Polymeric membranes comprised of poly(amidoamine) (PAMAM) dendrimer immobilized in a poly(ethylene glycol) (PEG) network exhibit an excellent CO 2 separation selectivity over H 2. The CO 2 permeability increases with PAMAM dendrimer concentration in the polymeric membrane and becomes 500 times greater than H 2 permeability when the dendrimer content was 50 wt % at ambient conditions (5 kPa of CO 2 partial pressure). However, the detailed morphology of the membrane has not been discussed. The immiscibility of PAMAM dendrimer and PEG matrix results in phase separation, which takes place in a couple of microns scale. Especially, laser scanning confocal microscope captures a 3D morphology of the polymeric blend. The obtained 3D reconstructions demonstrate a bicontinuous structure of PAMAM dendrimer-rich and PEG-rich phases, which indicates the presence of PAMAM dendrimer channel penetrating the polymeric membrane, and CO 2 will preferentially pass through the dendrimer channel. In addition, Fourier transform of the 3D reconstructions indicates the presence of a periodic structure. An average size of the dendrimer domain calculated is 2-4 μm in proportion to PAMAM dendrimer concentration.
|ジャーナル||Journal of Polymer Science, Part B: Polymer Physics|
|出版ステータス||出版済み - 8月 15 2012|
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