Universität zu Köln

Klemmer, Helge F. M., Allgaier, J., Frielinghaus, Henrich ORCID: 0000-0002-8812-8783, Holderer, Olaf ORCID: 0000-0001-6746-7965 and Ohl, Michael ORCID: 0000-0002-8656-8005 (2017). Influence of the amphiphilicity profile of copolymers on the formation of liquid crystalline mesophases in microemulsions. Colloid Polym. Sci., 295 (5). S. 911 - 924. NEW YORK: SPRINGER. ISSN 1435-1536

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Abstract

In bicontinuous microemulsions, the increase of the solubilization capacity of a surfactant, e.g., by the addition of amphiphilic block copolymers (boosting effect), is normally accompanied by the formation of liquid crystalline mesophases. We studied a new class of amphiphilic polymers as boosters, so-called gradient polymers, with a gradual change from the hydrophilic to the hydrophobic part. Phase diagram measurements and static and quasielastic neutron scattering experiments reveal that the polymers cause a stiffening of the amphiphilic film while simultaneously the saddle splay modulus decreases such that the formation of liquid crystalline mesophases, normally present with diblock polymers as boosters, is suppressed, while bicontinuous structures are geometrically favored. In addition, these findings are supported by theoretical calculations following the works of Lipowsky. Hence, gradient amphiphilic polymers not only increase the efficiency of surfactants but simultaneously suppress the formation of liquid crystalline phases thereby greatly increasing their application potential.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Klemmer, Helge F. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allgaier, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Frielinghaus, Henrich UNSPECIFIED orcid.org/0000-0002-8812-8783 UNSPECIFIED Holderer, Olaf UNSPECIFIED orcid.org/0000-0001-6746-7965 UNSPECIFIED Ohl, Michael UNSPECIFIED orcid.org/0000-0002-8656-8005 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-232737
DOI:	10.1007/s00396-017-4080-2
Journal or Publication Title:	Colloid Polym. Sci.
Volume:	295
Number:	5
Page Range:	S. 911 - 924
Date:	2017
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1435-1536
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RANDOM INTERFACE MODEL; BLOCK-COPOLYMERS; PHASE-BEHAVIOR; WATER-OIL; NONIONIC SURFACTANTS; EFFICIENCY BOOSTERS; BENDING RIGIDITY; SYSTEMS; CONFORMATION; SCATTERING Multiple languages Chemistry, Physical; Polymer Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23273