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Polymer crystallization temperature-dependence curve

Comparison of the data shown in Figure 10 with d values from the diffraction pattern in Figure 11 indicate (Figure 11a) that the mesomorphous component (a narrow reflex), d, is independent of poly(decamethylcyclohexasiloxane) chain tacticity. Hence, irrespective of trans-tactic polymer abi-lity to crystallization, the mesophase temperature range changes insignificantly. At lower tempera-ture of -73°C only, a bending on the temperature dependence curve, d(T), of the mesophase peak occurs. [Pg.238]

F igiire 6.1. Temperature dependence of Apicr nd Api, (o), concentration dependence of AGm for solution (the single-phase state) (6), and the dependence of the melting temperature of polymer crystals on polymer concentration in solution (the liquidus curve) (c) (Schematic)... [Pg.754]

An example of the temperature dependence of the storage and loss moduli E and E" at 110 Hz for single crystal mats of polyethylene is shown in Fig. 16-9. By crystallization at different temperatures, samples and lamella thicknesses from 94 A to 167 A were prepared. Curves for the polymer crystallized from the melt in bulk are also shown. " ... [Pg.466]

Free crystallization (i.e., no strain or stress) starts from a number of point nuclei and progresses in all directions at equal linear rates (i.e., the rate of increase of the radius of a spherulite, G, is linear with time). The rate of growth is very dependent on the temperature of crystallization. In particular, G = 0 at 7g and and passes through a maximum at some intermediate temperature, Tk. According to Gandica and Magill (1972) the crystallization process of all the normal polymers follows a master curve. This master curve is a plot of G/Gmax versus a dimensionless temperature, 6 ... [Pg.138]

Many polymers, after irradiation at low temperature, give off light when allowed to warm. This phenomenon of thermoluminescence depends not only on the chemical structure but also on crystal morphology. In polyethylene, for example, peaks in the thermoluminescence glow curve correspond, respectively, to the crystalline and the amorphous regions (9, 19, 22) (Figure 2). [Pg.20]


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