Universität zu Köln

Grassberger, Lena, Koch, Karin, Oberhoffer, Roland, Muller, Alexander, Klemmer, Helge F. M. and Strey, Reinhard (2017). Blowing agent free generation of nanoporous poly(methylmethacrylate) materials. Colloid Polym. Sci., 295 (2). S. 379 - 390. NEW YORK: SPRINGER. ISSN 1435-1536

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Abstract

In this article, we demonstrate a newly developed technique for generation of nanoporous polymer materials. Generally, the production processes of polymeric nanostructured materials require high pressure due to the handling of gaseous blowing agents. Our new approach allows to generate nanoporous polymer materials without blowing agent at ambient conditions. Starting from a crosslinked polymer gel swollen with a mixture of at least two specially selected solvents leads to a nanoporous material by sequential evaporation. We varied the pore size of the generated structures between 80 and 800 nm so that the effect of the pore size on the gaseous thermal conductivity could be analyzed. Decreasing the pore size of the materials, the gaseous thermal conductivity could be reduced considerably. Thus, we developed a blowing agent free technique which allows the generation of nanoporous polymer materials-Knudsen materials-at an ambient pressure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Grassberger, Lena UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch, Karin UNSPECIFIED UNSPECIFIED UNSPECIFIED Oberhoffer, Roland UNSPECIFIED UNSPECIFIED UNSPECIFIED Muller, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Klemmer, Helge F. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strey, Reinhard UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-241080
DOI:	10.1007/s00396-017-4012-1
Journal or Publication Title:	Colloid Polym. Sci.
Volume:	295
Number:	2
Page Range:	S. 379 - 390
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 BUILDING INSULATION MATERIALS; SUPERCRITICAL CARBON-DIOXIDE; COHERENT EXPANDED AEROGELS; CELL-GROWTH CONTROL; OF-THE-ART; THERMAL-CONDUCTIVITY; BIOABSORBABLE POLYMERS; MICROCELLULAR FOAM; EXTRUSION SYSTEM; ORGANIC AEROGELS Multiple languages Chemistry, Physical; Polymer Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24108