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Issue 40, 2012
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Controlling morphology and porosity of porous siloxane membranes through water content of precursor microemulsion

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Abstract

Here we report a facile method for controlling the morphology and porosity of porous siloxane membranes through manipulation of the water content of precursor microemulsions. The polymerizable microemulsion precursors consisted of a methacrylate-terminated siloxane macromonomer (MTSM) as the oil phase, nonionic surfactant (Teric G9A8), water, and cosurfactant (isopropanol). Photo-polymerization of the oil phase in the parent microemulsion solutions resulted in polymeric solids, and subsequent removal of the extractable components yielded porous PDMS membranes. The pre-cured parent microemulsion solutions and post-cured polymers were characterized by small angle X-ray scattering (SAXS) while the nanostructures of extracted porous polymer membranes were characterized by SAXS, scanning electron microscopy (SEM) and mercury porosimetry. The results indicated that nano- and micro-structures of the membranes could be modulated by the water content of the precursor microemulsions. Further, in situ photo-rheometry was used to follow the microemulsion polymerization process. The rate of polymerization and the mechanical properties of the resulting PDMS membranes also depend on the water content of precursor microemulsions. This study demonstrates a simple approach to the fabrication of a variety of novel porous PDMS membranes with controllable morphology and porosity.

Graphical abstract: Controlling morphology and porosity of porous siloxane membranes through water content of precursor microemulsion

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Article information


Submitted
06 Jun 2012
Accepted
07 Aug 2012
First published
04 Sep 2012

Soft Matter, 2012,8, 10493-10501
Article type
Paper

Controlling morphology and porosity of porous siloxane membranes through water content of precursor microemulsion

S. Peng, P. G. Hartley, T. C. Hughes and Q. Guo, Soft Matter, 2012, 8, 10493
DOI: 10.1039/C2SM26312B

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