Accueil
Détail de l'auteur
Auteur S.-H. Qin |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
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]
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 fabricationIndex. 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 analysisDOI : 10.3139/217.3303 En ligne : https://drive.google.com/file/d/1abCYpLJTnLTRmCTM2mbZVQWFMnlpBStS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30154
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 1 (03/2018) . - p. 13-19[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 19659 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 fluxDOI : 10.3139/217.3638 En ligne : https://drive.google.com/file/d/1T1rC3UNtaRnspchVpMtyqp5EaKrJkRWH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32393
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 172-181[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20883 - Périodique Bibliothèque principale Documentaires Disponible Morphology and isothermal crystallization kinetics of polypropylene/poly(ethylene-co-vinyl alcohol) blends / D.-J. Luo in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)
[article]
Titre : Morphology and isothermal crystallization kinetics of polypropylene/poly(ethylene-co-vinyl alcohol) blends Type de document : texte imprimé Auteurs : D.-J. Luo, Auteur ; H.-J. Shao, Auteur ; F.-J. Wei, 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. 195-208 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Caoutchouc
Copolymère éthylène alcool de vinyleC'est aujourd'hui le matériau le plus utilisé dans l'emballage rigide alimentaire. Il peut être utilisé avec des matériaux de structure comme le polyéthylène, polypropylène ou polystyrène. Ce copolymère présente une excellente imperméabilité à l'oxygène, au gaz carbonique et aux arômes, à condition de protéger de l'influence de l'humidité qui fait chuter fortement ses performances. Pour palier cet inconvénient, il est souvent pris en sandwich dans des structures multicouches à base de polyoléfines PE ou PP peu sensibles à l'humidité. Il est utilisé pour les emballages de compotes, jus de fruits, fromages, sauces, crèmes et yaourts, mayonnaise, sauce tomate...
Cristallisation
Diffractométrie de rayons X
PolypropylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polypropylene (PP)/poly(ethylene-co-vinyl alcohol) (EVOH) blends were prepared by melt blending using PP-g-MAH as a compatabilizer. The microstructure and rheological behavior of PP/EVOH blends were studied. The results showed the that EVOH particles were uniformly dispersed in the PP matrix and inhibited the mobility of PP chains. The isothermal crystallization kinetics and morphology development of PP/EVOH blends were compared with that of pure PP. It was found that the EVOH essentially acted as an effective nucleating agent for PP, which could significantly increase the nucleation rate because the EVOH molecules in PP/EVOH blends aggregated together to form interface. Therefore, the introduction of EVOH increased the overall rate of isothermal crystallization compared with pure PP, although the PP molecular chains would be hindered seriously if excessive amounts of EVOH were added. X-ray diffraction showed that pure PP and PP/EVOH blends exhibited an identical crystal structure, and the crystallinity of the PP phase in the blends was not significantly different from that of pure PP. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Characterization
- RESULTS AND DISCUSSION : Microstructural and viscoelastic properties of PP/EVOH blends - Non-isothermal crystallization behavior of PP/EVOH blends - Isothermal crystallization kinetics of PP/EVOH blends - Melting behavior of isothermally crystallized PP/EVOH blends - Morphology and microstructure of PP/EVOH blendsDOI : 10.3139/217.3589 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3589/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32395
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 195-208[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20883 - Périodique Bibliothèque principale Documentaires Disponible Synergistic flame-retardant effect of aluminum diethyl phosphinate in PP/IFR system and the flame-retardant mechanism / J.-L. Li in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 5 (2021)
[article]
Titre : Synergistic flame-retardant effect of aluminum diethyl phosphinate in PP/IFR system and the flame-retardant mechanism Type de document : texte imprimé Auteurs : J.-L. Li, Auteur ; C.-T. Gao, Auteur ; X. Sun, Auteur ; S.-G. Peng, Auteur ; Y.-W. Wang, Auteur ; S.-H. Qin, Auteur Année de publication : 2021 Article en page(s) : p. 519-528 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Carbonisation
Chimie analytique
Combustion
Diéthylphosphinate d'aluminium
Formulation (Génie chimique)
Intumescence (chimie)
Polymères ignifuges
Polypropylène
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.Index. décimale : 668.4 Plastiques, vinyles Résumé : Synergistic flame-retardant effect of aluminum diethyl phosphinate (AlPi) in intumescent flame retardant polypropylene (PP/IFR) system and the flame-retardant mechanism were investigated. The flame retardancy of PP/IFR/AlPi (the mass ratio of IFR to AlPi is 2 : 1) was the best, which was proved by the results of the limiting oxygen index (LOI) test, UL-94 test, and cone calorimeter test ( CCT) test. Here, the LOI value of the sample was as high as 34% and passed the V–0 rating in UL–94 test. The peak heat release rate (PHRR) decreased by 92.57%, the total heat release (THR) reduced by 90.52%. Thermogravimetric (TGA) data showed that the introduction of AlPi improved thermal stability and changed the thermal degradation behavior of PP/IFR composites. Interestingly, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS) and laser Raman spectroscopy (LRS) proved that PP/IFR/AlPi had formed more residual carbon, but the flame retardancy was worse than PP/IFR/AlPi. This is because when the mass ratio of IFR to AlPi is 2 : 1, the synergy between IFR and AlPi was significant, gas-phase flame retardant and condensed-phase flame retardant reached a balance and obtained the best flame retardant effect. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PP/IFR/AlPi composites - Characterization
- RESULTS AND DISCUSSION : Flame retardancy of PP/IFR/AlPi composites - Combustion behavior of PP/IFR/AlPi composites - Thermal degradation behavior of PP/IFR/AlPi composites - Residual carbon morphology of PP/IFR/AlPi composites - Chemical composition of residual carbon in PP/IFR/AlPi composites
- POSSIBLE FLAME-RETARDANT MECHANISM DISCUSSION
- Table 1 : Formulations of PP/IFR/AlPi composites
- Table 2 : Results of the LOI and UL-94 tests for PP, PP/IFR/AlPi, PP/IFR, PP/AlPi composites
- Table 3 : CCT results of PP, PP/IFR/AlPi, PP/IFR, PP/AlPi composites
- Table 4 : TGA and DTG data for PP, PP/IFR/AlPi, PP/IFR, PP/AlPi composites
- Table 5 : Chemical composition of the residue chars for PP, PP/IFR/AlPi, PP/IFR and PP/AlPi compositesDOI : https://doi.org/10.1515/ipp-2020-4082 En ligne : https://drive.google.com/file/d/1OfUxCdiYtuNX7vTx3Q9KvyYy0W2T1KXk/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36519
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 5 (2021) . - p. 519-528[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23735 - Périodique Bibliothèque principale Documentaires Disponible