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Surface tension studies in colloidal unimolecular polymers / Ashish Zore in COATINGS TECH, Vol. 18, N° 2 (02/2021)
[article]
Titre : Surface tension studies in colloidal unimolecular polymers Type de document : texte imprimé Auteurs : Ashish Zore, Auteur ; Michael van de Mark, Auteur Année de publication : 2021 Article en page(s) : p. 24-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères -- propriétés mécaniques
Caractérisation
Granulométrie
Latex
Poids moléculaires
Polycarboxylates
Polymères -- Synthèse
Polymères unimoléculaires colloïdaux
Polysulfones
Polyuréthanes
Tension superficielleIndex. décimale : 668.9 Polymères Résumé : Colloidal unimolecular polymer particles, or CUPs, are true nanoscale charged particles of size less than 10 nm that are made by a simple method that allows for preparation of additive-free, zero-volatile organic content (VOC) and stable dispersions. These CUP particles are made from a single polymer chain containing a well-balanced number of hydrophobic and hydrophilic units (Figure 1). The polymer chain is transformed into a CUP particle because the polymer-polymer interaction exceeds polymer-solvent interaction during the addition of water to the polymer in dilute solution in a low-boiling, water-loving solvent, resulting in collapse of the chain to form a particle.
This process is like formation of micelles, or the water reduction process in water-reducible coatings.1 The charged groups on the surface of the particles provide stability and prevent aggregation due to ionic repulsion. The CUP suspension is free of any additives or surfactants as it contains only charged particles, water, and counterions. Due to the process simplicity, it is easy to control the particle size, charge density on the surface, and composition of these particles.2 CUP particles can also be a good model material for study of protein due to similarities in their size. They can also have potential applications in the field of coatings, drug delivery, catalyst matrix, etc.
CUPs have a great potential in the field of coatings as demonstrated in several publications by Van De Mark et.al. They can be used as coating resin in conjunction with latex and polyurethane dispersions (PUDs) and can be cured with an aziridine3 or a melamine crosslinker4. CUPs with sulfonic acids as the charged stabilizing group can be used as a catalyst for waterborne curing such as acrylic-melamine systems.5 CUPs with amine functional groups CUPs with amine functional groups have been synthesized and used as a crosslinker for waterborne epoxy coatings.6 The CUP particles are hydrated with a layer of water around them, often referred to as surface or bound water, which is non-freezable.Note de contenu : - EXPERIMENTAL : Synthesis of polymer and water reduction - Characterization
- RESULTS AND DISCUSSION : Characterization of polymers - Particle size analysis - Equilibrium surface tension behavior
- Fig. 1 : Formation of CUPs
- Fig. 2 : Surface tension vs concentration behavior for PUD1, PUD2 (solid triangles) and PUD2 diluted to different concentration using 12.9% NMP-water mixture instead of water - Dynamic surface tension behavior
- Fig. 3 : Surface tension vs concentration behavior for polymer 2 (CUPs), PUD1 and latex
- Fig. 4 : Equilibrium surface tension of the carboxylate CUPs (polymers 1 and 2), sulfonate CUPs (polymer), and QUAT-CUPs (polymer 4)
- Fig. 5 : Dynamic surface tension behavior of the latex, PUD1, and CUPs at different surface ages at 3% solids
- Fig. 6 : Dynamic surface tension behavior of the carboxylate (polymer 2), sulfonate (polymer3), and QUAT (polymer 4) CUPs at different surface ages
- Table 1 : Acid number, densities, and molecular weights of the copolymers
- Table 2 : Molecular weights and particle size of the CUPs
- Table 3 : Fitting parameters for dynamic surface tension vs surface age at 0.5 mol/m3 and diffusion coefficient (Dc) at 25°CEn ligne : https://drive.google.com/file/d/1Z_Mny6LNFkOkYOVQS4cTyTGyEAqVV8xm/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35256
in COATINGS TECH > Vol. 18, N° 2 (02/2021) . - p. 24-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22580 - Périodique Bibliothèque principale Documentaires Disponible 22581 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and properties of nitrogen heterocycle-functionalized core-shell hyperbranched polyester / Subramanian Karpagam in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
[article]
