Studies on new type of phenolic resin (IX) curing reaction of bisphenol A-based benzoxazine with bisoxazoline and the properties of the cured resin. II. Cure reactivity of benzoxazine

Abstract

Bisphenol A‐based benzoxazine that contained oligomers (oligo‐Ba) was prepared from bisphenol A, formaline, and aniline. Curing reaction of oligo‐Ba with bisoxazoline and the properties of the cured resin were investigated. Consequently, the ring‐opening reaction of benzoxazine ring occurred, and then the phenolic hydoroxyl group generated by the ring‐opening reaction of benzoxazine ring reacted with oxazoline ring. It was found that the cure induction time and cure time of the molten mixture from oligo‐Ba and bisoxazoline could be reduced and also the cure temperature could be lowered, compared with those from bisphenol A‐based benzoxazine, which contained no oligomers (Ba), and bisoxazoline. The melt viscosity of the molten mixture from oligo‐Ba and bisoxazoline was kept 0.1–10 [Pas] at 140°C even after 40 min, the molten mixture from oligo‐Ba and bisoxazoline showed good flowability below 140°C as well as that from Ba and bisoxazoline. However, above 160°C the curing reaction of oligo‐Ba with bisoxazoline proceeded more rapidly than that of Ba with bisoxazoline. The cured resin from oligo‐Ba and bisoxazoline showed good heat resistance and water resistance, compared with the cured resin from Ba and bisoxazoline. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 2331–2339, 2001

Examining the influence of bisphenol A on the polymerisation and network properties of an aromatic benzoxazine

“…Bisoxazolines are less common in this context 23 , although they have a longer history in the modification of phenolics 24 , conferring lower heat and smoke release properties. The formation of BA-a nanocomposites based on silica 25 and various silicate clay species 26,27,28,29 has been explored and improvements in thermal and mechanical properties can be realized with comparatively modest loadings.…”

Polyhedral Oligomeric Silsesquioxane (POSS) Nanoscale Reinforcement of Thermosetting Resin from Benzoxazine and Bisoxazoline

“…[21] As such, bisoxazolines can be used as the chain extender or crosslinking agent of the polymer. [22] Kimura et al [23,24] reported that the incorporation of bisoxazoline into bisphenol A-based BZ decreased the melt viscosity of the system, and the oxazoline ring could react with the phenolic hydroxy group generated by the ring opening of BZ. Therefore, in our study, the compatibility and reactivity between octaaminophenyl polyhedral oligomeric silsesquioxane (OAPS) and 2,2 0 -(1,3-phenylene)-bis(4,5-dihydro-oxazoles) (PBO) were confirmed.…”

Performance of graphite filled composite based on benzoxazine resin

“…Furthermore, this benzoxazine based resin does not need strong acids catalysts for curing, and does not produce by‐products during curing reaction 9. We also have already investigated the curing behavior of the bisphenol‐A, terpenediphenol, or poly( p‐ vinylphenol)‐based benzoxazines with epoxy resin or bisoxazoline and the properties of the cured resins 10–14…”