Preparation of microporous poly(vinylidene fluoride) membranes via phase inversion in supercritical CO2

Huang, Shirong; Wang, Guozhong; Chen, Shimou

doi:10.1016/j.memsci.2007.02.001

Cited by 45 publications

(10 citation statements)

References 43 publications

(162 reference statements)

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“…The difference observed in the DSC data have been observed in other studies reporting the use of supercritical fluid technology in the preparation of PVDF membranes [31]. Supercritical assisted phase inversion enhanced the crystallization development of the polymer, which is evident in the DSC trace.…”

Section: Water Uptake and Degradation Studiessupporting

confidence: 57%

Enzymatic degradation of 3D scaffolds of starch-poly-(ɛ-caprolactone) prepared by supercritical fluid technology

Duarte

Mano

Reis

2010

Polymer Degradation and Stability

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Starch-based polymers have been proposed for different tissue engineering applications due to their inherent properties. In this work, a polymeric blend of starch-poly-(3-caprolactone) (SPCL) was processed using supercritical fluid technology, namely, by supercritical assisted phase inversion. As SPCL is a biodegradable polymer, the matrices produced are susceptible of undergoing enzymatic degradation upon implantation in the human body. In vitro assessment of the enzymatic degradation of SPCL was carried out in different buffer solutions containing a-amylase and/or lipase. The effect of the presence of these enzymes was studied by monitoring different parameters in order to characterise both bulk and the surface of the scaffolds. As regards to bulk analysis, weight loss of the samples incubated for 1, 3, 7, 14 and 21 days was determined, further differential scanning calorimetry was carried out. The morphology of the scaffolds after these periods was analysed by micro-computed tomography (m-CT) and surface chemistry was characterised by infra-red spectroscopy and contact angle measurements. Results suggest that SPLC scaffolds undergo bulk degradation, which is typically characterised by hydrolysis of chemical bonds in the polymer chain at the centre of the matrix, resulting in a highly porous material.

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Section: Water Uptake and Degradation Studiessupporting

confidence: 57%

Enzymatic degradation of 3D scaffolds of starch-poly-(ɛ-caprolactone) prepared by supercritical fluid technology

Duarte

Mano

Reis

2010

Polymer Degradation and Stability

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“…Several approaches to improve the conductivity of PBI membranes including creating porous membranes using wet phase inversion technique were proposed . An alternative way to obtain the porous structure is to induce phase separation using a supercritical fluid, for example CO 2 , as a nonsolvent for the polymer . As compared to the wet phase inversion method this approach has the following advantages: no residual solvent problem due to easy CO 2 removal upon decompression; high diffusivity of the supercritical nonsolvent decreases the process time; the possibility to control membrane morphology by means of changing pressure and decompression rate; CO 2 is a green solvent, which may be recycled with ease by a simple decompression‐compression procedure. …”

Section: Introductionmentioning

confidence: 99%

Ion transport properties of porous polybenzimidazole membranes for vanadium redox flow batteries obtained via supercritical drying of swollen polymer films

Sizov

Kondratenko

2018

J of Applied Polymer Sci

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A novel method of membrane preparation for use in vanadium redox flow batteries by preswelling of poly(2,5-benzimidazole) films in organic solvent followed by supercritical CO 2 assisted solvent removal is proposed. Influence of the organic solvent type on the morphology, proton, and vanadyl ion transport properties is studied. The performance of the obtained membranes inside single cells of vanadium redox flow batteries is compared to pristine dense poly(2,5-benzimidazole) and Nafion 115 membranes.

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“…Generally, PVDF membranes are usually prepared through thermally-induced phase separation [9] or immersion precipitation [10], but other methods are also developed to prepare PVDF membranes such as sintering [11], track etching [12] and phase separation using supercritical carbon dioxide as non-solvent [13], etc. Although, PVDF membranes have already been widely used in many fields, the high hydrophobicity characteristic of PVDF membranes also limits the enlarging of application fields.…”

Section: Introductionmentioning

confidence: 99%

Hydrophilicity, morphology and excellent adsorption ability of poly(vinylidene fluoride) membranes induced by graphene oxide and polyvinylpyrrolidone

Liu

Duan

Yang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Preparation of microporous poly(vinylidene fluoride) membranes via phase inversion in supercritical CO2

Cited by 45 publications

References 43 publications

Enzymatic degradation of 3D scaffolds of starch-poly-(ɛ-caprolactone) prepared by supercritical fluid technology

Enzymatic degradation of 3D scaffolds of starch-poly-(ɛ-caprolactone) prepared by supercritical fluid technology

Ion transport properties of porous polybenzimidazole membranes for vanadium redox flow batteries obtained via supercritical drying of swollen polymer films

Hydrophilicity, morphology and excellent adsorption ability of poly(vinylidene fluoride) membranes induced by graphene oxide and polyvinylpyrrolidone

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