5001-26-3Relevant articles and documents
Formaldehyde-Free Polybenzoxazines for High Performance Thermosets
Tavernier, Romain,Granado, Lérys,Foyer, Gabriel,David, Ghislain,Caillol, Sylvain
, p. 2557 - 2567 (2020)
We report the synthesis and ring-opening polymerization of new formaldehyde-free benzoxazines. The polybenzoxazines obtained displayed high thermal stability and high char yields. Data from the literature combined with our analyses by differential scanning calorimetry and thermogravimetric analyses gave deeper understanding about the use of aromatic aldehydes instead of formaldehyde for the generation of polybenzoxazines. Using pyrolysis coupled with gas chromatography/mass spectrometry (Py-GC/MS) at different temperatures, we provided qualitative data to propose some polymerization and degradation mechanisms associated with these new structures. A dialdehyde was also used for the first time in order to obtain difunctional monomers, instead of using diamines or bisphenols. Interestingly, we demonstrated that formaldehyde, which is a CMR (carcinogenic, mutagenic, and/or reprotoxic) substance, could be avoided for the synthesis of polybenzoxazines without any loss of thermal performance. Finally, some interesting structure-properties relationships are herein discussed. In particular, the use of benzyl amines, rather than aromatic amines, was found to significantly increase the char yields.
Screening of simple carbohydrates as a renewable organocatalyst for the efficient construction of 1,3-benzoxazine scaffold
Y?ld?r?m, Ayhan,Kaya, Yunus,G?ker, Mustafa
, (2021/10/12)
A convenient protocol for the two component preparation of 1,3-benzoxazines by using several protected and unprotected carbohydrate molecules as organocatalysts have been developed which is broadly applicable to condensation reaction between variety of Ma
Chemical design and synthesis of unsymmetrical diamino proligands employing a flexible route
Ledesma, Gabriela N.,Signorella, Sandra R.
, p. 5699 - 5702 (2012/10/30)
Three new unsymmetrical diamino proligands with a central alcohol group and four different pendant arms were obtained, employing a five step synthesis. The synthesis of these compounds involves inexpensive and commercially available reagents. The versatility of the synthetic route allows accessing to compartmental diamines with two chemically different adjacent coordination chambers.
