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• W2077857597 abstract "Recently crystallization of block copolymers in confined domains has been extensively studied. Crystallization in confined environments is usually initiated by homogeneous nucleation at large supercooling. Thus the crystals formed are highly imperfect and have lower crystallinity, compared with the crystals formed under normal crystallization conditions. As a result, the possibility of reorganization of these less perfect crystals into more ordered crystals is of great interest. Such reorganization can be achieved by melting–recrystallization or solid-solid transformation. Rottele et al. investigated melting behavior of strongly segregated poly(butadiene)-b-poly(ethylene oxide) (PB-b-PEO) block copolymers with spherical PEO domains. They observed that PEO crystals with different degrees of perfection could be produced when crystallization of PEO takes place in the confined spherical domains and the less perfect crystals transform into more perfect ones by reorganization in the solid state, but reorganization by melting–recrystallization is prohibited. Chen also observed coalescence of different crystalline domains after annealing the confined domains of PB-b-PEO block copolymer. However, reorganization of confined crystals via melting–recrystallization has not been reported so far. Confined crystallization behavior of semicrystalline block copolymers is strongly influenced by segregation strength of the two blocks and the morphology in the ordered melt. The effects of these two factors on reorganization of the block copolymer crystals have not been reported. In the present work, an oxyethylene/oxybutylene, generally believed to be a weakly segregated block copolymer, was blended with amorphous poly(oxybutylene) homopolymer. Two blends with B 1⁄4 0:76 (cylinder morphology) and B 1⁄4 0:83 (sphere morphology), respectively, were prepared and both exhibited confined crystallization behavior. Reorganization of the PEO crystals in confined domains of different shapes was studied with differential scanning calorimetry (DSC) and synchrotron small angle X-ray scattering (SAXS) at different heating rates." @default.
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• W2077857597 date "2005-01-01" @default.
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• W2077857597 title "Melting–Recrystallization of Block Copolymer Crystals in Confined Environments" @default.
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• W2077857597 doi "https://doi.org/10.1295/polymj.37.43" @default.
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