Microscopic Visualization of Nanostructures of Cellulose Derivatives

Autor:	Stephanie Hornig, Thomas Heinze, Stephanie Hesse, Tim Liebert
Rok vydání:	2005
Předmět:	chemistry.chemical_classification Nanostructure Polymers and Plastics Chemistry Organic Chemistry Polymer Condensed Matter Physics Micelle Polyelectrolyte chemistry.chemical_compound Membrane Chemical engineering Polymer chemistry Materials Chemistry Surface roughness Mica Cellulose
Zdroj:	Macromolecular Symposia. 223:253-266
ISSN:	1521-3900 1022-1360
DOI:	10.1002/masy.200550518
Popis:	Microscopy has proved to be a valuable tool for the investigation of supermolecular structures of cellulose derivatives. Thus, with AFM it was possible to show that statistically functionalized derivatives (degree of substitution below 3) form specific aggregates called fringed micelles. In contrast, derivatives with a non-statistic distribution exhibit a more network-like structure as known for galactomannans consisting of block-like structures. If samples are prepared by deposition of dilute solutions of polyelectrolytes on mica and drying at elevated temperature, the formation of nanorings is observed. In addition, AFM and REM were applied to investigate the morphology of membranes prepared of cellulose esters with unsaturated substituents. It was shown that cross-linking of the polymer chains in the membranes does not lead to a change in the nanostructure of the surface, i.g., the surface roughness and the pore sizes were not modified.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b5f74f7f17d419e4d603a10e32600f5d https://doi.org/10.1002/masy.200550518 Zobrazit plný text záznamu Plný text