Record number :
Title of article :
3D analysis of the lattice defects in the gyroid network structure of a block copolymer/homopolymer blend – The line-like defects in the gyroid network structure
Author/Authors :
Satoshi Akasaka، نويسنده , , Tetsuro Okamoto، نويسنده , , Taketsugu Osaka، نويسنده , , Tadashi Matsushita، نويسنده , , Hirokazu Hasegawa and Kaoru Yamanouchi، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
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Abstract :
The line-shaped defects formed in the gyroid bicontinuous microdomain structures in the solution-casting process of a blend of polystyrene-block-polyisoprene (SI) diblock copolymer and homopolystyrene (HS) were investigated using 3D electron tomography. The inclusion-type lattice defects composed of segregated HS formed during the morphological transition from the preexisted sponge phase to the stable gyroid phase induced by the phase separation between SI and HS. The gyroid grains grew by consuming the sponge phase and expelling excess HS as well as by impinging each other. Consequently, some expelled HS was trapped as the line-like inclusions in the gyroid grains. Structural rearrangement occurred so that low energy planes of the gyroid phase are facing the HS inclusions while the gyroid structure became continuous across/around the inclusions.
Keywords :
Block copolymer , Microdomain structure , Gyroid , Electron tomography , Lattice defect
Journal title :
European Polymer Journal(EPJ)
Link To Document :