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

journal contribution
posted on 2012-01-01, 00:00 authored by Shuhua Peng, P Hartley, T Hughes, Qipeng Guo
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.

History

Journal

Soft matter

Volume

8

Issue

40

Pagination

10493 - 10501

Publisher

Royal Society of Chemistry

Location

Cambridge, England

ISSN

1744-683X

eISSN

1744-6848

Language

eng

Publication classification

C1 Refereed article in a scholarly journal