NDLI: Poly(dimethylsiloxane-urethane) membranes: effect of linear siloxane chain and caged silsesquioxane on gas transport properties

Content Provider	Springer Nature Link
Author	Madhavan, K. Gnanasekaran, D. Reddy, Boreddy S. R.
Copyright Year	2011
Abstract	The effect of poly(dimethylsiloxane) (PDMS) or polypropylene glycol (PPG) linear chain and polyoctahedral oligosilsesquioxanes (POSS) cubic nanoparticles on surface and gas transport properties of poly(dimethylsiloxane-urethane) PDMS-PU or poly(propylene glycol-urethane) (PPG-PU) hybrid membranes were studied. PDMS-PU or PPG-PU hybrid membranes were prepared using PDMS-diol or PPG-diol as a chain extender and diisocyanate with POSS-amine macromonomer as a crosslinker. The macromer synthesized was characterized using FT-IR, $^{1}$H-, $^{13}$C- and $^{29}$Si-NMR spectroscopic methods. The hybrid membranes were characterized by CP-MAS $^{29}$Si-NMR, DSC, contact angle, WAXD, AFM and density measurements. The glass transition temperature (Tg) of the hybrid membranes were determined by differential scanning calorimetry (DSC) and were found to be in the range of 176–189°C. The surface free energy was reduced by increasing the POSS-amine crosslinker content of the membranes. The AFM measurement showed phase separation of POSS-amine molecule and PDMS with the urethane matrix on the surfaces. The XRD profiles confirm that the membranes were highly amorphous in nature. The decrease in permeability was observed by increasing the concentration of POSS-amine incorporated hybrid membranes. The selectivities of O$_{2}$/N$_{2}$ and CO$_{2}$/N$_{2}$ gas pairs increased with an increase in the POSS concentration. This suggests that the selectivities were dependent mainly on the presence of urethane and ester functional groups in the crosslinker.
Starting Page	1851
Ending Page	1861
Page Count	11
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	18
Issue Number	6
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poly(dimethylsiloxane-urethane) Membranes Gas separation POSS Polymer Sciences Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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