Characterization of two new stable block copolymer mesophases by synchrotron small-angle scattering

Bürger, Christian; Micha, Marc André; Oestreich, S.; Förster, Stephan; Antonietti, Markus

doi:10.1209/epl/i1998-00266-0

Cited by 27 publications

(29 citation statements)

References 11 publications

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“…There have been no systematic explorations of this concept to date, although various studies are relevant. 22,23 The key step is to develop chemistry in which may be varied progressively but over a very large range. For example, values as large as 10 or 100 may be necessary.…”

Section: Sssrmentioning

confidence: 99%

Synthesis and self‐assembly of fluorinated block copolymers

Hillmyer

Lodge

2001

J. Polym. Sci. A Polym. Chem.

134

132

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Fluorinated block copolymers combine the unique properties of fluoropolymers and the intriguing self-assembly of hybrid macromolecules. The preparation of the title molecules by selective fluorination procedures and the effect of fluorine incorporation on the material thermodynamics are presented. We highlight two fluorination schemes developed in our laboratory, difluorocarbene and perfluoroalkyliodide additions to polydienes, that allow for the selective and tunable incorporation of different fluorinated groups into model block copolymers. The fluorination changes the physical properties of the parent materials and leads to interesting changes in the component incompatibilities. The role of fluorination in determining block copolymer thermodynamics in both the solid state and in solution and in ultimately exploiting fluorination to produce novel, higher order structures is central to our research efforts.

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Section: Sssrmentioning

confidence: 99%

Synthesis and self‐assembly of fluorinated block copolymers

Hillmyer

Lodge

2001

J. Polym. Sci. A Polym. Chem.

134

132

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“…The setup of the conventional generator has been thoroughly described before 7) . The measurements were performed in an s range of 1.0 N 10 -2 nm -1 a s a 9.0 N 10 -1 nm -1…”

Section: Small Angle X-ray Scattering (Saxs) and Data Evaluationmentioning

confidence: 99%

Mesophase structures of solid poly( N ‐alkylacrylamides) as revealed by SAXS

Antonietti¹,

Bürger

Micha

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Small angle X-ray scattering (SAXS) on films of poly(N-alkylacrylamides) with various chain lengths reveals that these well known polymers exhibit a microphase-separated solid-state structure with liquid crystalline order. Analysis of the phase morphology in dependence on the alkyl side chain length results in the following scenario: For the C 8 and C 10 tail, the microphases are just weakly developed and quantitative analysis of the broad scattering peak reveals an ill-defined structure without sharp phase boundaries. For the C 12 and C 14 derivative, we found a well developed mesophase, which shows a number of scattering peaks and cannot be related to any classical phase morphology. For these two materials, a phase model is developed on the base of a new technique of quantitative evaluation of the X-ray data. Poly(N-hexadecylacrylamide) and poly(N-octadecylacrylamide) exhibit lamellar morphologies with low long range order. Poly(N-octadecylacrylamide) obtained by polymerization instead of polymer reaction exhibits a different phase morphology which resembles the so-called sponge-like phase. The different phase morphologies are also reflected in the thermal behavior where the sponge phase shows a lower melting point and melting enthalpy of the side chains than the lamellar mesophases, regardless of the longer alkyl chains involved in this system.

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“…The reasons for so much interest arise from their ability to form micelles, macro-or microemulsions, and several liquid crystalline phases [4][5][6][7]. Applications are focused on the cosmetics, detergent, and paint industries [8].…”

Section: Introductionmentioning

confidence: 99%