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Effect of hexamethylene diisocyanate as compatibilizer on the mechanical properties of banana fiber/poly(butylene succinate) composites / Tetsuto Kajiyama in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 1 (03/2013)
[article]
Titre : Effect of hexamethylene diisocyanate as compatibilizer on the mechanical properties of banana fiber/poly(butylene succinate) composites Type de document : texte imprimé Auteurs : Tetsuto Kajiyama, Auteur ; T. Yasuda, Auteur ; S. Mimoto, Auteur ; K. Shimizu, Auteur ; K. Hayashi, Auteur ; T. Yamanaka, Auteur ; M. Murakami, Auteur Année de publication : 2013 Article en page(s) : p. 58-63 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection
Composites à fibres végétales -- Propriétés mécaniques
Diisocyanate d'hexaméthylène
Fibres de banane
Fibres végétales
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Mélange
Polybutylène succinate
Résistance au chocs
Traction (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : We prepared banana fiber (BF)/poly(butylene succinate) (PBS) composites using hexamethylene diisocyanate (HDI) as a compatibilizer. BF was treated with NaOH aqueous solution (BF-A). Both BF/PBS/HDI and BF-A/PBS/HDI composites were made by applying a batch type twin-kneader at 130 °C. Dumbbell specimens were prepared by an injection molding machine at 130 °C. Effect of concentration of NaOH aq on tensile strength and impact strength, effect of amount of HDI on tensile strength and Izod impact strength, and effect of mixing time on tensile strength and Izod impact strength of BF/PBS/HDI and BF-A/PBS/HDI composites were studied. When contents of HDI in composites were increased, tensile strength increased. In addition, when mixing times were increased, tensile strength increased. Although the mechanical properties of PBS were first degraded with the addition of BF, alkaline treatment to BF and the addition of HDI improved the mechanical properties. This probably due to the promotion of the adhesion between BF and PBS. The surface morphology of the fracture surfaces of the composites were observed with a scanning electron microscope (SEM). It shows that higher mechanical properties can be expected from compatibilized composites based on BF-As with aliphatic polyesters. Note de contenu : - EXPERIMENTS : Materials - Alkaline treatment of banana fiber - Mixing of materials - Molding of composites - Mechanical test of composites - SEM observation
- RESULTS AND DISCUSSION : Effect of concentration of NaOH Aq on tensile properties and izod impact strength - Effect of amount of HID on tensile properties and izod impact strength - Effect of mixing time on the strength of PB/PBS/HDIDOI : 10.3139/217.2661 En ligne : https://drive.google.com/file/d/1t2_US46qJUEJIfiGIvRl5RP6cNfg9mzE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17765
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 1 (03/2013) . - p. 58-63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14763 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterization of novel water-based poly(urethane-imide) nanodispersions / Baharak Pooladian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
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Titre : Synthesis and characterization of novel water-based poly(urethane-imide) nanodispersions Type de document : texte imprimé Auteurs : Baharak Pooladian, Auteur ; Mir Mohammad Alavi Nikje, Auteur Année de publication : 2018 Article en page(s) : p. 643-647 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique
Copolymères en émulsion
Diisocyanate d'hexaméthylène
Dispersions et suspensions
Polyuréthane-imide
Polyuréthanes
Rhéologie