Titre : Synthesis and properties of nitrogen heterocycle-functionalized core-shell hyperbranched polyester Type de document : texte imprimé Auteurs : Subramanian Karpagam, Auteur ; S. Guhanathan, Auteur Année de publication : 2015 Article en page(s) : p. 233-242 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Analyse thermique
Azote
Calorimétrie
Caractérisation
Composés hétérocycliques
Core-Shell
Diélectriques
Poids moléculaires
Polyesters
Polymères -- Propriétés électriques
Polymères -- Propriétés thermiques
Polymères -- Synthèse
Polymères ramifiés
Résonance magnétique nucléaire
ThermogravimétrieIndex. décimale : 668.4 Plastiques, vinyles Résumé : Core-shell hyperbranched polyesters (HBPE) of third generation prepared from 2,2?-bis (hydroxymethyl) propionic acid (Bis-MPA) as an ABx monomer and N-heterocyclic (indole, piperidine and piperazine) phosphoryl dichloride as a core molecule by melt condensation process. These polymers were characterized by FT-IR, 1H NMR, 13C NMR, 31P NMR, elemental analysis, and MALDI spectroscopy. The thermal behavior of the polymers has been investigated by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC). There is no weight loss observed until 250 °C under nitrogen atmosphere. DSC showed that the glass transition temperatures was about ?14 and ?30 °C for the prepared core-shell HBPE. The dielectric properties such as dielectric constant and loss factor for these polyesters were also studied with respect to change of frequency (50 Hz to 5 MHz). Note de contenu : - EXPERIMENTAL : Materials - Methods - Measurements of dielectric properties - Synthesis of N-heterocyclic phosphoryl dichloride - Synthesis of phosphorous containing third generation (G3) of N-heterocyclic hyperbranched polyester (HBPE)
- RESULTS AND DISCUSSION : Synthesis of hyperbranched polyesters - Characterization of hyperbranched polyesters - Degree of branching - Molecular weight and molecular weight distribution - Electrical properties - Thermal propertiesDOI : 10.3139/217.2990 En ligne : https://drive.google.com/file/d/1di8F6zbcE4a7EKMS620xoEVRSJ-DM_m2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23905
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 233-242[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and properties of water-dispersible polyisocyanates carrying sulfonate / Zhongkang Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : Synthesis and properties of water-dispersible polyisocyanates carrying sulfonate Type de document : texte imprimé Auteurs : Zhongkang Peng, Auteur ; Liuyan Tang, Auteur ; Ye Yuan, Auteur ; Jinqing Qu, Auteur Année de publication : 2020 Article en page(s) : p. 345-359 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dispersions et suspensions
Hydrophilie
Poids moléculaires
Polyisocyanates
Polymères -- Synthèse
Polymères en émulsion
Polyuréthanes
Résistance à l'humidité:Résistance à l'eau
Revêtements bi-composant
Revêtements en phase aqueuse
Revêtements organiques
Stabilité au stockage
Sulfonates
Transparence (optique)
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of N-alkylated aminosulfonic acids (NASAs) were synthesized with 1,4-butane sultone and primary amines and then reacted with hexamethylene diisocyanate trimer to obtain water-dispersible polyisocyanates (WDPs). Two-component waterborne polyurethane (2K-WPU) coatings were finally prepared by the reaction of WDPs and aqueous hydroxyl resins. The structures and properties of WDPs and 2K-WPU coatings were characterized. The effects of the categories and amounts of NASAs on the properties of WDPs and 2K-WPU coatings, including viscosities, water resistance and transparency, were investigated. The results showed that the average molecular weights and viscosities of the WDPs increased with the increase in the amounts and molecular weights of NASAs. 3-(Cyclohexylamino)-1-propanesulfonic acid possesses a high molecular weight, resulting in low-concentration –SO3 per mass, so a high concentration up to 3.5 wt% was needed to meet water-dispersible requirements. On the other hand, 3-isobutylamino-1-propanesulfonic acid (IBAPS) has high-concentration –SO3 per mass and only a low concentration (2.5 wt%) was required to offer satisfactory water dispersibility. 2K-WPU film cured by IBAPS-WDP displayed high gloss, good transparency and excellent water resistance owing to suitable steric hindrance and high content of –SO3H per mass. Note de contenu : - EXPERIMENTAL : Materials - The synthesis of NASAs - The synthesis of WDPs - Preparations of 2K-WPU films - Characterization
