Lamellar structure of block copolymer poly(oxyethylene-oxypropylene-oxyethylene) in xylene/water mixtures

Journal Article · Mon Sep 26 04:00:00 EDT 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00098a033· OSTI ID:7181368

Wu, G; Ying, Q; Chu, B ^[1]

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1. State Univ. of New York, Stony Brook, NY (United States)

Synchrotron small angle X-ray scattering (SAXS) was used to study the supramolecular structure formed by a block copolymer, Pluronic L64 (PEO[sub 13]PPO[sub 30]PEO[sub 13]), in xylene/water mixtures. Lamellar structure was observed at very high polymer concentrations (e.g., C[degree] > 0.53 g/ml). The lamellar spacing was determined by the amount of solubilized water and the copolymer concentration, with the amount of water playing a more important role on the lamellar spacing than the copolymer concentration. The lamellar spacing was almost independent of temperature. However the scattering peak became broader with increasing temperature, implying that the micellar size became smaller. Experimental data could be fitted by the Teubner-Strey model, and the resulting periodicity was in good agreement with the lamellar spacing derived by using the Bragg equation.

• DOE Contract Number: FG02-86ER45237
• OSTI ID: 7181368
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 27:20; ISSN MAMOBX; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
COPOLYMERS
LAMELLAE
MATHEMATICAL MODELS
MICELLAR SYSTEMS
MOLECULAR STRUCTURE
MORPHOLOGY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
SCATTERING
SMALL ANGLE SCATTERING
TEMPERATURE DEPENDENCE