Academic Journal
Microwave‐assisted solvent‐free synthesis of novel benzoxazines: A faster and environmentally friendly route to the development of bio‐based thermosetting resins
| العنوان: | Microwave‐assisted solvent‐free synthesis of novel benzoxazines: A faster and environmentally friendly route to the development of bio‐based thermosetting resins |
|---|---|
| المؤلفون: | Oliveira, Jéssica R., Kotzebue, Lloyd R. V., Ribeiro, Francisco W. M., Mota, Beatriz C., Zampieri, Dávila, Mazzetto, Selma E., Ishida, Hatsuo, Lomonaco, Diego |
| المصدر: | Journal of Polymer Science Part A: Polymer Chemistry ; volume 55, issue 21, page 3534-3544 ; ISSN 0887-624X 1099-0518 |
| بيانات النشر: | Wiley |
| سنة النشر: | 2017 |
| المجموعة: | Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: | Microwave‐assisted organic synthesis (MAOS) is a well‐established technique that has been used in the enhancement of chemical reactions. Here, the versatility of MAOS is explored describing an environmentally friendly one‐pot route to novel bio‐based benzoxazines under solvent‐free conditions. The lignin derivative, guaiacol, along with paraformaldehyde and different conjugated and nonconjugated amines are successfully fused into guaiacol‐derived 3,4‐dihydro‐2 H ‐1,3‐benzoxazines. The reactions conducted under microwave irradiation are completed much faster than those under traditional heating, reducing the reaction time from hours to only 6 min, with good yields. The chemical structures of novel benzoxazines are confirmed by 1 H and 13 C NMR spectroscopy, FTIR, and HR‐MS. The thermal behavior of the resins are evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), showing that these polymers have good thermal stability and wide processing‐window, with onset temperature of polymerization above 230 °C. These results indicate dramatic improvement over the traditional methodologies for the production of this class of resins, which are usually obtained by time‐consuming procedures and in the presence of toxic solvents. Therefore, MAOS can be considered a green and efficient strategy for the synthesis of eco‐friendly benzoxazines. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3534–3544 |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1002/pola.28755 |
| الاتاحة: | http://dx.doi.org/10.1002/pola.28755 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fpola.28755 https://onlinelibrary.wiley.com/doi/pdf/10.1002/pola.28755 |
| Rights: | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| رقم الانضمام: | edsbas.96DB4CA9 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1002/pola.28755 |
|---|