- RESULTS AND DISCUSSION : Synthesis and structures of NASAs and WDPs - Average molecular weight and viscosities of WDPs - Water dispersibility of WDPs - Storage stability of WDPs - Properties of 2K-WPU films - Relationship between substituted group of NASAs and properties of WDPs and 2K-WPUDOI : https://doi.org/10.1007/s11998-019-00277-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00277-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33986
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 345-359[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible Synthesis, characterisation and application of environment friendly polymers for producing sustainable leather / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 1 (01-02/2021)
[article]
Titre : Synthesis, characterisation and application of environment friendly polymers for producing sustainable leather Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shazad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur Année de publication : 2021 Article en page(s) : p. 19-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biopolymères -- Synthèse
Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Eaux usées -- Analyse
Formaldéhyde -- Suppression ou remplacement
Mélamine-Méthylglyoxal
Poids moléculaires
Retannage
Rhéologie
Stabilité thermique
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of formaldehyde-free melamine-methylglyoxal resins has been produced at various mole ratios of reactants. The methylglyoxal to melamine mole ratio (MG/M) was varied from 3 to 6 and the sodium metabisulfite to melamine mole ratio (SMB/M) was varied from 0.05 to 0.2. Viscosity trend of resins within the series was examined. The prepared resins were used as retanning agents and their improved mechanical and organoleptic properties were noticed in comparison with a commercial melamine-formaldehyde resin. The morphology of grain surface and fibre structure of the leathers was investigated by scanning electron microscopy (SEM). Thermal stability of the optimal resin was assessed and observed to show an improvement over the commercial melamine-formaldehyde resin. Molecular weight and FTIR study of optimal resin was also pursued. Determination of free formaldehyde confirmed that the resulting leather was free from formaldehyde. A pollution load study of retanning effluent showed a significant reduction in chemical oxygen demand, total suspended solids and total dissolved solids for the optimal resin reflecting its improved exhaustion due to optimised molecular size and ability to undergo in situ polymerisation in collagen fibres. The results have shown that the melamine resins of this novel work are suitable for producing formaldehyde-free leather with improved retanning properties and reduced pollution load of the wastewater. Methylglyoxal has been proved as a successful alternate of formaldehyde in resin synthesis to control air emissions and carcinogenic effects while producing sustainable leather. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of novel melamine resins using methylglyoxal as a condensing agent
- RESULTS AND DISCUSSION : Schematic route of synthesis - Rheology of resins - Evaluation of retanning performance of SMMG resins - Mechanical proerties of leather treated with SMMG resins - Organoleptic properties of the leather treated with novel SMMG resins - Quantitative estimation of free formaldehyde content in treated leather - Molecular weight determination of optimal SMMG resin - Structural elucidation of optimal SMMG resin - Comparative thermo gravimetric analysis of optimal SMMG resin - Analysis of effluent
- Table 1 : Mole ratio and physical characteristics of novel SMMG resins - Experimental data
- Table 2 : Leather processing materials, conditions and recipe
- Table 3 : Mechanical properties of leather treated with sulfonated melamine-methylglyoxal resins
- Table 4 : Dependence of flow time, relative viscosity, specific viscosity
- Table 5 : Comparative characteristics of effluent after retanning with novel SMMG#06 resin and control resin
- Scheme 1 : Reaction of melamine and methylglyoxal at different mole ratio
- Scheme 2 : Sulfonation of melamine-methylglyoxal derivative
- Scheme 3 : Condensation of sulfonated tetrahydroxy melamine to form polymer moleculeEn ligne : https://drive.google.com/file/d/14IGqeHhbQcRyM88CW02qqG0GNzcv3Cr6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35314
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 1 (01-02/2021) . - p. 19-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22599 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of an amphoteric polymer auxiliary agent and its application to chrome-free leather / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 6 (11-12/2018)
[article]