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(urethane-imide) nanodispersions were synthesized in four steps, as described below. In the first step, polyurethane prepolymer was prepared by the reaction of hexamethylene diisocyanate and polypropylene glycol in the presence of a catalytic amount of dibutyltin dilaurate. In the second step, poly(urethane-imide) prepolymer was prepared by the reaction of synthesized polyurethane prepolymer in the first step with pyromellitic dianhydride in dimethylformamide. In the third step, the prepared poly(urethane-imide) (PUI) reacted with 2,2-bis (hydroxymethyl) propionic acid, and the reaction completed in the last step which involved neutralization and dispersion in water, where acidic poly(urethane-imide) was neutralized by the addition of triethylamine. The prepared poly(urethane-imide) dispersions were characterized by fourier transform infrared spectrometry, proton nuclear magnetic resonance spectroscopy (1HNMR), thermogravimetric analysis, and dynamic laser scattering. A series of PUI dispersions with 30 wt% solid content, viscosities of 9 ± 1 cps, and particle sizes of 78–133 nm range were prepared and characterized. Note de contenu : - EXPERIMENTAL : Materials - Measurements - Synthesis of water-based poly(urethane-imide) nanodispersions
- RESULTS AND DISCUSSION : FTIR spectra analysis - HNMR analysis - TGA analysis - DLS analysis - ViscosityDOI : 10.1007/s11998-017-0047-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0047-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30760
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 643-647[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of ADI/HDI hybrid isocyanurate and its application in polyurethane coating / Guiyou Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)
[article]
Titre : Synthesis of ADI/HDI hybrid isocyanurate and its application in polyurethane coating Type de document : texte imprimé Auteurs : Guiyou Wang, Auteur ; Kang Li, Auteur ; Wei Zou, Auteur ; Aiguo Hu, Auteur ; Chunpu Hu, Auteur ; Yangping Zhu, Auteur ; Chen Chen, Auteur ; Glynn Guo, Auteur ; Aaron Yang, Auteur ; Ray Drumright, Auteur ; John Argyropoulos, Auteur Année de publication : 2015 Article en page(s) : p. 543-553 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bis(isocyanatométhyl)cyclohexane
Caractérisation
Catalyse
Diisocyanate d'hexaméthylène
Isocyanurates
Polyuréthanes
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Hybrid isocyanurate was prepared by solvent-free trimerization of hexamethylene diisocyanate (HDI) and bis(isocyanatomethyl) cyclohexane (ADI), and characterized by gel permeation chromatography (GPC), gas chromatography (GC), nuclear magnetic resonance (NMR), and electrospray ionization mass spectrometry (ESI–MS). The results showed that ADI/HDI hybrid isocyanurate could be prepared with 2-hydroxypropyl-trimethyl-azanium catalyst at reaction temperatures between 50°C and 70°C. Both the GC and 1H NMR analyses identified a favorable linear relationship between the feed ratio of the starting monomers and the amount of each individual isocyanate incorporated into the oligomer (reaction ratio). Compared to coatings prepared from the mixture of ADI isocyanurate and HDI isocyanurate, the coatings from ADI/HDI hybrid isocyanurate possess higher distinctness of image. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ADI/HDI hybrid isocyanurate - Preparation of two-component polyurethand coatings - Characterization and evaluation
- RESULTS AND DISCUSSION : GPC analysis and results - GC analysis and results - H NMR analysis and results - ESI-MS analysis and results - Appearance of polyurethane coatings based on ADI/HDI hybrid isocyanurateDOI : 10.1007/s11998-014-9650-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9650-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24178
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 3 (05/2015) . - p. 543-553[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17244 - Périodique Bibliothèque principale Documentaires Disponible The formation of polyester-melamine/urethane coatings / Nadezda Denisova in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4651 (05/2019)
[article]
Titre : The formation of polyester-melamine/urethane coatings Type de document : texte imprimé Auteurs : Nadezda Denisova, Auteur ; Natalija B. Skopintseva, Auteur ; Daria Afanaseva, Auteur ; Evgenii Indeikin, Auteur Année de publication : 2019 Article en page(s) : p. 48-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Coil coatings
Copolymère mélamine-formaldéhyde
Diisocyanate d'hexaméthylène
MéthylationLa méthylation est l'attache ou la substitution d'un groupement méthyle sur un substrat. La déméthylation est au contraire, la suppression d'un groupe méthyle sur un substrat.
