Biomass-Derived Polymeric Membranes for Gas Separation : Isosorbide-Substituted Poly(Arylene Ether) Biopolymer Membranes
- 주제어 (키워드) Gas separation , Biopolymer , Polymeric membrane , Isosorbide substitution
- 발행기관 서강대학교 일반대학원
- 지도교수 이종석
- 발행년도 2024
- 학위수여년월 2024. 2
- 학위명 석사
- 학과 및 전공 일반대학원 화공생명공학과
- 실제URI http://www.dcollection.net/handler/sogang/000000077173
- UCI I804:11029-000000077173
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권 보호를 받습니다.
초록
Biopolymer membranes have been continually pursued to mitigate the carbon footprint and preserve the environment. This study introduces isosorbide (ISB)-substituted poly(arylene ether) biopolymer membranes, notably ISB-substituted poly(arylene ether sulfone) (I-PAES) and ISB-substituted poly(arylene ether ketone) (I-PAEK), tailored for gas separation. The remarkable mechanical properties and amorphous nature of ISB-substituted biopolymers render them suitable for gas separation applications. Through both positron annihilation lifetime spectroscopy (PALS) and group contribution analysis, it was found that substituting bisphenol A (BPA) in polysulfone (PSF) with ISB significantly reduces free volume due to the absence of bulky dimethyl groups and the presence of polar aliphatic ether groups. Substituting a carbonyl group for a sulfonyl group in PSF further diminishes free volume. In addition, analysis via solid-state 13C CP/MAS NMR revealed that ISB substitution and replacement from sulfonyl to carbonyl moieties restrict the rotational motion of internal rings within the structure, inhibiting gas diffusion. Consequently, the ISB-substituted polymeric membrane significantly enhances H2/CO2, and H2/CH4 selectivities compared to the PSF counterpart. This study demonstrates the feasibility of ISB-substituted PAE biopolymer membranes for gas separation application.
more목차
Chapter 1. Introduction 1
1.1 Background 2
1.2 Membrane Technology for Gas Separation 5
1.3 Polymeric Gas Separation Membrane 7
1.3.1 Sorption 8
1.3.1.1 Henry’s Sorption Model 10
1.3.1.2 Langmuir’s Sorption Model 12
1.3.1.3 Dual-Mode Sorption Model 15
1.3.2 Diffusion 17
1.3.3 Permeation through the Solution-Diffusion Mechanism 19
1.4 Challenges for Polymeric Gas Separation Membrane 21
1.4.1 Trade-off Relationship between Permeability and Selectivity 21
1.4.2 Environmental Issues in Materials for Gas Separation 23
1.5 Bio-Based Polymer for Gas Separation 25
Chapter 2. Materials and Experimental Methods 27
2.1 Introduction 28
2.2 Materials 30
2.3 Experimental Section 32
2.3.1 Preparation of Dense Polymeric Membrane 32
2.3.2 Gas Permeation Test 33
2.4 Characterizations 35
2.4.1 1H-Nuclear Magnetic Resonance (1H-NMR) 35
2.4.2 Fourier-Transform Infrared Spectroscopy (FT-IR) 36
2.4.3 Thermogravimetric Analysis (TGA) 37
2.4.4 Differential Scanning Calorimetry (DSC) 38
2.4.5 X-ray Diffraction (XRD) 39
2.4.6 Density Estimation for Calculation of Fractional Free Volume 40
2.4.7 Positron Annihilation Lifetime Spectroscopy (PALS) 41
2.4.8 Solid-State 13C Cross-Polarization Magic Angle Spinning (CP/MAS) Nuclear Magnetic Resonance (SS 13C NMR) 44
Chapter 3. Results and Discussions 45
3.1 Chemical Structure Characterization 46
3.2 Thermal Properties 48
3.3 Structural Analyses 58
3.3.1 Diffusion Region Estimations 58
3.3.2 Polymer Chain Motion Analysis 67
3.4 Gas Transport Properties 72
3.4.1 Single Gas Permeation Properties 72
3.4.2 Mixed Gas Permeation Properties 85
3.4.3 Comparison with Other Reported Polymeric Membrane Performance on Robeson Plot 88
Summary 99
Reference 111
