Preparation and characterization of polybenzoxazine foam with flame retardancy

Abstract

Polybenzoxazine foam was successfully prepared using phenolic resin as modifier and catalyst. The structural properties, curing behavior, thermal stability, cellular structure, mechanical properties and flame retardancy properties of the foam were characterized by Fourier transform infrared (FTIR) spectrometry, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), compression tests, limiting oxygen index (LOI) tests and cone calorimetry test, respectively. The experimental results indicated that both phenolic resin and imidazole catalyzed the curing process of benzoxazine and that the curing temperature decreased obviously. The polybenzoxazine foam loaded with different contents of phenolic resin showed an isotropic cellular structure with relative densities ranging from 116 to 185 kg/m 3 , and the compressive strength and compressive modulus could reach as high as 0.512 and 7.21 MPa, respectively. In addition, the cone calorimeter test results showed that the average heat release rate (av-HRR), total heat release (THR) and total smoke production (TSP) of PBZ-7.5 reduced, which indicated that the polybenzoxazine has satisfactory flame retardancy with the addition of phenolic resin.

Microporous N- and O-Codoped Carbon Materials Derived from Benzoxazine for Supercapacitor Application

“…PBZ was prepared by the method developed in our previous work [42]. Briefly, 20 g benzoxazine powder was first mixed with 2 g imidazole.…”

“…In a previous work, we developed an effective method to prepare PBZ foam materials with a hierarchical pore structure from a very simple dimeric benzoxazine monomer derived from methylenedianiline [42]. Considering porous structure is favorable to achieve good capacitive performance for carbon materials, we are motivated to carbonize the obtained PBZ foam.…”

Intrinsically Noncombustible Thermosets from Sulfur-Containing Epoxy Resin and Benzoxazines: Evaluation of Thermal and Mechanical Properties

“…To address these problems, researchers have modified benzoxazine (BZ) resins using different methods, such as designing molecular structures by choosing particular phenols and amines [6][7][8][9], preparing composites with functional solid materials [10][11][12][13], and blending modification. The most common method is blending modification, which is usually achieved by adding rubber [14][15][16][17], polyurethane [18,19], phenolic resin [20], maleimide [21,22], and epoxy resin (EPS) [23]. The copolymerization products of this process usually exhibit superior properties to their parent substances.…”