Block copolymers strongly segregated systems

Strongly segregated systems, Todt > Tc < Tg with hard confinement. A strictly confined crystallization within MDs has been observed for strongly segregated diblock copolymers with a glassy amorphous block [29-42]. 

Polyethylene-fi-poly(ethylene oxide) diblock copolymers (PE-6-PEO) represent an interesting double-crystalline diblock copolymer system since both blocks are strongly segregated and at the same time they have a marked tendency to crystallize in view of their highly flexible linear chains [20]. Hillmyer et al. [271] synthesized PE-6-PEO block copolymers of 2.1 and 2.8 kg/mol from hydroxyl terminated poly(l,4-butadiene) catalytically... 

The combination of careful chemical synthesis with NSE and SANS experiments sheds some light on the fast relaxation processes observed in the collective dynamics of block copolymers melts. The results reveal the existence of an important driving force acting on the junction points at and even well above the ODT. Modelling the surface forces by an expression for the surface tension, it was possible to describe the NSE spectra consistently. The experimental surface tension agrees reasonably well with the Helfand predictions, which are strictly valid only in the strong-segregation hmit. Beyond that, these data are a first example for NSE experiments on the interface dynamics in a bulk polymer system. 

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