Réticulation (polymérisation)
Revêtements -- Analyse
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : One of the cost-effective ways to significantly influence the coating formation process and the performance of polyester coatings is to use a cross-linking agent containing an isocyanate. Methylated melamine-formaldehyde with a high degree of alkylation (HMMM) and methyl ethyl ketoxime-blocked hexamethylene diisocyanate (HDI) were used for polyester resin cross-linking. The influence of cross-lin king agents on coating performance and characteristics was studied using Small Amplitude Oscillatory Shear Rheomenty (SAOS), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) techniques. The cross-linking degree of the polyester system containing the mixture of HMMM and HDI was shown to be significantly lower than that of the systems where only one of the cross-linking agents was used. High loss modulus values G" in the system with HMMM as compared to the system with HDI can be explained by a less dense three-dimensional network structure. With the decrease of HMMM and HDI the formation of three-dimensional network starts at a higher temperature. At the same time, when only the hardener content is reduced it leads to the decrease of the cross-linking degree. Note de contenu : - Table 1 : System ingredients
- Table 2 : Cross-linking reaction start temperatures for the compositions studies
- Table 3 : Cross-link concentrations for the system
- Table 4 : Physical and mechanical properties of the films, PTM = 224°C, 60 sec
- Fig. 1 : Storage modulus (G') and loss modulus (G") during coating curing
- Fig. 2 : TGA - analysis a) Sample 1, b) Sample 2
- Fig. 3 : Storage modulus (G') and loss modulus (G") during coating curing
- Fig. 4 : The influence of curing temperature on residual heat of reaction
- Fig. 5 : The influence of curing temperature on the TgEn ligne : https://drive.google.com/file/d/1BasgjNlsCHEPzXR6seqIu44IjZbJI9pu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32608
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4651 (05/2019) . - p. 48-50[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20960 - Périodique Bibliothèque principale Documentaires Disponible The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating / Qian Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating Type de document : texte imprimé Auteurs : Qian Wang, Auteur ; Hang Xu, Auteur ; ShengZhong Zhou, Auteur ; Sébastien Garnier, Auteur ; Stefan Füldner, Auteur ; Lin Ye, Auteur ; Zengguo Feng, Auteur Année de publication : 2017 Article en page(s) : p. 1279-1288 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diisocyanate d'hexaméthylène
Diisocyanate de toluèneLe diisocyanate de toluène (TDI : Toluene diisocyanate) est un composé organique, toxique et allergène, appartenant au groupe des isocyanates.
C'est l'un des monomères de départ utilisés pour la production de polyuréthane par polymérisation.
Le TDI peut réagir avec un polyol ce qui permet de former une structure uréthane.
Le TDI est produit industriellement en faisant réagir du diaminotoluène (en fait un mélange de 2,4-diaminotoluène et de 2,6-diaminotoluène dans un ratio 80:20) avec du phosgène (COCl2), ce qui conduit au TDI avec une production secondaire de chlorure d'hydrogène HCl.
Il sert à fabriquer des mousses expansées, molles, semi-rigides ou rigides de polyuréthane, des adhésifs, peintures, enduits souples, élastomères, etc.
Elasticité
Oligomères
Polymères -- Synthèse
Polyuréthanes
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The hybrid cyclic isocyanate trimer with appropriate functionality and good solvent tolerance which can be used as a building block to construct polyurethane (PU) coatings was prepared by cyclo-oligomerization of toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI). Among all the tested catalysts, the self-made catalyst 3-(trimethylammonio)propyl carbonate (Cat. 4) was found to possess enough catalytic efficiency to confirm the NCO conversion to reach about 50% with both high (1 wt%) and low (0.25 wt%) catalyst loading at low temperature (40°C). The IR and NMR results proved the formation of a hybrid trimer, while HPLC results showed hybrid TDI/HDI trimer predominated in the product and only trace amounts of TDI monomer (<0.5 wt%) and oligomer with higher degree of polymerization (DP) remained. Furthermore, the formed hybrid oligomer exhibited excellent solvent tolerance to benzene, chlorinated, and acetate solvents. Consequently, Cat. 4 was demonstrated to be a suitable catalyst for cyclo-oligomerization since it not only possessed enough catalytic efficiency at low temperature but also hardly resulted in higher DP oligomer. Furthermore, the curing process with PTHF-r-PEO polyol was conducted as a pilot experiment to form PU coatings at room temperature. The disappearance of NCO group in IR spectrum as well as higher storage modulus against loss modulus implied the successful curing process. The strain–stress test showed the high tensile strength of formed PU coating, whereas the rheological test and dynamic mechanical analyzer proved the formed PU coating was a typical elastic material with good crosslink structure. These results indicate the promising potential of formed PU made from hybrid TDI/HDI trimer for coating applications. Note de contenu : - EXPERIMENTAL : Materials and measurement - Synthesis of TDI/HDI hybrid trimer - Synthesis of polyurethane with TDI/HDI oligomers
- RESULTS AND DISCUSSION : Catalytic screening - The characterization of TDI/HDI trimers - Influence of the ratio of TDI/HDI on the oligomerization - Solvent compatibility - The curing process of TDI/HDI trimerDOI : 10.1007/s11998-017-9926-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9926-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29628
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Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible