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Blends of cardanol-based epoxidized novolac resin and CTBN for application in surface coating : a study on thermal, mechanical, chemical, and morphological characteristics / Ranjana Yadav in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)
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Titre : Blends of cardanol-based epoxidized novolac resin and CTBN for application in surface coating : a study on thermal, mechanical, chemical, and morphological characteristics Type de document : texte imprimé Auteurs : Ranjana Yadav, Auteur ; Deepak Srivastava, Auteur Année de publication : 2010 Article en page(s) : p. 557-568 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements Tags : Cardanol 'Résine novolac' 'Carboxyl-terminated butadiene acrylonitrile' (CTBN) 'Analyse calorimétrique différentielle' (DSC) thermogravimétrique' (TGA) Index. décimale : 667.9 Revêtements et enduits Résumé : Blend samples of cardanol-based epoxidized novolac resin and different weight percentages of carboxyl-terminated butadiene acrylonitrile (CTBN) were developed and cured with stoichiometric amounts of aliphatic amine. The formation of various products during the curing of blend samples has been studied by Fourier-transform infrared spectroscopy. The dynamic differential scanning calorimeter scans showed that the pure epoxies and their blend samples with CTBN cured in the temperature range of 100–150°C. The blend sample containing 15 wt% CTBN showed the least cure time (at 120°C) among all other blend samples. Upon evaluation, it was found that blend samples exhibit better properties compared to pure epoxy resin in terms of increase in impact strength and elongation-at-break of the casting and gloss, scratch hardness, adhesion, and flexibility of the film. The improvement in these properties indicates that the rubber modified resin would be more durable than the epoxy based on cardanol. Chemical and morphological properties of the formulated resins were also determined. The thermal stability of the blend samples containing 15 wt% CTBN in epoxy resin was the highest among all other prepared systems. The blend morphology, studied by scanning electron microscope, showed the presence of precipitated discrete rubber particles, which dispersed throughout the epoxy matrix—i.e., they revealed the presence of two-phase morphological features. DOI : 10.1007/s11998-009-9235-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9235-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9911
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 557-568[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012448 - Périodique Bibliothèque principale Documentaires Disponible CNSL-derived polymers for use in surface coatings / K. S. Shukla in PAINTINDIA, Vol. LII, N° 2 (02/2002)
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Titre : CNSL-derived polymers for use in surface coatings Type de document : texte imprimé Auteurs : K. S. Shukla, Auteur ; S. Prasad, Auteur ; Pramod Kumar, Auteur ; Deepak Srivastava, Auteur Année de publication : 2002 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Cashew Nut Shell Liquid (CNSL), a by-product of the cashew industry, is one of the potential natural sources of phenols/monomers for the synthesis of a variety resins/polymers for use in surface coatings. CNSL, a dark-coloured product, is obtained from the shell of cashew nut. Cashew tree, Anacardium Accidentale Linn, of Brazil origin, is now being grown extensively in India also. In the present paper, extraction and refining of CNSL has been briefly outlined to get a technically useful product. The chemistry of CNSL and its components has been discussed along with the polymerization of CNSL. Possible modifications of CNSL have been considered to yield useful film-formers for surface coatings of improved technical utility. CNSL-aldehyde resins have been found to be superior to ordinary phenol-aldehyde resins when used in surface coatings, and as insulating materials. The important polymeric materials which have been developed by using CNSL as one of the constituents or a modifier, such as CNSL-aldehyde condensation products, CNSL-modified phenolic resins, polyesters, epoxies and polyurethanes, have been elaborated. Both solvent-borne and waterborne coating formulations have been discussed. Water-dispersible and water-soluble resins with their preparation and properties have been covered in this paper with the purpose to draw guidelines for the designing of ecofriendly polymeric film-formers for surface coatings. Note de contenu : - Extraction of CNSL
- Refining
- Chemistry of CNSL and its components
