| 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
Revêtements
|
| Index. 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 resistance |
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in PAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 85-100
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