본 연구에서는 페나진(phenazine) 구조를 갖는 고분자인 PIM-7을 합성하고, 그 특성과 전기화학적 거동을 평가하 여 CO2 포집을 위한 산화·환원 활성 고분자 플랫폼으로서의 가능성을 검토하였다. 합성 과정에서는 5,5',6,6'-tetrahydroxy- 3,3,3',3'-tetramethyl-1,1'-spirobisindane의 케톤화 유도체(TTSBI-ketone)를 아세톤 재결정으로 정제하여 순도를 향상시 켰으며, 이를 통해 단계성장 중합이 안정적으로 진행되었다. 최종 고분자의 구조는 FT-IR 및 NMR 분석을 통해 확인하였다. 질소 흡착 분석 결과, PIM-7은 약 519 m2/g의 높은 BET 비표면적을 보여 기체 접근성이 좋은 미세다공성 골격을 형성하고 있음을 알 수 있었다. 또한 cyclic voltammetry 측정에서는 CO2가 존재할 때 PIM-7 복합 필름의 환원 전류가 선택적으로 증 가하는 현상이 관찰되었으며, 이는 환원된 페나진 중심과 CO2 사이의 상호작용에 따른 것으로 해석된다. 이러한 CO2 반응성 은 여러 주사 속도와 반복 측정 조건에서도 일관되게 유지되었고, 이는 해당 산화·환원-CO2 상호작용이 단순 표면 현상이 아 니라 고분자 자체의 고유한 특성임을 보여준다. 이와 같은 결과는 PIM-7이 고체 상태에서 전기적으로 제어 가능하며, 미세다 공성을 갖춘 산화·환원 기반 CO2 포집 소재로 활용될 수 있음을 제시한다.

This study aimed to develop a powderization strategy using porcine by-products (kidney, liver, and heart) by evaluating the effects of raw material type, pretreatment, and additives (hydroxypropyl methyl cellulose P645 and gelatin) on powder characteristics. Powders from kidney tissue were analyzed for yield, particle structure, compressibility, and size distribution, based on the drying method and additive composition. The spray-dried sample with gelatin at 1:0.5 (w/w) showed 20.4% compressibility and the smallest, most uniform particles, indicating excellent flowability. Due to its superior structural stability, gelatin was selected over HPMC P645. Liver and heart samples that underwent enzymatic hydrolysis and the Maillard reaction were spray-dried with gelatin and assessed for yield and microstructure. The Alcalase-treated liver sample showed the highest yield. Surface analysis confirmed that gelatin formed a protective film enhancing particle stability. These findings suggest gelatin-based spray drying is effective for producing high-quality powders from protein-rich by-products.

Polymeric materials are extensively utilized in various industrial applications, including as gas barriers, fuel cells, sensors, and in semiconductor processes, and are particularly critical to ensure sealing performance in high-pressure gas systems. The diffusivity and solubility of gases within polymers significantly influences their sealing efficacy and is closely related not only to polymer–gas interactions but also to the thermodynamic properties of the gases. Notably, gas solubility exhibits a quantitative correlation with critical temperature, attributed to the condensability of the gas molecules. In this study, the solubility of five pure gases (H2, He, N2, O2, Ar) with varying critical temperatures was quantitatively measured and analyzed under high-pressure conditions (1-10 MPa) in four polymers differing in structure and density. The experiments employed both volumetric and manometric methods to measure gas desorption concentration, with meticulous corrections for minor temperature and atmospheric pressure variations to ensure data accuracy. The results demonstrated that the logarithmic solubility of gases in polymers increases linearly with the gas critical temperature, consistent across all polymer samples. This finding aligns with predictions from the Non-Equilibrium Lattice Fluid (NE-LF) model, which has been shown to accurately describe gas solubility behavior in glassy polymers.