Ethylene heterogeneous nucleation/growth

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. ... 

The sphemlite growth rate and bulk crystallization kinetics of OBCs was studied. Rejection of the non-crystallizable soft block from the gro face decreases the crystallization kinetics of OBCs with increasing soft block content. The sphemlite growth rate conformed to the LH analysis and it was shown that a more disordered fold surface is obtained with increasing soft block content. Avrami analysis of bulk crystallization kinetics confirms sphemlitic growth and heterogeneous nucleation. It was also shown that statistical sequences crystallize much slower than ethylene blocks in OBCs. 

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