As a membrane material, namely, poly-T-benzyl-L-cysteine(PBC) and poly-S-carbobenzoxy-L-cysteine (PCBC) were synthesized by modifying Poly-L-cysteine(PC). Thin film composite membranes of PC, PBC and PCBC were prepared by casting dilute solutions of polymer on aromatic copoly(amide-ester) (PA) support, and their permeability characteristics to gaseous oxygen and dissolved oxygen in water were measured. The permeability coefficients of gaseous oxygen in gas/gas system (P_g) and dissolved oxygen in water/water system (P_w), P_w/P_g, and the selectivity of oxygen to nitrogen (P_O2/P_N2) depend on the properties of the side chains of the coated polymers. Both P_g and P_w increase with increasing length of the side chains, in the order of PC < PBC < PCBC. However, P_O2/P_N2 and P_w/P_g increase in the order of PCBC < PBC < PC.

Poly-L-cysteine (PC) 및 그 유도체로서 Poly-S-benzyl-L-cysteine (PBC), poly-S-carbobenzoxy-L-cysteine (PCBC)을 합성하여 이를 막소재로 gas/gas system 및 water/water system에서 의 기체 투과 특성을 검토하였다. Water/water system에서 polypeptide chain의 degradation 방지 및 물리적 성질을 보완하기 위하여 지지체로 aromatic copoly (amide-ester) (PA)를 합성하여 복합막 (composite membrane)을 제조하였다. 복합막의 제조방법 및 유도체의 side chain 변화에 따른 기체투과특성을 검토한 결과 산소의 투과계수(P_O2)는 gas/gas, water/water system 모두 PC O2/P_N2) 및 가스상태의 산소의 투과계수에 대한 용존상태의 산소의 투과계수비 (Pw/Pg)는 PCBC< PBC

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