An approach to mimic nature by self-healing - a boon to achieve material durability / Trisha Kaushik in PAINTINDIA, Vol. LXXII, N° 9 (09/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 9 (09/2022) . - p. 53-86 Titre : An approach to mimic nature by self-healing - a boon to achieve material durability Type de document : texte imprimé Auteurs : Trisha Kaushik, Auteur ; Shubhajit Paul, Auteur Année de publication : 2022 Article en page(s) : p. 53-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Effet mémoire de forme Electrohydrodynamique Encapsulation Enrobage (technologie) Fibres creuses Ionomères Un ionomère est un copolymère thermoplastique « réticulé ioniquement ». La réticulation améliore la cohésion du polymère et la conductivité électrique. Matériaux autoréparants Nanoparticules Particules (matières) -- Migration Polymères supramoléculaires Les polymères supramoléculaires sont des longues chaînes linéaires formées par assemblage réversible de composés de faible masse molaire. La réversibilité de l'association confère à ces matériaux des propriétés proches, mais complémentaires de celles des polymères classiques. En effet, dans les conditions d'utilisation, un polymère supra-moléculaire est en équilibre avec son monomère. Par conséquent, en modifiant légèrement les conditions expérimentales (solvant, concentration, température, cisaillement...), il est possible d'allonger ou de raccourcir les chaînes supramoléculaires et donc de changer les propriétés (rhéologiques, mécaniques...) du système. Cette particularité constitue un avantage pour de nombreuses applications potentielles, ainsi qu'une difficulté de caractérisation. Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : We have known that coatings principally are meant to deliver corrosion protection and aesthetics. A few polymeric materials used as coating go through many structural and physical changes, as cracks occur due to physical damage or environmental effect on ageing. These cracks may propagate and can potentially cause over all destruction of the coating as well as the target material itself. This has created a demand for automatic healing as a concept. This concept is mimicking the idea of natural power of self- healing observed in human skins. This process is nothing but incorporating some encapsulated healing materials which will be released in a controlled way to prevent crack propagation when a crack initiates. The encapsulation of active healing agents includes embedment of healing agent containing microcapsules or hollow fibres. There are also some reversible processes like Diels-Alder reaction, ionomers and supramolecular system which provide the self healing mechanism. In this paper, different kinds of self healing mechanism of coating like catalyst free self healing induced by sunlight, shape memory effect, electro-hydrodynamics, nano particle migration, co-deposition etc are also reviewed. Advantages as well as drawbacks have been described for those type of mechanism to achieve self healing property. Characterization and quantification techniques are also described in this review. Application of self healing coating in different sectors has been described and the acceptance of th is new generation coating by global market is also captured in this article. Note de contenu : - SELF-HEALING TECHNIQUES : Classification of self healing material - Methodologies for achieving self-healing functionality - Microcapsule embedment - Hollow fibre embedment - Microvascular system - Reversible cross links - Supramolecular polymers - Ionomers - Miscellaneous techniques - Nanoparticle migration - Co-deposition - Phase separation method - Quantification of healing - Challenges of the self healing coatings - Application of self healing coating - Global market scenario - Prospect evaluation - Table 1 : Different self healing systems via microencapsulation technique - Table 2 : Different works on hollow fibre embedment En ligne : https://drive.google.com/file/d/19nUZQrmPzBy4jgzGARVFfNhDyCSODElp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38508 [article]

