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Self-assembled structures in polystyrene-block- polyisoprene-blend-polystyrene and polystyrene-block-poly(methyl methacrylate)-blend-polystyrene or -blend-poly(methyl methacrylate) in the strong segregation regime
Authors: Holoubek Jaroslav | Baldrian Josef | Hromádková Jiřina | Steinhart Miloš
Year: 2011
Type of publication: článek v odborném periodiku
Name of source: Polymer International
Publisher name: John Wiley & Sons
Place: Bognor Regis
Page from-to: 635-646
Titles:
Language Name Abstract Keywords
cze Samouspořádané struktury v roztocích polystyrenu-blokový polyisopren s polystyren a v roztocích polystyrenu-blokového poly(metyl metakrylát) s polystyrenem nebo poly(metyl metakrylátem) v režimu silné segregace Tato práce se zabývá zkoumáním mikrofází, morfologie a fázového chování v roztocích polystyrenu-blokového polyisoprenu s homopolystyrenem a roztocích polystyrenu-blokového poly(metyl metakrylátu) s homopolystyrenem nebo poly(metyl metakrylátem) v režimu silné segregace za pomocí SAXS a TEM jako funkce složení, molekulárních hmotností homopolymerů a teploty. Je ukázána nová aproximace naměřených dat, která je lepší než dosud používaná aproximace. dvojblokové kopolymery; roztoky homopolymeru a kopolymeru; SAXS; samouspořádání; TEM
eng Self-assembled structures in polystyrene-block- polyisoprene-blend-polystyrene and polystyrene-block-poly(methyl methacrylate)-blend-polystyrene or -blend-poly(methyl methacrylate) in the strong segregation regime This study deals with the investigation of microphase-separated morphology and phase behaviour in blends of polystyrene-block-polyisoprene with homopolystyrene and blends of polystyrene-block-poly(methyl methacrylate) with homopoly(methyl methacrylate) or homopolystyrene in the strong segregation regime using SAXS and TEM as a function of composition, molecular weight of homopolymers, r(M) and temperature. Parameter r(M)was selected to encompass behaviour of the chains denoted as a 'wet brush' (i.e. r(M) < 1). The relative domain spacing increases with increasing concentration of homopolymer and increasing r(M) but depends on the specific implemented morphology. It is shown that the parameters r(M) and chi(3/2)N determine the slope of the D/D(o) versus w(P) relation in the strong segregation regime and the new approximation generally matches the experimental data better than the approximations used so far. diblock copolymers; homopolymer/copolymer blends; SAXS; self-assembly; TEM

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