[article]
| Titre : |
Development of hyperbranched polyurethane coatings : effect of chain extender and NCO/OH ratio |
| Type de document : |
texte imprimé |
| Auteurs : |
Aswini K. Mishra, Auteur ; Ramanuj Narayan, Auteur ; K. V. S. N. Raju, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
p. 53-60 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse thermomécanique dynamique
Fourier, Spectroscopie infrarouge à transformée de
Polyesters
Polymères ramifiés
Polyuréthanes
Revêtements:Peinture
Thermogravimétrie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The present work describes the effect of chain extender and NCO/OH ratio on the properties of hyperbranched polyurethane-urea (HBPU-urea) and HBPU-imide coatings. For this initially, the "CO terminated prepolymers were prepared by reacting the 1st and 2nd, generation hyperbranched polyester polyols (HBP-G1 and HBP-G2) with excess diisocyanate. In the next step, the extra "CO content of the prepolymer was calculated and completely chain extended by different chain extenders such as 3-aminopropyl triethoxysilane (APTES), pyromelatic dianhydride (PMDA) and N-hydroxy phtallimide (NHTM) to get either the HBPU-urea or HBPU-imide coatings. The structure to property relation was studied by FT-IR peak deconvulation process while, their film properties were evaluated by TGA, DMTA, UTM and contact angle instruments. The FT-IR peak deconvolution result suggests highest amount of hydrogen bonding interaction in case of PMDA based coatings and this increases with increasing the NCO/OH ratio. The TGA, DMTA and UTM data supports to the FT-IR deconvolution results. The contact angle result suggests that the hydrophobicity of the coating increases with increasing the NCO/OH ratio. The adhesive strength, abrasion resistance, alkali resistance, and gel content of the various coatings were also evaluated. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Instrumental methods - Synthesis and film casting of HBPU-urea or HBPU-imide coatings
- RESULTS AND DISCUSSION : FT-IR analysis - Thermal analysis - Viscoelastic study - Tensile property and contact angle analysis - Solubility, adhesive strength and gel content study |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13821 |
in PAINTINDIA > Vol. LXI, N° 11 (11/2011) . - p. 53-60
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