Synthesis of high performance polybenzoxazine networks from bio-based furfurylamine: Furan vs benzene ring

Synthesis and properties of a novel bio‐based benzoxazine resin with excellent low‐temperature curing ability

“…Furfurylamine (F) is a commonly used fine chemical raw material produced from plant materials such as corn cob, straw and bagasse, and has an additional polymerizable site in the benzoxazine resin. It can undergo electrophilic aromatic substitution and participate in the polymerization reaction, which could increase the crosslinking density of the cured resin, thereby effectively improving the thermal stability of benzoxazine resin …”

Biobased Benzoxazine Derived from Daidzein and Furfurylamine: Microwave‐Assisted Synthesis and Thermal Properties Investigation

“…The E' of p(Dz-f) at 25 8Cw as found to be 2794 MPa and along with the temperature, it was decreased slightly,f rom 2518 MPa at 200 8Ct o2 015 MPa at 300 8C. [57] For extensive comparison and easy identification, the polybenzoxazines simultaneously possessing high thermal stabilitya nd T g values [9,21,31,34,39,54,58] are collected in Figure 11.T he outstanding thermalp roperties of p(Dz-f) is evident. This result might correspond to the high crosslinkd ensity and stiff molecular structure of p(Dz-f).…”

“…As shown in Figure 5, there was as harp endothermic peak that appeared at 164 8Cd uring the scan (black line), which was undoubtedly caused by the melting of Dz-f and this very sharp peak indicated its high-purity.Inaddition, the less high melting point of 164 8Cm ight endow Dz-f with good processability, which was investigated in the following part. [26,54] The exothermic enthalpy of Dz-f was approximated as 358.5 Jg À1 (88.9 kJ mol À1 ). Usually,t he peak temperaturei nt he DSC exothermic curve is taken as an indicatort oe valuate the curing reactivity.T he lower the temperature of the peak, the highert he reactivity of the system.…”

“…[54] For the Kissinger's equation, it can be expressed as: [54] For the Kissinger's equation, it can be expressed as:…”

“…The relativelyl ower polymerization temperature of Dz-f might be due to the "cooperativea ctivation effect" of benzopyrone and furan, which was also reported in previous work. [26,54] The exothermic enthalpy of Dz-f was approximated as 358.5 Jg À1 (88.9 kJ mol À1 ). This was slightly highert han the widely accepted enthalpyv alues for oxazine ring-opening polymerization.…”