Crystallite size rate poly

In LCP blends with PBT, the increase in crystallinity is associated with the decrease in crystallite size (nucleation favored) when LCP concentration is low (20%). At high LCP content the increase in crystallinity is associated with the increasing crystallite size suggesting the favored growth of crystal domain. Poly(ethylene 2,6-naphthalate), PEN, spherulite dimensions decrease in the presence of LCP. This is caused by a heterogeneous nucleation by the crystallized LCP particles on the molten PEN matrix. Also presence of LCP nucleates poly(ether imide) increasing its crystallization rate. ... 

Nucleation is a bulk property to be described by a rate, r )., per unit volume. Experiments on ensembles of pm sized melt droplets allow a determination when the nucleation time t uc is much longer than the time required by the expanding crystallite to cover the whole droplet. Figure 5.20 shows results of such an experiment conducted for poly(ethylene oxide) (PEO). As expected for a bulk property, the observations on ensembles of droplets with various volumes V show that... 

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