The poly(γ-methyl _??_-glutamate) (PMLG) membranes containing an oligo siloxane (SiG) and/or a trichloroethyl (TEG) groups in a side chain region were prepared, and their structure and gas transport properties were investigated. The secondary structure of the membranes used here was α-helix as well as a PMLG membrane. From the results of X-ray diffraction and density measurements, it can be said that the side chain regions of the membranes containing SiG and TEG became sparse and dense, respectively, compared with PMLG membrane. The solubilities of CO
2 for the membranes containing SiG and TEG were low because of SiG having low solubility and the dense side chain region, respectively. On the other hand, the diffusion coefficient of CO
2 for the membrane containing SiG whose mobility was high, increased with SiG content. For the membrane containing TEG, in contrast, the diffusion coefficient of CO
2 was decreased by forming the dense side chain region. In comparison with PMLG, the permeabilities of CO
2 for both the membranes containing SiG and TEG became low. This finding showed that low solubility of SiG mainly contributed to the permeability although the diffusion coefficient increased.
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