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Copolymers of styrene and maleic anhydride : reactivity ratio, physical behavior and spectral properties / Suman Kumari in PAINTINDIA, Vol. LVIII, N° 11 (11/2008)
[article]
Titre : Copolymers of styrene and maleic anhydride : reactivity ratio, physical behavior and spectral properties Type de document : texte imprimé Auteurs : Suman Kumari, Auteur ; Dhirendra Nigam, Auteur ; Devendra Agarwal, Auteur ; Indira Nigam, Auteur Année de publication : 2008 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Styrene maleic anhydride (SMA) copolymer Reactivity ratio Index. décimale : 667.9 Revêtements et enduits Résumé : Radical polymerization of styrene and maleic anhydride was carried out in N,N-dimethylformamide (DMF) as a solvent at the temperature of 80°C using benzoylperoxide as initiator. The monomer ratio was varied in the range of 0.5:1 to 4:1. The copolymer compositions were determined by CHN-elemental analysis. The copolymers were characterized by CNMR spectroscopy and was used to determine the copolymer composition. These values are comparable to those obtained from CHN-analysis although the mole fractions of styrene as observed by elemental analysis in the copolymers is slightly higher than the corresponding values observed by CNMR spectra. The ratio of styrene and maleic anhydride in the copolymer was in the range of 1.02 - 1.17 up to the monomer feed ration 2:1 and increased to about 1.53 for feed ratio of 4:1. This shows styrene and maleic anhydride have a strong tendency to form an alternating copolymer which deviates slightly when higher concentration of styrene is taken in the feed. This tendency can be explained on the basis of either of two mechanisms viz. chain transfer complex formation as well as penultimate effect due to presence of a polar solvent. The reactivity ration were determined by various methods viz Myao Lewis, Fineman Ross method, Kelen Tudos methods. The more precise value of reactivity ratio could be determined by Kelen Tudos as compared to other methods. The reactivity ratios determined by these methods shows that r1r2 <<1 which further indicated that on copolymerization of styrene and maleic anhydride, an alternating copolymer was formed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6961
in PAINTINDIA > Vol. LVIII, N° 11 (11/2008)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011351 - Périodique Bibliothèque principale Documentaires Disponible Eco friendly water-soluble binder system from Rice bran oil / S. D. Toliwal in PAINTINDIA, Vol. LVII, N° 12 (12/2007)
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Titre : Eco friendly water-soluble binder system from Rice bran oil Type de document : texte imprimé Auteurs : S. D. Toliwal, Auteur ; C. J. Patel, Auteur ; Kalpen Patel, Auteur Année de publication : 2007 Article en page(s) : p. 91-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Huile de son de rizTags : 'Rice bran oil (RBO)' ' Maleic anhydride (M.A)' N 'N-Bis (2-hydroxy ethyl) fatty amide (HEFA)' Index. décimale : 667.9 Revêtements et enduits Résumé : Rice bran oil (RBO) was malenized at 210°C using three different mole ratios of oil and maleic anhydride till desirable acid value of resultant product was achieved. The malenized products were neutralized with triethylamine to make them water compatible. N, N-Bis (2-hydroxy ethyl) fatty amide (HEFA) was prepared by reacting RBO with diethanolamine in the presence of zinc oxide as catalyst. The water compatible malenized products were blended with N, N-Bis (2-hydroxy ethyl) fatty amide (HEFA) in different ratios to prepare water based stoving compositions. Certain compositions were found to have comparable performance to that of the conventional water based alkyd-HEFA compositions when they were tested for their film and other properties. Note de contenu : - Water thinable vegetable oils
- Material and methods: Materials - Preparation of HEFA - Malenization of RBO - Neutralization of malenized oil with triethyl amine - Preparation of stoving agents - Characterization of coatings
- Result and discussion: - Mechanical properties - Chemical resistance - Solvent and water resistance - IR Spectrum
En ligne : https://drive.google.com/file/d/1f1UpqjGlNsPxiYaU2KlCwpqKJTqObxiY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11532
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Code-barres Cote Support Localisation Section Disponibilité 010770 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of polymeric dispersants from renewable DCO fatty acid and their multifunctional behavior in waterborne flat paint / Ravi Dara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)
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Titre : Synthesis of polymeric dispersants from renewable DCO fatty acid and their multifunctional behavior in waterborne flat paint Type de document : texte imprimé Auteurs : Ravi Dara, Auteur ; Ghanshyam Jaiswal, Auteur ; Girish Mirchandani, Auteur ; Randhir Parmar, Auteur ; Syed Haseebuddin, Auteur ; Gulzar Waghoo, Auteur ; Kumar Ghosh Swapan, Auteur Année de publication : 2009 Article en page(s) : p. 493-499 Note générale : Bibliogr. Langues : Américain (ame) Tags : Dehydrated castor oil fatty acids (DCOFA) Maleic anhydride Polymeric-dispersant Pigment dispersant Rheology modifier Zeta potential Minimum film-forming temperature (MFFT) Waterborne flat paint Index. décimale : 667.9 Revêtements et enduits Résumé : Copolymers containing 50% dehydrated castor oil fatty acids (DCOFA) derived from renewable resources, were synthesized via free radical solvents less polymerization with maleic anhydride, styrene, and butyl acrylate. The copolymer was crosslinked further with polyethylene glycol 400 (PEG 400) to increase its molecular weight. The copolymers with and without crosslinking were then neutralized with sodium hydroxide to prepare polymeric dispersants DFCD1 and DFCD2 respectively in aqueous medium. It was observed via surface-tension measurement that both DFCD1 and DFCD2 transfer to the air–water interface before forming any aggregates, and the ease of forming the aggregates is in the order of DFCD1 > DFCD2. The efficacy of these dispersants was examined in the dispersion of the titanium dioxide pigment and conventional extenders like calcite, talc, and china clay using flow point and zeta potential measurements. The results reveal that DFCD2 improved the dispersing ability for the pigment and extenders studied. The performance of these polymeric dispersants was also studied and compared in waterborne flat paint as a rheology modifier and pigment-dispersing agent. The paint rheology profile and dE data indicate the superior performance of the paint containing dispersant DFCD2. When used in combination with conventional styrene-acrylic latex, DFCD1 and DFCD2 reduced the minimum film-forming temperature (MFFT) of the polymer latex. DOI : 10.1007/s11998-008-9156-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9156-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7692
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Code-barres Cote Support Localisation Section Disponibilité 011845 - Périodique Bibliothèque principale Documentaires Disponible