| Full text | |
| Author(s): |
Nardeli, Jessica Verger
[1]
;
Fugivara, Cecilio Sadao
[1]
;
Pereira Pinto, Elaine Ruzgus
[2]
;
Polito, Wagner Luiz
[2]
;
Messaddeq, Younes
[2]
;
Lima Ribeiro, Sidney Jose
[2]
;
Benedetti, Assis Vicente
[1]
Total Authors: 7
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Inst Chem, Dept Phys Chem, POB 355, BR-14801970 Araraquara, SP - Brazil
[2] Sao Paulo State Univ UNESP, Inst Chem, Dept Gen & Inorgan Chem, POB 355, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | POLYMERS; v. 11, n. 11 NOV 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
Resins of polyurethane were prepared from vegetable oils (crambe and castor) and modified by adding green corrosion inhibitor (condensed tannin). The oils were characterized by gas chromatography with flame-ionization detection (GC-FID), attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR) and thermogravimetric analysis (TGA). The reaction was monitored by characterizing the intermediate products (polyester and prepolymer). The polyester was characterized by solubility in methanol, acidity index, hydroxyl groups and FTIR-ATR, and the prepolymer was characterized by solid content, solvent content, isocyanate (NCO) groups and FTIR-ATR. The formation of PU resins was confirmed by FTIR-ATR and TGA, and the presence of tannin particles incorporated in the coating can be observed by optical microscopy (OM). The absence of the band attributed to NCO in FTIR-ATR spectra of the resins confirmed the complete reaction between polyester and prepolymer. The OM observation and a video demonstrate that Polyurethane (PU)-modified with condensed tannin resin presents self-healing effect, probably through the formation of new hydrogen bonds when in contact with deionized water. Therefore, these results open possibilities for new synthetic routes aiming at improving the very important self-healing property for protecting metals and their alloys against corrosion, extending significantly the metallic materials lifetime as previously demonstrated by our group. (AU) | |
| FAPESP's process: | 18/09040-9 - Evaluation of the self-healing properties of polyurethane coatings derived from vegetable oils with and without addition of corrosion inhibitors using localized electrochemical techniques and the study of chemical and structural properties. |
| Grantee: | Jéssica Verger Nardeli |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 15/10554-9 - Polyurethanes Coatings derived from vegetable oil with and without addition of corrosion inhibitors: chemical, structural and corrosion resistance. |
| Grantee: | Jéssica Verger Nardeli |
| Support Opportunities: | Scholarships in Brazil - Doctorate |