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고분자 PDMS에 chitosan을 0.02∼0.60 wt%까지 넣어 복합막을 제조하였고, SEM과 TGA에 의해서 막의 특성을조사하였다. 기체투과 실험은 30°C, 4 kg/cm2 조건에서 수행하였고, 복합막의 함량 변화에 따른 H2와 N2의 투과도와 선택도를 조사하였다. PDMS-chitosan 복합막의 H2와 N2 투과도는 chitosan 함량이 증가하면 0∼0.20 wt%까지는 증가하고 그 이상에서는 감소하였다. 그리고 선택도(H2/N2)는 0∼0.20 wt%까지는 감소하고 0.20∼0.60 wt% 범위에서는 증가하였다. PDMS 고분자에 chitosan이 도입되어졌을 때 PDMS의 열적 안정성이 향상되었고, chitosan 함량이 증가했을 때 복합막의 표면은 거칠어지고 홀이 생성되었다.
The PDMS-chitosan composite membranes were prepared by addition of 0.02∼0.60 wt% chitosan to PDMS. In order to investigate the characteristics of these membranes, we used the analytical methods such as SEM and TGA. Gas permeation experiments was performed in 30°C, 4 kg/cm2, the permeability and selectivity of H2 and N2 according to con-tent change in composite membrane were investigated. The permeability of H2 and N2 for the PDMS-chitosan composite membranes increased when 0∼0.20 wt% chitosan was added, and then decreased at higher wt% as chitosan content increased. The selectivity (H2/N2) of PDMS-chitosan composite membranes decreased when 0∼0.20 wt% chitosan was add-ed, and then increased as chitosan content increased. In the case of PDMS-chitosan in which chitosan was inserted to PDMS, thermal stability of PDMS was enhanced. Based on SEM observation, as the chitosan content within PDMS in-creased, the surface of the composite membranes became coarse and began to form holes.
