Curing reaction mechanism and heat resistance properties of hexa‐(4‐carboxyl‐phenoxy)‐cyclotriphosphazene/bisphenol A aniline benzoxazine blends

Abstract

A blend system of hexa‐(4‐carboxyl‐phenoxy)‐cyclotriphosphazene (HCPCP) and bisphenol A aniline benzoxazine (BA‐a) was prepared, and its curing reaction mechanism and heat resistance properties were studied. The curing reaction mechanism of the blend was explored by differential scanning calorimetry, Fourier transform infrared spectroscopy, and modeling software using model compounds Ar‐COOH and hexachlorocyclotriphosphazene (HCCP). The heat resistance properties of the cured blends were studied by thermogravimetric analysis and dynamic mechanical analysis. The polymerization of benzoxazine was catalyzed by HCPCP through phosphazene ring and acid groups, and phosphazene played a predominant role. Compared with the materials with a single functional group (Ar‐COOH and HCCP), HCPCP containing two functional groups (phosphazene ring and acid) exhibited weaker catalytic effects, mainly due to the high molecular weight of HCPCP obstructing movement and causing steric hindrance. In addition, HCPCP had a positive effect on the thermal stability of polybenzoxazine from 250 to 400 °C. When the HCPCP content reached 3%, the cured blend had the highest glass‐transition temperature (222.2 °C), which is higher by 20 °C than that of cured benzoxazine. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46389.

Design and Effects of the Cinnamic Acids Chemical Structures as Organocatalyst on the Polymerization of Benzoxazines

“…It has been reported that organic acids catalyze benzoxazine polymerization [ 17 ]. Most studies present the influence of acid/acidic catalysts as a function of concentration [ 11 , 16 , 17 , 32 , 33 , 34 , 35 ]. In this regard, Figure 3 a presents a similar study for the two cinnamic catalysts investigated in this work, where higher acid concentrations induce greater lowering of T p .…”

Manganese Cyclotriphosphazene Multicarboxylate Frameworks and Composite Encapsulated 1,3,6,8-Tetrakis(p-benzoic acid) Pyrene as Visualization of Highly Selective Fluorescence Sensors for Aromatic Compounds with NH2/NO2 Group

“…1,3,6,8-Tetrakis­( p -benzoic acid) pyrene (H 4 TBAPy) , and hexa-(4-carboxyl-phenoxy)-cyclotriphosphazene (HCPCP) were synthesized according to previous literature. The synthetic process of H 4 TBAPy and ligand HCPCP is shown in the Supporting Information.…”

Synthesis and Application of Arylaminophosphazene as a Flame Retardant and Catalyst for the Polymerization of Benzoxazines

“…A number of effective flame-retarded functional epoxy resins, amine curing agents and benzoxazines with a phosphazene core have been proposed [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Carboxyl-containing epoxyphosphazenes and their use as a catalyst for the polymerization of benzoxazines have also been reported [ 22 ].…”