- Polymerization of CNSL
- CNSL-aldehyde condensation products
- Epoxy resins
- Miscellaneous coating materials
- Water-borne coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12302
in PAINTINDIA > Vol. LII, N° 2 (02/2002) . - p. 29-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001278 - Périodique Bibliothèque principale Documentaires Disponible Effect of phenol concentration on cure and epoxide equivalent weight (EEW) of cardanol based epoxidized novolac type phenolic resins / Priti Shukla in PAINTINDIA, Vol. LX, N° 9 (09/2010)
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Titre : Effect of phenol concentration on cure and epoxide equivalent weight (EEW) of cardanol based epoxidized novolac type phenolic resins Type de document : texte imprimé Auteurs : Priti Shukla, Auteur ; S. B. Yadaw, Auteur ; Deepak Srivastava, Auteur Année de publication : 2010 Article en page(s) : p. 85-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Chromatographie sur gel
Epoxydes
Fourier, Spectroscopie infrarouge à transformée de
Phénoplastes
Résonance magnétique nucléaire
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Cardanol-based epoxidized novolac type phenolic resins were synthesized with molar excess of epichlorohydrin and phenolic resins based on phenol caidanol formaldehyde, in alkaline medium, at a temperature of 120°C for about 10 h. The synthesized resins were characterized by fourier-transform infrared spectroscopic (FT-IR), nuclear magnetic resonance (MMR) spectroscopis and gel-permeation chromatographic (GPC) analysis. All the samples were cured at 120°C, as obtained from DSC scan. It was also found that the cure time decreased as the phenol content was increased in the epoxy matrices containing both phenol and cardanol. The presence of phenol moiety in such epoxidized novolac resins increased the epoxide equivalent weight (EEW) upto a certain level and decreased thereafter. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10488
in PAINTINDIA > Vol. LX, N° 9 (09/2010) . - p. 85-96[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012661 - Périodique Bibliothèque principale Documentaires Disponible Environmentally preferred coatings from modified cardanol-based epoxidized novolac resin / Ranjana Yadav in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)
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Titre : Environmentally preferred coatings from modified cardanol-based epoxidized novolac resin Type de document : texte imprimé Auteurs : Ranjana Yadav, Auteur ; Deepak Srivastava, Auteur Année de publication : 2008 Article en page(s) : p. 85-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol
Chromatographie sur gel
Copolymère carboxyle terminé de Butadiène-acrylonitrile
Copolymère carboxyle terminé liquide de butadiène
Epoxydes
Formaldéhyde
Fourier, Spectroscopie infrarouge à transformée de
Ressources renouvelables
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Cardanol-based epoxidized novolac resin was modified with different weight ratios of liquid rubbers, viz. carboxyl-terminated polybutadiene (CTPB) and carboxyl-terminated butadiene - acrylonitrile copolymer (CTBN) for its use as environment friendly coating materials. The cardanol-based epoxy resin was synthesized from novolac resin, prepared from cardanol (C) and formaldehyde (F) having C/F molar ratio equals 1:0.6. A tricarboxylic acid such as citric acid was used as a catalyst for the system. The novolac resin was epoxidized with molar excess of epichlorohydrin at 120°C in basic medium. The epoxidized novolac resins were, separately, blended with different weight ratios of different carboxyl-terminated liquid rubbers and ranging between 0-25 w % with an interval of 5 wt%. All the blends were cured at 120°C with stiochiometric amount ofpolyamine. The formation of various products during the synthesis of cardanol-based novolac resin, epoxidized novolac resin and blending of epoxidized novolac resin with different liquid rubber have been studied by Fourier-transform infra-red (FTIR) spectroscopic analysis. The molecular weights of the prepared novolac and their epoxidized novolac resins were determined by gel permeation chromatographic (GPC) analysis. These blend samples were also found to be most thermally stable systems. Note de contenu : EXPERIMENTAL : Materials - Synthesis of cardanol based novolac-type phenolic resin - Preparation of blends of epoxidized novolac resin and different carboxyl-terminated liquid rubbers - Characterization
RESULTS AND DISCUSSION : Synthesis of cardanol-formaldehyde novolac type phenolic resin - FTIR and GPC of cardanol-formaldehyde resin - Epoxidation of novolac prepolymer - FTIR analysis of uncured and cured samples - Effect of CTPB and CTBN on cure time of blend samples - Morphological properties - Chemical resistancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12115
in PAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 85-100[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010765 - Périodique Bibliothèque principale Documentaires Disponible Mechanical, chemical, and curing characteristics of cardanol–furfural-based novolac resin for application in green coatings / Riya Srivastava in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)
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Titre : Mechanical, chemical, and curing characteristics of cardanol–furfural-based novolac resin for application in green coatings Type de document : texte imprimé Auteurs : Riya Srivastava, Auteur ; Deepak Srivastava, Auteur Année de publication : 2015 Article en page(s) : p. 303-311 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Cardanol
Chimie écologique
Fourier, Spectroscopie infrarouge à transformée de
Furfural
Résistance chimique
Résonance magnétique nucléaire
Ressources renouvelables
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : The present research work focuses on the mechanical, chemical, and curing characteristics of novolac resin based on renewable resource materials such as cardanol and furfural. Cardanol, a metasubstituted phenol, is a renewable organic resource obtained as a byproduct of the cashew industry. Furfural, an aromatic aldehyde, is also a renewable resource obtained as an agricultural waste product. Novolac resin has been synthesized by the condensation of cardanol with furfural in the presence of an oxalic acid catalyst and using varied molar proportions of the reacting monomers. The reaction was performed at 120°C. The progress of the reaction was monitored by determining the free formaldehyde and free phenol content. The prepared cardanol–furfural-based novolac resins were further characterized by various techniques such as infrared and nuclear magnetic resonance spectroscopic analysis. The resins were cured using the most suitable agent, hexamethylenetetramine. The differential scanning calorimetric technique was used to investigate the curing behavior of the prepared samples. The cured film samples were used for the determination of mechanical properties such as adhesion, flexibility, scratch hardness, gloss, and impact resistance; these cured film samples were also used to observe the effect of various chemicals and solvents (chemical resistance properties) such as sulfuric acid, acetic acid, sodium hydroxide, sodium carbonate and methanol, methyl ethyl ketone, xylene, and deionized water, respectively, on the surface of the film. The resulting coatings based on prepared cardanol–furfural resin were found to have excellent mechanical and chemical resistance properties. Note de contenu : EXPERIMENTAL : Materials - Analysis of cardanol - Methods
CHARACTERIZATION OF CARDANOL-FURFURAL BASED NOVOLAC RESIN : Fourier-transform infrared (FTIR) spectroscopic analysis - H-NMR spectroscopic analysis - Differential scanning calorimetry (DSC) - Mechanical properties of the prepared films - Chemical resistance of the prepared films
RESULTS AND DISCUSSION : Analysis of cardanol - Synthesis of cardanol-furfural-based novolac resin - Evaluation of coating films for their curing characteristics - Fourier-transform infrared (FTIR) spectroscopic analysis - H-NMR spectroscopic analysis - Differential scanning calorimetric analysis for curing of FFNR - Mechanical properties of the prepared films - Chemical resistance of the prepared filmsDOI : 10.1007/s11998-014-9630-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9630-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23649
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Code-barres Cote Support Localisation Section Disponibilité 17119 - Périodique Bibliothèque principale Documentaires Disponible Studies on epoxy resin curatives and their applications / Garima Tripathi in PAINTINDIA, Vol. LVII, N° 5 (05/2007)
PermalinkStudies on the blends of epoxy and different liquid rubber / Ranjana Yadav in PAINTINDIA, Vol. LIX, N° 4 (04/2009)
PermalinkStudies on the extraction, modification and applications of CNSL/cardanol based epoxy resin / Ranjana Yadav in PAINTINDIA, Vol. LIX, N° 3 (03/2009)
PermalinkSynthesis and curing of cardanol-based vinyl ester resins for applications in surface coatings - I / Minakshi Sultania in PAINTINDIA, Vol. LIX, N° 12 (12/2009)
PermalinkVinyl ester resins and their blends for protective Coatings / Arun Maithani in PAINTINDIA, Vol. LVI, N° 10 (10/2006)
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