Poly blends crystallization half-time

Fig. 11.22 Plot of crystallization half-time of poly(butylene terephthalate) as a function of its concentration in blends with poly(efhylene terephthalate), at the indicated crystallization temperatures. (From Escala and Stein (36))...

Fig. 11.33 Crystallization half-time, ti/2, as a function of crystallization temperature, To, for different blend compositions of syndiotactic poly(styrene) with either poly(vinyl methyl ether) or PPO. Composition syndiotactic poly(styrene)-PPO pure syndiotactic poly(styrene) 90/10 80/20. Composition syndiotactic poly(styrene)-poly(vinyl methyl ether) O 90/10 80/20. (From Cimmino et al. (77))...

Fig. 11.41 Plot of crystallization half-time for crystallization of poly(phenylene sulfide) in blends with linear polyethylene and with poly(ethylene terephthalate) as a function of crystallization temperature. Pure poly(phenylene sulfide) . Composition poly(phenylene sulflde)-linear polyethylene blends 50/50 A 75/25 o 90/10. Composition poly(phenylene sulfide)-poly(ethylene terephthalate) blends 50/50 T 75/25 A 90/10. (From Jog et al. (81))...

Fig. 11.7 Plot of half-time, tq.s, for the crystallization of poly(ethylene oxide) against crystallization temperatures of blends of poly(ethylene oxide)-poly(p-vinyl phenol). Composition o 100/0 90/10 80/20 70/30 A 65/35. (From Pedrosa etal. (18))...

The dependence of the overall crystallization rate on the composition of these two blends differs from those of the growth rates.(77) The half-time for syndiotactic poly(styrene) crystallization is plotted against the crystallization temperature for both type blends in Fig. 11.33. The half-times for the pure syndiotactic polymer are represented again by the sohd circles. For this type of measurement the halftimes increase with the addition of either poly(vinyl methyl ether) or PPO. The addition of poly(vinyl methyl ether) causes a larger increase in the half-time and thus a greater reduction in the crystallization rate. The overall crystallization rate is a reflection of both initiation and growth of crystalUzation. Both of these processes... 

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