Crystallization Behavior of PE-g-LCP Copolymers

The crystallization kinetics of PE-g-SBH copolymers obtained by polycondensation (COP) or reactive blending (COP 120) has been investigated under 

The results have shown that the crystallization behavior and morphology of COP 120 are more similar to those of the neat components of PE and SBH. This explains the fact that COP 120 is more effective as a compatibilizer for PE/SBH blends than COP. 

Concerning compatibilized blends, the interfacial behavior of the compatibilizer has an important effect upon the crystallization of the blended components as it was shown for crystaHine/crystalline polymer blends (60,65-67) and for crystalline polymer/LCP blends (32,37,38,68). For the latter blends, the enhanced phase interactions and improved interfacial adhesion could increase the above-mentioned nucleation activity of the LCP toward the crystallizable matrices. In the particular case of using polyolefin-g-LCP copolymer compatibilizer, the crystallization of the two blend phases might have a reverse effect upon the compatibilizing activity. Moreover, the miscibility (69,70) and/or cocrystallization (60) between the bulk homopolymers and corresponding segments of the copolymer could strongly influence the crystallization behavior of the blends. 

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