Effect of hydrogen bonds on the modulus of bulk polybenzoxazines in the glassy state

Abstract

In this paper, the critical role of hydrogen bonds on the modulus of bulk polybenzoxazines in the glassy state was proved through introducing an additional hydrogen bond, C=O···HO, into the polybenzoxazine. Thorough studies were carried out to resolve the different modulus behaviors of polybenzoxazines with and without this additional hydrogen bond as the temperature increases. With the aid of dynamic mechanical analysis and in situ Fourier transform infrared spectroscopy, we found that the different performances in modulus were in accordance with the changes of C=O···HO and, therefore, revealed that the hydrogen bonds played a crucial role on the modulus of bulk polybenzoxazines in the glassy state. We believe this improved insight into the roles of hydrogen bonds is expected to help researchers explore novel polybenzoxazine resins with excellent thermal and mechanical properties.

Silane‐functional benzoxazine: synthesis, polymerization kinetics and thermal stability

“…These band assignments of a Schiff base have been previously reported and are assigned to a free Schiff base (C=N) . Meanwhile, the intensity of the signals at 3420 cm −1 corresponding to the intermolecular hydrogen bonding all increase along with the curing temperature …”

H-bonding supramolecular interactions driving the dispersion of kaolin into benzoxazine: A tool for the reinforcement of polybenzoxazines thermal and thermo-mechanical properties

“…These properties have been attributed to the unique hydrogen bonding structure found in these materials, therefore being the focus of recent investigations [2][3][4][5][6]. Thanks to these interactions, polybenzoxazines meet logically development in supramolecular chemistry, molecular nanotechnology and biotechnology [7][8][9].…”

Curing Reaction of Benzoxazine Under High Pressure and the Effect on Thermal Resistance of Polybenzoxazine

“…Taking bisphenol A/aniline type benzoxazine (BA‐a) as an example, its cross‐linking structures may contain phenolic Mannich bridge structure, arylamine Mannich bridge structure, and methylene bridge structure . Besides these basic covalent cross‐linking structures, there are many intramolecular and intermolecular hydrogen bonds in polybenzoxazine . These hydrogen bonds make polybenzoxazines possess good mechanical and heat‐resistant properties in spite of low cross‐linking density .…”

“…[7][8][9][10] Besides these basic covalent cross-linking structures, there are many intramolecular and intermolecular hydrogen bonds in polybenzoxazine. [11][12][13] These hydrogen bonds make polybenzoxazines possess good mechanical and heat-resistant properties in spite www.advancedsciencenews.com www.mcp-journal. de composites, but little is known about the effect of the pressure on its curing reaction.…”