Abstract
Spherulite growth rates have been determined for a set of poly(ethylene oxide) fractions ranging in molecular weight from 104 to 106. At a given crystallization temperature the spherulite growth rate as a function of molecular weight passes through a maximum. At a given undercooling (as assessed by the method of Mandelkern) the spherulite growth rate is a monotonically decreasing function of molecular weight, and in the range 6000 <M̄v < 50 000 varies roughly as (M̄v)−3. The free energy of formation of the end interface (as assessed by nucleation theory) also decreases as molecular weight increases.
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