Eldridge-Ferry plot

Figure 6-14 Eldridge-Ferry Plots In c p versus l/Fm for Low-Methoxyl Peain + Calcium Gels. No sugar, 0.1 mol L NaCl, pH 7.0, for two different R ratios ( ) R = 0.42 and ( )/( = 0.54.

Fig. 43. Eldridge-Ferry plots for poIy(vinyl aloobol)/ethyleK ycol-water in mixtures of ethylene glycol and water of various ethylene glycol contents in mole fraction mf (O) 1 mh (O) 0.794 ml ( ) 0.4S8mf ( ) 0l3S7iii( (A) 0.222 mf (A) ai47mf ( ) 0.087 mf ( ) 0.04 mC Reproduced from Polym J [Rdl 175] by tte courtesy of the authors and The xaety of Polymer Science, Japan...

Figure 8.2 shows the result of our modified Eldridge-Ferry plot for the gel melting concentration. The gel melting temperature Tm is estimated from the temperature at which the DSC heating curve shows an endotherm peak. The slope of the solid lines with... 

Fig. 2 Modified Eldridge-Ferry plot for poly(vinyl alcohol) gel in water. Gelation concentration at constant molecular weight (solid lines) and at constant temperature (dotted lines) are plotted against a combined variable lO P + InM...

The plot of the reciprocal melting temperature against the log concentration of agarose with various molecular weights, the so-called Eldridge-Ferry plot, is shown in Fig. 4 [215]. From the plot in Fig. 4, it is found that the enthalpy for the crosslink point elimination is independent of the molecular weight and is approximately 1.3 x 10 kJ/mol. The ratio of the enthalpy between the elimination and formation of the crosslink... 

Fig. 4 Eldridge-Ferry plot of the melting temperature of agarose solution.

Method 1—Eldridge-Ferry approach (Eldridge and Ferry, 1954) data at different temperatures, and plot of the slope of Ln bT versus t Depending on molecular weight. 

Fig. 8.2 Modified Eldridge-Ferry analysis for aqueous poly(vinyl alcohol) solutions. The gel melting concentration c measured at a constant temperature for different molecular weight polymers plotted against the molecular weight finds the junction multiplicity from the slope (broken lines), while those measured at constant molecular weight by changing the temperature find the number of the repeat units per chain in the junction (solid lines). (A) 91°C ( ) 87°C (O) 83 C ( ) 78°C (A) 74°C (o) 71 (Reprinted with permission from Ref. [6].)...

Since A and B are complex functions of the temperature, (10.58) suggests that it is experimentally impossible to find the standard enthalpy A Ho of cross-linking-which is contained in the factor A(T)-by the conventional Eldridge-Ferry method, which plots ln0 against l/k T. 

---