Growth rate against crystallization temperature

Fig. 9.9 Plot of spherulite growth rates against crystallization temperature for indicated molecular weights. (From Magill (24))...

Fig. 9.88 Plots of log growth rate against crystallization temperature for poly(ethylene oxide) molecular weight fractions, (a) Af = 1890 (b) Afn = 2780 (c) Mn = 3900 (d) = 9970. extended chain crystallites o folded chain...

Fig. 9.91 Plot of In growth rate against crystallization temperature for two iinear polyethylene fractions. Circles Mw = 3900, = 3390 squares Mw = 5800,...

Fig. 9.93 Plot of log growth rate against crystallization temperature for two low molecular weight fractions of isotactic poly(propylene) a A/ = 2000 A Mn =...

Fig. 10.36 Plot of spherulite growth rate against crystallization temperature for copolyimides described in text for indicated 134APB/C12 compositions. (From Hsaio et al. (83))...

Fig. 13.27 Plot of growth rate against crystallization temperature for a linear polyethylene fraction, A/w = 4050, crystallizing from p-xylene at indicated concentrations. (From Leung et al. (52))...

The relation between the growth rate and crystallization temperature of low molecular weight fractions of isotactic poly(propylene) follows a pattern similar to poly(ethylene oxide) and polyethylene. Figure 9.93 is a plot of log growth rate against the crystallization temperature for two fractions of isotactic poly (propylene), M = 20(X) and = 3000.(319) The curves are similar to those of the other... 

Figure 4.53 Plots of the growth rate of the spherulites against crystallization temperature for PHB-CE blends with different compositions neat PHB, PHB-CEl blends (filled circles) and PHB-CE2 blends (open circles). Numerals on curves indicate the cellulose ester (CE) mass fraction...

The crystal growth rates plotted against crystallization temperature exhibit cusps over various temperature ranges. These are associated with the growth... 

Fig. 9.8 Plot of spherulite growth rates against time for poly(ethylene adipate), M = 9900, at indicated crystallization temperatures. (From Takayanagi (23))...

Discontinuities are also observed in plots of the growth rate against the crystallization temperature for low molecular weight polymers. The polymers studied... 

Fig. 4.29 (a) Lamellar growth rates for PEO as function of crystallization temperature Tc (inset lamellar dimensions vs. crystallization time) and (b) lamellar thickness plotted against inverse undercooling. The linear fit of the lamellar thickness vs. inverse undercooling plot with the boundary condition (0,0) yields a satisfactory result. Adapted with permission from [52]. Copyright 2002. American Chemical Society... 

The crystallization rate was further investigated by the measurement of ti/2 in DSC experiments. The ti/2 represents the overall crystallization rate and is determined by the rates of nucleation and linear growth. A plot of the half-life times against the crystallization temperature is shown in Figure 11.1. 

To determine the parameters Go and Kg, one needs to measure the growth rate G(7). For materials with slow crystallization kinetics, one can easily measure the spherulite growth rate as a function of temperature from micrographs (Fig. 4.2). Then Gq and Kg are determined by plotting In G + W/Rg T - T ) against T + T ) jlT AT. 

Fig. 9.95 Log-log plot of spherulite growth rate, Gs, against viscosity average molecular weight, My, for poly(ethylene oxide) fractions. Crystallization temperatures °C 0 53.4 53.5 55.7 56.9 A 58.2 59.1. (From Maclaine and Booth (326))...

Fig. 9.96 Log-log plot of spherulite growth rate, G, against number average degree of polymerization, x for poly( e-caprolactone) fractions. Crystallization temperatures indicated. (From Chen et al. (327))...

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