Aliphatic chain grafted polypyrrole as a precursor of carbon membrane

Chen, Xinwei; Hong, Liang; Chen, Xinling; Yeong, Wen Hao Au; Chan, Wan Ki Isabel

doi:10.1016/j.memsci.2011.06.007

Cited by 27 publications

(13 citation statements)

References 27 publications

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“…On top, the bare PS‐ b ‐P4VP membrane reveals the pyridine signal at 399.3 eV 26. After deposition of PDA the pyrollic peak of polydopamine became visible at 399.7 eV,27 in comparison to the spectrum in Figure 9b. Since the film thickness is very low (below ca.…”

Section: Resultsmentioning

confidence: 88%

Double Stimuli‐Responsive Isoporous Membranes via Post‐Modification of pH‐Sensitive Self‐Assembled Diblock Copolymer Membranes

Clodt

Filiz

Rangou

et al. 2012

Adv Funct Materials

197

174

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Double stimuli‐responsive membranes are prepared by modification of pH‐sensitive integral asymmetric polystyrene‐b‐poly(4‐vinylpyridine) (PS‐b‐P4VP) diblock copolymer membranes with temperature‐responsive poly(N‐isopropylacrylamide) (pNIPAM) by a surface linking reaction. PS‐b‐P4VP membranes are first functionalized with a mild mussel‐inspired polydopamine coating and then reacted via Michael addition with an amine‐terminated pNIPAM‐NH2 under slightly basic conditions. The membranes are thoroughly characterized by nuclear magnetic resonance (1H‐NMR), Fourier transform infrared spectroscopy and X‐ray‐induced photoelectron spectroscopy. Additionally dynamic contact angle measurements are performed comparing the sinking rate of water droplets at different temperatures. The pH‐ and thermo‐double sensitivities of the modified membranes are proven by determining the water flux under different temperature and pH conditions.

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Section: Resultsmentioning

confidence: 88%

Double Stimuli‐Responsive Isoporous Membranes via Post‐Modification of pH‐Sensitive Self‐Assembled Diblock Copolymer Membranes

Clodt

Filiz

Rangou

et al. 2012

Adv Funct Materials

197

174

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“…A decrease of solubility is thus observed. Moreover, if the polymer is hydrophobic, molecules of water interact together preferentially, resulting in the formation of clusters [7][8]. Clustering can result either in an increase of the permeability due to swelling and free volume increase or in a decrease due to pore filling and blocking.…”

Section: Introductionmentioning

confidence: 99%

Humidity Impact on the Gas Permeability of PIM-1 Membrane for Post-combustion Application

2014

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The impact of humidity on PIM1 membrane performance, i.e. CO 2 permeability and CO 2 /N 2 selectivity, is investigated in this study. While most novel materials are tested in dry conditions, flue gas contains a significant amount of water that could affect dramatically the membranes and the productivity of the separation process. In this work, mixed gas permeability was measured by a flow method measurement with humidity and CO 2 sensor. Three different concentrations of CO 2 are studied, pure CO 2 , and mixtures close to coal-fired and gas-fired power plants. Increasing water activity in the feed stream induces a decrease in the permeability of both CO 2 and N 2 . This behavior is related to the competitive sorption between water and CO 2 , and to the formation of water clusters which hindered the transport of others gas species. The same behavior is observed also for aged membranes.

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“…The nanoporosity of the polymer arises from the swelling of the polymer when the fragrance interacts with the polymer chain. Therefore, traditional methods using gas (particularly, nitrogen) adsorption, mercury intrusion, or microscopic imaging cannot be applied because of the small pore range (<1 nm) of the PUA matrix before swelling. Moreover, these techniques cannot be applied to the swollen polymer matrix.…”

Section: Resultsmentioning

confidence: 99%

Designing nanoporosity in a swollen polymer for the controlled release of a highly volatile fragrance

Chen

Bhardwaj

Sharifah

et al. 2018

Flavour & Fragrance J

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Controlling the fragrance release profile, especially the highly volatile top note, can prolong the desired scent of the fragrance. Here, the porosity of a swollen cross‐linked polyurethane acrylate (PUA) polymer, which is tuned by the length of a modulator, can influence the evaporation rate of the top note. In particular, the evaporation rate of benzyl acetate (BA), a common top note, is reduced by a factor of 6.5 (from 134 to 17 mg m–2 min–1) when BA is released from the best‐performing PUA against a reservoir of BA. The average diameter of an opening in the fragrance‐loaded PUA is ~6 nm, as determined by the thermoporosimetry approach. Such a pore size can effectively control the evaporation rate of BA, as predicted by the theoretical model, which reveals that a pore diameter of <16 nm is required. Computational modelling reveals the optimal chain length for a modulator used for the sustained released of fragrance, confirming the experimental data. Finally, BA continues to be released from the PUA matrix for a prolonged period, even after 3 months, whereas the same quantity of BA would completely evaporate after 1 week in the absence of PUA matrix. Approximately 50wt% of BA remains after 60 days, making it one of the best techniques in sustaining the release of a top note.

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Aliphatic chain grafted polypyrrole as a precursor of carbon membrane

Cited by 27 publications

References 27 publications

Double Stimuli‐Responsive Isoporous Membranes via Post‐Modification of pH‐Sensitive Self‐Assembled Diblock Copolymer Membranes

Double Stimuli‐Responsive Isoporous Membranes via Post‐Modification of pH‐Sensitive Self‐Assembled Diblock Copolymer Membranes

Humidity Impact on the Gas Permeability of PIM-1 Membrane for Post-combustion Application

Designing nanoporosity in a swollen polymer for the controlled release of a highly volatile fragrance

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