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Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation / Hongbin Li in COLORATION TECHNOLOGY, Vol. 135, N° 6 (12/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 6 (12/2019) . - p. 451-466 Titre : Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation Type de document : texte imprimé Auteurs : Hongbin Li, Auteur ; Xiangwei Feng, Auteur ; Wenying Shi, Auteur ; Zhang Haixia, Auteur ; Qiyun Du, Auteur ; Longwei Qin, Auteur ; Xiaohong Qin, Auteur Année de publication : 2019 Article en page(s) : p. 451-466 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Caractérisation Colorants Colorants -- Elimination Déchets industriels -- Elimination Eaux usées -- Epuration Fibres creuses Hydrophobie Membranes (technologie) Polyfluorure de vinylidène Index. décimale : 668.5 Parfums et cosmétiques Résumé : Hydrophobic polyvinylidene fluoride (PVDF) hollow fibre composite membranes were prepared by the dilute solution coating process to build a special surface structure that was similar to the dual micro‐nano structure on the lotus leaf. Poly(vinylidene fluoride‐co‐hexafluoropropene) was chosen as the hydrophobic polymer candidate in dilute solution. Membrane morphology and surface hydrophobicity were evaluated by scanning electron microscopy and dynamic water contact angle measurement. The prepared PVDF hollow fibre membranes were employed to separate dyes (Congo Red and Methylene Blue) from water by vacuum membrane distillation. The effects of operational conditions (feed temperature, vacuum pressure and feed flow rate) on the vacuum membrane distillation performance of different PVDF membranes were investigated. The results indicated that the water contact angle values of PVDF composite membrane surfaces improved from 93.6° to 130.8°, which was mainly attributed to the formation of micro‐nano rods. This structure was similar to the dual micro‐nano structure on the lotus leaf. Under test feed temperature, vacuum pressure and feed flow rate conditions, the dye rejection rate of Congo Red and Methylene Blue by the hydrophobic PVDF hollow fibre membrane remained above 99.5% and 99%, which was higher than that of the pristine PVDF membrane (99% and 98%, respectively). In addition, the hydrophobic PVDF hollow fibre composite membrane showed higher permeation flux under different conditions compared with the pristine PVDF membrane, which was attributed to membrane surface hydrophobicity and the electrostatic interactions between dyes and the PVDF membrane surface. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the single PVDF hollow fibre membrane - Preparation of the composite PVDF hollow fibre membrane - Characterisation of the PVDF hollow fibre membrane - VMD experiments - Membrane anti-fouling experiments - RESULTS AND DISCUSSION : Morphology of different PVDF hollow fibre membranes - performance parameters of different PVDF membranes - Hydrophobicity of the membrane surface - Performance characterisation of hollow fibre membranes in VMD for dye removal - Effects of feed temperature on VMD performance - Effects of vacuum pressure on VMD performance - Effects of feed flow rate on VMD performance - Fouling behaviour of hollow fibre membranes in VME for dye removal DOI : 10.1111/cote.12436 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12436 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33377 [article]

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Effect of spin-draw rate and stretching ratio on polypropylene hollow fiber membrane made by melt-spinning and stretching method / F.-J. Wei in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 1 (03/2018) . - p. 13-19 Titre : Effect of spin-draw rate and stretching ratio on polypropylene hollow fiber membrane made by melt-spinning and stretching method Type de document : texte imprimé Auteurs : F.-J. Wei, Auteur ; H.-J. Shao, Auteur ; Bin Wu ; K.-Z. Zhang ; D.-J. Luo ; S.-H. Qin ; Z. Hao ; H.-J. Shao Année de publication : 2018 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Diffusion aux petits angles Extrusion filage Fibres creuses Membranes (technologie) Microscopie électronique à balayage Perméabilité Polypropylène Porosité Procédés de fabrication Index. décimale : 668.4 Plastiques, vinyles Résumé : A series of polypropylene hollow fiber membranes was fabricated by melt-spinning and stretching. The crystalline behavior and hard elasticity of precursor hollow fibers were studied by differential scanning calorimetry (DSC), elastic recovery and strain-stress curves. The structure and properties of membranes were investigated in detail by scanning electron microscopy (SEM), optical microscopy, pure water flux, and so on. The results showed that membranes with excellent structure and properties can be obtained at a spin-draw rate of 350 m/min and a stretching ratio of 200 %. The evolution of crystal structure was explored during the annealing and stretching processes by two-dimensional small-angle X-ray scattering (2D-SAXS). Shish-kebab structure was obtained during annealing for hollow fibers at a spin-draw rate of 350 m/min. The crystalline lamellae were destroyed and micropores were formed during the fabrication of membranes by stretching. Note de contenu : - MATERIALS : Materials - Samples Preparation - Differential scanning calorimetry - Hard elasticity - Scanning electron microscopy - Optical microscopy - Mean pore size porosity - Pure water permeability - Two-dimensional small-angle x-ray scattering - RESULTS AND DISCUSSION : Effect of spin-draw rate on properties of polypropylene hollow fiber and membrane - Effect of stretching ratio on structure and properties of membranes - SAXS analysis DOI : 10.3139/217.3303 En ligne : https://drive.google.com/file/d/1abCYpLJTnLTRmCTM2mbZVQWFMnlpBStS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30154 [article]

