학술논문
상전이-압출 알루미나 분리막 제조 공정에서 혼합 고분자 바인더 적용에 따른 성능 및 특성 평가
Performance and Characterization of Ceramic Membrane by Phase Inversion-Extrusion Process with Polymer Binder Mixing
Performance and Characterization of Ceramic Membrane by Phase Inversion-Extrusion Process with Polymer Binder Mixing
Document Type
Article
Source
멤브레인, 33(6), pp.439-446 Dec, 2023
Subject
Language
한국어
ISSN
2288-7253
1226-0088
1226-0088
Abstract
세라믹 분리막은 높은 열적, 화학적 안정성을 갖기 때문에 극한의 조건에서 운전되는 다양한 산업 공정에 적용할수 있다. 그러나 투과도와 기계적 강도의 trade-off 현상에 의한 세라믹 분리막 활용에 제약이 있어, 고투과성-고강도 분리막의 개발이 필요하다. 본 연구에서는 상전이-압출법으로 알루미나 중공사 분리막을 제조하고, 고분자 바인더의 종류와 그 혼합비에 따른 분리막의 특성 변화를 관찰하였다. 용매인 DMAc (Dimethylacetamide)와 고분자 바인더의 한센 용해도 인자를 비교하면, PSf (polysulfone)가 DMAc와 높은 용해도 특성을 갖기 때문에 도프 용액의 점도와 토출압력이 높게 나타나 분리막내부가 치밀한 구조로 형성되기 때문에 높은 기계적 강도를 갖으나 수투과도가 감소하는 것으로 확인되었다. 그에 반해, PES(polyethersulfone)를 이용하여 분리막을 제조하면 기계적 강도가 다소 감소하고 수투과도가 증가하는 것으로 나타났다. 따라서 분리막 성능과 물성을 최적화하기 위해 PSf와 PES를 혼합하여 분리막을 제조하였으며, 9:1로 혼합하여 제조된 분리막에서 최적화된 수투과도와 기계적 강도를 얻을 수 있었다.
Ceramic membranes are generally used for various industrial processes operating under extreme conditions becauseof its high thermal and chemical stability. However, due to the trade-off phenomenon of permeability and mechanicalstrength, preparation of high permeability-high strength membrane is necessary. In this study, the change in characteristicsand performances of ceramic membranes was analyzed depending on the type of polymer binder and its mixing ratio. Because the solubility between solvent and polymer binder was higher in PSf (polysulfone) than in PES (polyethersulfone),the viscosity and discharge pressure of the PSf-based dope solution were higher than those of PES-based dope solution. When PSf was used as a polymer binder, ceramic membrane showed high mechanical strength and low water permeabilitydue to the dense structure. On the other hand, in case of PES, the mechanical strength was slightly reduced and the waterpermeability was increased. It was confirmed that the optimum mixing ratio of the PSf and PES with high water permeabilityand mechanical strength was 9:1.
Ceramic membranes are generally used for various industrial processes operating under extreme conditions becauseof its high thermal and chemical stability. However, due to the trade-off phenomenon of permeability and mechanicalstrength, preparation of high permeability-high strength membrane is necessary. In this study, the change in characteristicsand performances of ceramic membranes was analyzed depending on the type of polymer binder and its mixing ratio. Because the solubility between solvent and polymer binder was higher in PSf (polysulfone) than in PES (polyethersulfone),the viscosity and discharge pressure of the PSf-based dope solution were higher than those of PES-based dope solution. When PSf was used as a polymer binder, ceramic membrane showed high mechanical strength and low water permeabilitydue to the dense structure. On the other hand, in case of PES, the mechanical strength was slightly reduced and the waterpermeability was increased. It was confirmed that the optimum mixing ratio of the PSf and PES with high water permeabilityand mechanical strength was 9:1.