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Disorder-order-crystalline state transitions of PEO-b-PPO-b-PEO copolymers and their blends: SAXS/WAXS/DSC study
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SYSNO ASEP 0322636 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Disorder-order-crystalline state transitions of PEO-b-PPO-b-PEO copolymers and their blends: SAXS/WAXS/DSC study Title Přechody struktury kopolymerů PEO-b-PPO-b-PEO a jejich směsí mezi neuspořádaným, uspořádaným a krystalickým stavem . Studium pomocí SAXS, WAXS a DSC Author(s) Baldrian, Josef (UMCH-V)
Steinhart, M. (DE)
Amenitsch, H. (DE)
Bernstorff, S. (DE)Number of authors 4 Source Title Journal of Macromolecular Science - Physics - ISSN 0022-2348
Roč. 48, č. 1 (2009), s. 174-184Number of pages 11 s. Language eng - English Country US - United States Keywords triblock copolymers ; blends with homopolymer ; structure development Subject RIV CD - Macromolecular Chemistry CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000262108800014 DOI 10.1080/00222340802566150 Annotation The structure in the symmetrical triblock copolymers PEO-b-PPO-b-PEO and their blend with PEO, studied by small angle x-ray scattering (SAXS), wide angle x-ray scattering (WAXS), and differential scanning calorimetry (DSC), pass from melt to the solid state on cooling. On subsequent heating back to the melt, they pass through disordered and ordered molten states, crystalline structure, and finally back to a disordered melt state. At high temperatures these systems are in the melt in the disordered state approximately described by the mean-field theory. The characteristic lengths of these systems, obtained from SAXS, are proportional to Rg. At lower temperatures, their structure changes to a disordered state which can be described by the concentration fluctuation theory. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2009
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