Titre : Synthesis of an amphoteric polymer auxiliary agent and its application to chrome-free leather Type de document : texte imprimé Auteurs : Luo Jianxun, Auteur ; Feng Yanjuan, Auteur Année de publication : 2018 Article en page(s) : p. 298-303 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Colorants
Composés amphotériques
Copolymères
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Teinture
Cuirs et peaux de chèvres
Formulation (Génie chimique)
Oxazolidine
Poids moléculaires
Polymères -- Analyse
Polymères -- Synthèse
Produits de nourriture du cuir
Tanins végétaux
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-SynthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to reduce the disadvantages of chrome tannage, chrome-free tannage was developped by many technologists and tanneries. However, because of the structures and charge of the tanning materials in the chrome-free tannage, the absorption rate of the chrome-free leather for anionic dyestuffs, re-tanning agents and fatliquors is lower than that of the chrome-tanned leather. Therefore, in order to improve the absorptivity of the chrome-free leather for these products, an amphoteric polymer auxiliary agent was synthesized with methyl-acrylic acid, sodium methylallyl sulfonate and dimethyl diallyl ammonium chloride (DMDAAC) by free radical copolymerization using ammonium persulfate at 80°C for 3 hours. The molar ratio of methyl-acrylic acid, sodium methylallyl sulfonate and dimethyl diallyl ammonium chloride was confirmed to be 1.0/0.3/ 1.0. The structure of the amphoteric polymer auxiliary agent was characterized by FTIR, H-NMR, C-NMR. The charge and properties of the solution of the amphoteric polymer auxiliary agent were characterised. Applied results of the amphoteric polymer auxiliary on the absorption of chrome-free leather for dyestuff and fatliquor, show that it has strong auxiliary absorptive capacity and the absorptive rate of dyestuff and fatliquor is more than 96%. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of the amphoteric polymer auxiliary agents - Application of series of the copolymers and the selection of the synthetic recipe - Molecular weight of the amphoteric polymer auxiliary agent and its structure determination - Test of isoelectric point (pI) of the amphoteric polymer auxiliary agent - Application and the optimum amount of the amphoteric polymer auxiliary agent on goatskin crust tanned by combination tannages
- RESULTS AND DISCUSSION : Analysis of the optimised formulation of the copolymer - Analysis of the molecular weight and the structure optimised formulation of the copolymer and its characteristics
- Table 1 : Parameters of orthogonal experiment
- Table 2 : Formulation of Lg(3 4 copolymer reaction with methyacrylic acid, dimethyl diallyl ammonium chloride, sodium methylallyl sulfonate
- Table 3 : The process of dyeing of the goatskin leather tanned by combination tannages with vegetable tannins and oxazolidine
- Table 4 : The process of fatliquor of the goatskin leather tanned by combination tannages with vegetable tannins and oxazolidine
- Table 5 : Results of Lg(3 4 copolymer reaction and application
- Table 6 : Relation between the band and the relevant group of APAA
- Table 7 : Relation between the band and the relevant group of APAA
- Table 8 : Relation between the band and the relevant group of APAA
- Fig. 1 : The synthesis of the amphoteric polymer auxiliary agent
- Fig. 2 : Curve of GPC of APAA
- Fig. 3 : IR spectrum of APAA
- Fig. 4 : 1H-NMR of APAA
- Fig. 5 : 13C-NMR of APAA
- Fig. 6 : relation between zeta potential and pH of APAA
- Fig. 7 : Relationship of the uptake of dyestuff and absorptive rate of fatliquor during the dyeing and fatliquoring of the goatskin crust tanned by combination tannage with vegetable tannins and aluminium tanning agent and the dosage of APAA
- Fig. 8 : Relationship of the uptake of dyestuff and absorptive rate of fatliquor during the dying and fatliquoring of the goatskin crust tanned by combination tannage with vegetable tannins oxazolidine and the dosage of APAAEn ligne : https://drive.google.com/file/d/1BiwvJszgvFJ3WgL2uSOk6h_DBCwO-A9M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31324
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 6 (11-12/2018) . - p. 298-303[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20391 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of aniline 2,5 disulfonic acid modified ecofriendly melamine resins and their performance evaluation as leather retanning agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)
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