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Effects of cooling ways on the structure of polypropylene hollow fiber membranes prepared by stretching / D.-J. Luo in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 172-181 Titre : Effects of cooling ways on the structure of polypropylene hollow fiber membranes prepared by stretching Type de document : texte imprimé Auteurs : D.-J. Luo, Auteur ; F.-J. Wei, Auteur ; H.-J. Shao, Auteur ; K.-Z. Zhang, Auteur ; Z.-Y. Cui, Auteur ; J. Yu, Auteur ; S.-H. Qin, Auteur Année de publication : 2019 Article en page(s) : p. 172-181 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Essais dynamiques Extrusion filage Fibres creuses Membranes (technologie) Morphologie (matériaux) Polypropylène Porosité Surfaces (Physique) Systèmes de refroidissement Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Air, water, and DINCH (Di-isononyl-cyclohexane-1,2-dicarboxylate) were selected as the cooling media to prepare polypropylene hollow fiber membranes by melt spinning. The effects of various cooling ways with different cooling rates on the row-nucleated lamellar crystallization were investigated. The crystallinity, orientation and arrangement of the crystals were examined by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Membrane morphology was observed by SEM. The less uniform pores, a layer of amorphous phase, and only a small part of slit-shaped pores were observed on the surface of samples when water and DINCH were used as the heat transfer medium because the fast cooling rate froze the surface molecules and decreased the crystallinity and orientation. However, when air was used as the cooling medium, the higher crystallinity and the better orientation of the annealed hollow fibers were obtained mainly due to the slow cooling rate. Corresponding hollow fiber membranes prepared by stretching had better interconnectivity of pores and larger pure water flux. Thus this study explains why air was selected as the cooling medium to prepare polypropylene hollow fiber membranes which can have larger pure water flux. Also, it provides new insights into the structure control of polypropylene hollow fiber membranes by stretching in order to prepare membranes with high strength. Note de contenu : - EXPERIMENTAL : Materials - Membrane preparation - Differential Scanning Calorimetry - Surface morphology - Tensile properties - Elastic recovery rate - RESULTS AND DISCUSSION : Crystallization and DSC analysis - SAXS and WAXD analysis - Tensile properties and elastic recovery rate - Surfaces morphologies - Porosity and pure water flux DOI : 10.3139/217.3638 En ligne : https://drive.google.com/file/d/1T1rC3UNtaRnspchVpMtyqp5EaKrJkRWH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32393 [article]

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Efficient separation in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 7 (07/2012)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 102, N° 7 (07/2012) . - p. 53 Titre : Efficient separation Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 53 Langues : Anglais (eng) Catégories : Fibres creuses Gaz -- Séparation Membranes (technologie) Polyimides Polymères hautes performances Séparation (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Polyimide - New, highly selective polymer membranes from polyimide fibers provide a simple and efficient way to convert raw biogas into highly pure biomethane. Being very resistant to pressure and temperature impact too, these high-performance fibers are particularly suited for this high-pressure process. Note de contenu : - Biogas upgrading - Highly selective membranes Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15603 [article]

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Lightweight polyester fibers / Ömer Cetin in CHEMICAL FIBERS INTERNATIONAL, Vol. 64, N° 4 (12/2014)  

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Moisture absorption and liberation behavior of novel hollow viscose fiber / Yue Mao in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 3 (10/2016)  

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Moisture absorption and liberation behavior of novel hollow viscose fiber / Yue Mao in CHEMICAL FIBERS INTERNATIONAL, (10/2017)  

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New approach for the production meltspun microporous hollow fibers / Philipp Schuster in CHEMICAL FIBERS INTERNATIONAL, Vol. 63, N° 1 (03/2013)  

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One-dimensional structured fillers as novel carriers for self-healing coatings : a comprehensive review / Hanhai Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

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Preparation of carboxylated graphene oxide nanosheets/polysulphone hollow fibre separation membranes with improved separation and dye adsorption properties / Wenying Shi in COLORATION TECHNOLOGY, Vol. 135, N° 5 (10/2019)  

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Recyclage. Les promesses des membranes / Benoît Crépin in INDUSTRIE & TECHNOLOGIES, N° 1013 (10/2018)

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Scented hollow fibers in CHEMICAL FIBERS INTERNATIONAL, Vol. 70, N° 1 (03/2020)  

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Scented hollow fibers in CHEMICAL FIBERS INTERNATIONAL, Vol. 70, N° 4 (12/2020)  

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Structure and properties of novel hollow viscose fiber / Yue Mao in CHEMICAL FIBERS INTERNATIONAL, (09/2016)  

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Study on melt spinning of shaped hollow polypropylene fibers / C. Prahsarn in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)  

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