Phase Separation in Polymer Blends and Diblock Copolymers Induced by Compressible Solvents

Autor:	Vijayakumar S. RamachandraRao, MA Pollard, GD Brown, Thomas P. Russell, James J. Watkins
Rok vydání:	1999
Předmět:	Materials science Polymers and Plastics Organic Chemistry Sorption Methacrylate Lower critical solution temperature Supercritical fluid Styrene Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Phase (matter) Polymer chemistry Materials Chemistry Copolymer Polymer blend
Zdroj:	Macromolecules. 32:7737-7740
ISSN:	1520-5835 0024-9297
Popis:	The influence of compressed carbon dioxide sorption on the phase behavior of polymer blends and diblock copolymers exhibiting lower critical solution temperatures (LCSTs) and lower disorder-to-order transitions (LDOTs), respectively, was studied using in situ high-pressure small-angle neutron scattering. Homogeneous blends of poly(deuterated styrene) and poly(vinyl methyl ether) phase separate at temperatures more than 115 °C below the ambient pressure LCST upon sorption of less than 3.3 wt % CO 2 . The LDOTs in symmetric poly(deuterated styrene)-block-poly(n-butyl methacrylate) copolymers having total molecular weights of 78 000 and 32 000 g/mol are depressed by as much as 250 °C upon exposure to supercritical CO 2 at modest fluid-phase densities.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::42e69183fd9cb16bb10a6f88967ebae3 https://doi.org/10.1021/ma9906377 Zobrazit plný text záznamu