 

Figure 31.3 Variation of the storage modulus with frequency for PET/PEN—clay systems. Source Reproduced with permission from Sanchez-Solis A, Garcia-Rejon A, Estrada M, Martinez-Richa A, Sdnchez G, Manero O. Polym Int 2005 54 1669 [72], Copyright 2005 John Wiley and Sons, Inc.

The mechanical spectra of fully cured adhesive measured by shear rheometry, are shown In Figures 5 and 6. These figures Illustrate how modulus (loss and storage) and tangent delta vary with temperature and frequency. To evaluate the variation of mechanical properties with respect to percent conversion of an adhesive containing low boiling monomers, as In the case with the adhesive of this study. It was decided to assess only property/frequency response. 

Figure 6.16 Typical plots of storage modulus and loss modulus with temperature for a 6% CP-PSMP composite specimen showing variations of Tg with programming cycle...

EFigure 2. Variation of storage shear modulus, G, with frequency, w, for PPBC and its blends with different... 

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