Free Volume in C60 Modified PPO Polymer Membranes by Positron Annihilation Lifetime Spectroscopy

Share/Save/Bookmark

Kruse, Jan and Rätzke, Klaus and Faupel, Franz and Sterescu, Dana M. and Stamatialis, Dimitrios F. and Wessling, Matthias (2007) Free Volume in C60 Modified PPO Polymer Membranes by Positron Annihilation Lifetime Spectroscopy. Journal of Physical Chemistry B: Materials, surfaces, interfaces, & biophysical, 111 (50). pp. 13914-13918. ISSN 1520-6106

[img] PDF
Restricted to UT campus only
: Request a copy
74kB
Abstract:PPO (poly(2,6-dimethyl-1,4-phenylene oxide)) is a well-known membrane material showing good gas separation properties. The incorporation of nanoparticles can enhance or deteriorate the performance of composite membranes, sometimes depending only on the way of the composite preparation. We have modified the PPO polymer with C60 fullerenes up to a content of 2 wt %. Previous investigations showed a strong dependence of permeability on whether the C60 is simply dispersed in the polymer or chemically bonded to the polymer chains. Free volume effects were suggested as an explanation but not experimentally confirmed. Here, we present free volume studies by positron annihilation lifetime spectroscopy. An additional long positron lifetime shows the increased free volume of composite samples, while the high electron affinity of C60 helps to indicate the homogeneity of the samples. Combining the presented results with permeability measurements refines the understanding of this promising membrane material.
Item Type:Article
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/71615
Official URL:http://dx.doi.org/10.1021/jp074966+
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 243831