【摘 要】
：
Membranes from block copolymer poly (amide-12-b-ethylene oxide) (Pebax1074) and its blends with dif-ferent molecular weight poly (ethylene glycol) (PEG) (20 0, 40 0, 60 0, 150 0, 4600 and 8000) were pre-pared. The thermal properties and structures of Peba
【机 构】
：
State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy o
论文部分内容阅读
Membranes from block copolymer poly (amide-12-b-ethylene oxide) (Pebax1074) and its blends with dif-ferent molecular weight poly (ethylene glycol) (PEG) (20 0, 40 0, 60 0, 150 0, 4600 and 8000) were pre-pared. The thermal properties and structures of Pebax1074/PEG blend membranes were characterized by DSC and SEM, and the gas permeation properties of CO2 and N2 were also investigated at different temperatures. For Pebax1074/PEG blend membranes with low molecular weight PEG ( MW ≤600), higher gas permeabilities than Pebax1074 were achieved. The permeability increased with the increase of PEG molecular weight. The addition of low molecular weight PEG resulted in decrease in activation energy of permeation. For Pebax1074/PEG blend membranes with high molecular weight PEG ( MW ≥1500), due to the melt of PEO phase crystals, the gas permeation properties of blend membranes were temperature-dependent, which could be divided into crystalline region, transition region and amorphous region ac-cording to two different transition temperatures. PEG molecular weight and operation temperature de-termined different gas permeation properties of Pebax1074/PEG blend membranes in three regions. The activation energies of permeation in crystalline region were larger than those in amorphous region.
其他文献
Fabricating of high performance electrodes by a sustainable and cost effective method is essential to the development of vanadium redox flow batteries (VRFBs).In this work,an effective strategy is proposed to deposit carbon nanoparticles on graphite felts
We used a chemical reduction method to synthesize the catalysts of cobalt (Co) and cobalt-ruthenium (Co-Ru) bifunctional supported on carbon nanotubes (CNTs) for Fischer–Tropsch synthesis (FTS) in a fixed-bed reactor. These Co-Ru/CNTs catalysts were synth
Methylcyclopentenyl cations (MCP+) have been regarded as active intermediates during methanol conversion,however,their function mode in the reaction are still uncertain.In our recent report,trimethylcyclopentenyl cation (triMCP+) and its deprotonated coun
Aromatics are important basic chemicals.However,direct conversion of syngas via the conventional Fischer-Tropsch synthesis produces little aromatics.We presented herein that a bifunctional composite of ZSM-5 in combination with ZnCrOx catalyzes syngas con
Development of efficient molecular devices for overall water splitting has always been a hotspot of research to realize clean and sustainable energy conversion.In the case,long-term durability of molecular devices is a crucial factor to determine their pr
The ternary amides LiK2(NH2)3,LiK(NH2)2,and Li3K(NH2)4 are successfully synthesized by ball milling mixtures of LiNH2 and KNH2,and the hydrogen storage properties of Li3K(NH2)4-xMgH2 (x =1,2,3,4) are systematically investigated.The Li3K(NH2)4-2MgH2 sample
CO2 hydrogenation to methanol on small size Pdx clusters (x=7,9 and 13) has been studied using density functional theory calculations.It has been found that in contrast to metallic Pd system,these small Pdx clusters can interact well with CO2 molecule.CO2
Although there have been many reports of metal doping to ameliorate the drawbacks of hematite as the photoanode for water oxidation,most of them focused on monometallic doping,and only a few of them payed attention to bimetallic doping.What is worse,the s
A phosphorous-doped graphite felt (PGF) is fabricated and examined as electrode for vanadium flow battery (VFB).P doping improves the electrolyte wettability of GF and induces more defect sites on its surface,resulting in significantly enhanced activity a
Understanding carbon-supported Pt-catalyzed oxygen reduction reaction (ORR) from the perspective of the active sites is of fundamental and practical importance.In this study,three differently sized carbon nanotube-supported Pt nanoparticles (Pt/CNT) are p