Self-Assembly in Mixtures of Poly(vinyl methyl ether) and Polystyrene-block-polyisoprene. 1. Formation of Nanocolloidal Spheres
| Autor: | Jeffrey Bodycomb, Hirokazu Hasegawa, Takeji Hashimoto, Norio Iizuka |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Polymers and Plastics Small-angle X-ray scattering Organic Chemistry Ether Light scattering Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Transmission electron microscopy Polymer chemistry Materials Chemistry Copolymer Polystyrene Self-assembly Polymer blend |
| Zdroj: | Macromolecules. 31:7256-7266 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | We studied phase behavior and molecular assembly in blends of poly(vinyl methyl ether) (PVME) and polystyrene-block-polyisoprene (SI) by small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and light scattering. The neat block copolymer forms bcc (body centered cubic) spheres composed of polyisoprene block chains in a matrix of polystyrene block chains. On casting from a toluene solution, the blends with volume fractions of PVME less than or equal to 0.3 experienced only microphase separation, resulting in a structure with spherical microdomains of polyisoprene block chains (PI) in a matrix of polystyrene block (PS) chains (PS-corona) mixed with PVME, while the blends with volume fractions of PVME greater than 0.3 underwent macrophase separation into a PVME-rich region and an SI-rich region which was also microphase-separated. Furthermore, a thermoreversible one- to-two-phase transition induced by the change of segmental interactions between PS-corona and PVME was observed for the ... |
| Databáze: | OpenAIRE |
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