Influence of Composition and Crystallizable Block Position within ABC Triblock Copolymers

Influence of Composition and Crystallizable Block Position within ABC Triblock Copolymers 

For a S63EO16C2124 triblock copolymer, a vitreous PS matrix contains minor PCL and PEO contents. It can be deduced from the crystallization behavior from the melt that both PCL and PEO crystallize at maximum su- 

Several of the ABC triblock copolymers with two crystallizable blocks that have been studied include PE as one of the crystallizable components. The PE block can be found either at the end (PE-fr-PS-fo-PCL [94], PE-fo-PEP-fo-PEO [101,119]) or at the center (PS-fo-PE-fr-PCL [98]). When the PE block is located at the center of the copolymer, as is the case in PS-fr-PE-fo-PCL triblock copolymers [94], there are higher constraints on the PE block owing to the absence of free ends. If the PE block is a minor component, confined crystallization with possible homogeneous nucleation is usually encountered. It may be possible that when the PE block does not have free ends, it may be 

Important differences in crystallization behavior were observed between the two crystallizable blocks within PE-fr-PEP-fr-PEO triblock copolymers. The crystallization of PE occurs without confinement from a homogeneous mixture of PE and PEP segments, but for PEO blocks, the crystallization takes place exclusively at high supercoolings in small isolated MDs. 

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