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Effect mechanism of acidification and vulcanization on SBS-modified asphalt / Feng Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 5 (2022)
[article]
Titre : Effect mechanism of acidification and vulcanization on SBS-modified asphalt Type de document : texte imprimé Auteurs : Feng Zhang, Auteur ; Lei Li, Auteur Année de publication : 2022 Article en page(s) : p. 559-567 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Asphalte
Caractérisation
Chromatographie sur gel
Copolymère styrène butadiène styrène
Matériaux -- Propriétés physiques
Matériaux bitumineux
Morphologie (matériaux)
Polyphosphorique, Acide
Rhéologie
Soufre
VieillissementIndex. décimale : 668.4 Plastiques, vinyles Résumé : A styrene-butadiene-styrene (SBS) modified asphalt compound was prepared by the addition of polyphosphoric acid (PPA) and sulfur. The effect of PPA and sulfur on major physical properties, including toughness and tenacity, aging resistance, and storage stability was investigated. The structural characteristics of SBS-modified (SM) asphalt, SBS/PPA-modified (SPM) asphalt, and SBS/PPA/sulfur-modified (SPSM) asphalt were investigated using scanning electron microscopy (SEM), gel filtration chromatography (GPC), and thermal analysis. It has been found that acidification prompted the clustering of SBS particles and confined the swelling of SBS, making SPM asphalt more susceptible to aging. Vulcanization changed the morphological characteristics of SBS in asphalt, improved the compatibility between SBS and asphalt, and weakened the aging susceptibility. Therefore, it is reasonable to modify SM asphalt by using PPA and sulfur together. Note de contenu : - MATERIALS AND METHODS : Materials - Sample preparation - Morphological characterization - Physical properties - Aging of asphalt - Rheological properties - GPC - Thermal analysis
- RESULTS AND DISCUSSION : Morphology - Physical properties - Rheological properties - GPC analysis - The experimental curve of a sam - Thermal analysis
- Table 1 : Physical properties of base asphalt
- Table 2 : Pore size and effective molecular weight range
- Table 3 : Physical properties of SM, SPM, SPSM asphalts
- Table 4 : Mn, Mw, Pd of SM, SPM, SPSM asphaltsDOI : https://doi.org/10.1515/ipp-2022-4233 En ligne : https://drive.google.com/file/d/1QUvhoIlOPwABi5t62ihU1YUuOzT-PmB-/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38330
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 5 (2022) . - p. 559-567[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23740 - Périodique Bibliothèque principale Documentaires Disponible Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings / Raj Shree in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
[article]
Titre : Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings Type de document : texte imprimé Auteurs : Raj Shree, Auteur ; R. Baloji Naik, Auteur ; Rupesh S. Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2021 Article en page(s) : p. 535–547 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Charbon, Cendres de
Composés organiques -- Synthèse
Epoxydes
Essais de comportement au feu
Fourier, Spectroscopie infrarouge à transformée de
Gommes et résines
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Phosphates
Polyphosphorique, Acide
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Transparent intumescent fire-retardant (IFR) coatings are the newest passive fireproofing materials which maintain structural integrity without losing aesthetic appearance of the substrate. In this present paper, effects of three IFR coatings with structurally different epoxy resins, namely aliphatic, cycloaliphatic, and aromatic, on the fire resistance, transparency, and physicomechanical properties were investigated. Different phosphate resin acids (PRA) were prepared by reacting synthesized phosphate ester acid (PEA) with aliphatic, cycloaliphatic, and aromatic epoxy resins. The chemical structures of the above PEA and PRAs were confirmed by Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance spectroscopy (1H-NMR), and 31P-nuclear magnetic resonance spectroscopy (31P-NMR). Subsequently, transparent IFR coatings were prepared by mixing these PRAs with hexamethoxy methyl melamine resin. Transparency of the coatings was confirmed by UV–Vis–NIR spectrophotometeric studies. Fire protection property and char compressive strength were done to investigate the fire protection ability of the coatings, and the quality of the char formed was analyzed by field emission scanning electron microscope. The decomposition process of prepared fire-retardant coatings was studied by thermogravimetric analysis. Results showed that aliphatic epoxy-based transparent coating produced tough and compact char, but the char height was negligible, and aromatic epoxy-based transparent coating produced soft and fluffy char having excellent char height; however, the fluffy char reduced protection for longer duration. Cycloaliphatic epoxy-based transparent coating produced tough and compact char with good char height, thereby reducing heat transfer during combustion, and also showed superior scratch, abrasion, impact, and water resistance compared to other compositions. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of phosphate resin acid (PRA) - Preparation of coating sample
- CHARACTERIZATION : Characterization of prepared resins - Characterization of transparent coatings - Characterization of char formed
- RESULTS AND DISCUSSION : Thermogravimetric analysis (TGA) - Transparency of coating prepared using PRAs - Physicomechanical properties of transparent IR coatings - Fire resistant test - Characterization of char
- Table 1 : Composition and acid value of prepared resins
- Table 2 : Physicomechanical performance of all PRAs
- Table 3 : Elemental composition of char obtained from the EDAX analysisDOI : https://doi.org/10.1007/s11998-020-00422-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00422-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35613
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 535–547[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22701 - Périodique Bibliothèque principale Documentaires Disponible Pretreating poly(p-phenylene benzobisoxazole) fibre with polyphosphoric acid and dyeing with disperse dyes / Yu Guan in COLORATION TECHNOLOGY, Vol. 129, N° 5 (10/2013)
[article]
Titre : Pretreating poly(p-phenylene benzobisoxazole) fibre with polyphosphoric acid and dyeing with disperse dyes Type de document : texte imprimé Auteurs : Yu Guan, Auteur ; Ya-Hong Mao, Auteur ; Qin-Min Kong, Auteur ; Xiao-Feng Zeng, Auteur ; Pu-Xin Zhu, Auteur Année de publication : 2013 Article en page(s) : p. 367-376 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants
Dispersions et suspensions
Fibres textiles synthétiques -- Analyse
Polyphénylène benzobisoxazole
Polyphosphorique, Acide
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In recent years, many advanced composite materials based on poly(p-phenylene-2,6-benzobisoxazole) fibres have become prominent in applications requiring high-strength and flame-retardance such as body armour, industrial reinforcement materials and military camouflage. However, the application of these fibres used as protective clothing is limited due to difficulties in dyeing and printing. In the present work, a process for pretreating poly(p-phenylene benzobisoxazole) fibre with polyphosphoric acid was applied, and the pretreated fibre was then dyed with disperse dyes via dip dyeing. Effects of pretreatment temperature and time on structure and properties were investigated. Surface morphology, crystallinity, chemical structure and degree of orientation of fibres were characterised. The results indicated that the supramolecular structure of the fibre was relaxed or swelled by polyphosphoric acid in the pretreatment process, so that the dyeability of poly(p-phenylene benzobisoxazole) fibre was improved, with satisfactory dye exhaustion, K/S values and dyeing fastness. Also, with the appropriate pretreatment process, the swelling effect of polyphosphoric acid on the structure of poly(p-phenylene benzobisoxazole) fibre was limited, so as to control the decrease in tensile strength and limiting oxygen index of the dyed fibre. DOI : 10.1111/cote.12025 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12025/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19355
in COLORATION TECHNOLOGY > Vol. 129, N° 5 (10/2013) . - p. 367-376[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15533 - Périodique Bibliothèque principale Documentaires Disponible