Characterization of Boron Modified Phenolic Resin and its Curing Behavior

Abstract

Boron modified phenolic (BPF) resins with different boron amounts were synthesized with a special synthesis technology. The structure of BPF resin was analyzed by Fourier transform infrared spectra (FTIR) and its curing behavior was analyzed by differential scanning calorimeter (DSC). The results showed that boric acid reacted with the hydroxyl groups in phenolic resin to form a new cross-linked bond such as B-O. At the same time, the heat resistance of BPF resin was improved about 18% with addition of boric acid of 0.8wt%. The obtained BPF had a high curing temperature of 254.6when the boric acid amount was 0.8wt%.

Guanosine Borate Hydrogel and Self-Assembled Nanostructures Capable of Enantioselective Aldol Reaction in Water

“…The characteristic bands at 1419 and 1334 cm −1 were assigned to the ν(B−OH) vibrations. 33,34 For the assembly solution stabilized by Na + (1-Na + ), the significantly reduced ν(B−OH) signals suggested the formation of 2. The retained signal at 1692 cm −1 implied the free amides abound in 1-Na + , while the H-bonding in hydrogel 1 impaired the amide vibration.…”

Decomposition mechanism of boron phenolic resin composites under temperature gradient

“…In DSC curve, the temperature of 1100°C is the turning point, since the reaction system below 1100°C was the exothermic system, which is due to the exothermic oxidation of resin matrix. The phenolic resin system disintegrates and all chemical bonds included are almost broken, meanwhile, pyrolytic substance spills out in the form of small molecules [12]. The decomposition process reaches the exothermic peak at 500.3°C, which is exactly the scope of pyrolysis temperature of BPR [34, 35].…”

“…The material that resists heat by surface erosion and mass loss is ablative material [8][9][10]. Phenolic resin has been the main matrix for ablative material owning to its brilliant mechanical properties, high residual rate and excellent heat resistance [11,12]. As a consequence, phenolic resin represents the ideal matrix of ablative material [13,14].…”

Research Progress in Boron-Modified Phenolic Resin and Its Composites

“…The thermal decomposition temperature of phenolic resin modified with para-substituted phenol-dominated alkylphenol and boric acid is 449 • C, which is between those of 2123 phenolic resin and bisphenol A type BPF or phenol type BPF [94]. The presence of the para-long chain of alkylphenol improves the flexibility of the resin but makes the resin molecule partially linear rather than bulk, and the reaction rate (relative activity) of the alkylphenol is low, resulting in a decrease in the heat resistance of the resin [95].…”

“…The orthogonal test determines the optimal synthesis process of BPF, and the reaction temperature of the second step is 100 • C. The reaction time is 3 h, the amount of boric acid is 7%, and the aldehyde to phenol molar ratio is 1.4. The best synthesis process of boron-and molybdenum-modified phenolic resin is when the reaction temperature of the second step is 105 • C, the reaction time is 2 h, the amount of ammonium molybdate is 4%, the amount of boric acid is 5%, and the molar ratio of aldehyde to phenol is 1.2 [11,94]. After the BPF prepared under the optimum synthesis conditions is heated in a muffle furnace at 800 • C for 7 min, its residual carbon rate is 62.13%, and the thermogravimetric analysis in an air atmosphere shows that its residual carbon rate at 600 • C is 79.7%.…”