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Self-assembled structures in d(8)-polystyrene-block-polyisoprene/polystyrene blends in the weak segregation regime: SAXS and TEM study
Authors: Holoubek Jaroslav | Baldrian Josef | Hromádková Jiřina | Steinhart Miloš
Year: 2009
Type of publication: článek v odborném periodiku
Name of source: Polymer International
Publisher name: John Wiley & Sons
Place: Bognor Regis
Page from-to: 762-774
Titles:
Language Name Abstract Keywords
cze Samouspořádané struktury v d(8)-polystyrén-blok-polyisopropen/polystyrénové směsi v režimu slabé segregace: Studium pomocí SAXS a TEM Autoři se zabývají studiem morfologie mikrofázově separovaných blokových kopolymerů A-b-B s rodičovským homopolymerem (dPS-b-PI). Bylo zkoumáno fázové chování dPS-b-PI s polystyrenem molekulové váhy: 4k, 8k a 17k5. Byly připraveny směsi s různým obsahem homopolymeru, které vykazují ODT. Pro vysvětlení změn mikrodoménové morfologie během samouspořádání bylo aplikováno kriterium suchého a mokrého kartáče . Bylo ukázáno, že rozhodující roli hraje poměr molekulových vah homopolymeru a odpovídajícího bloku kopolymeru. dvojblokové kopolymery;směsi homopolymer/kopolymer;SAXS;SANS;TEM;vlastní uspořádání
eng Self-assembled structures in d(8)-polystyrene-block-polyisoprene/polystyrene blends in the weak segregation regime: SAXS and TEM study The study includes investigation of the microphase-separated morphology of block copolymer A-block-B with the parent homopolymer A, where A is polystyrene and A-block-B is poly(perdeuterated styrene)-block-polyisoprene) (dPS-block-PI). The microdomain morphology and phase behavior in blends of dPS-block-PI with polystyrene of Mw = 4000, 8000 and 17500 were investigated. Binary blends of the diblock copolymer and homopolymers were prepared with various amounts of homopolymers and the blends display ODT transition. The criterion for ?wet or dry brush? morphologies taking into account different solubilization of homopolymer has been applied to explain the changes in microdomain morphology during the self-assembling process. It has been shown that the decesive role in the resulting micromorphology is played by the ratio of the relative size of the homopolymer molecular weight to the molecular weight of the corresponding copolymer block diblock copolymers;homopolymer/copolymer blends;SAXS;SANS;self-assembly;TEM

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