Low-Temperature Terpolymerizable Benzoxazine Monomer Bearing Norbornene and Furan Groups: Synthesis, Characterization, Polymerization, and Properties of Its Polymer

There is an urgency to produce novel high-performance resins to support the rapid development of the aerospace field and the electronic industry. In the present work, we designed and consequently synthesized a benzoxazine monomer (oHPNI-fa) bearing both norbornene and furan groups through the flexible benzoxazine structural design capability. The molecular structure of oHPNI-fa was verified by the combination characterization of nuclear magnetic resonance spectrum, FT-IR technology, and high-resolution mass spectrum. The thermally activated terpolymerization was monitored by in situ FT-IR as well as differential scanning calorimetry (DSC). Moreover, the low-temperature-curing characteristics of oHPNI-fa have also been revealed and discussed in the current study. Furthermore, the curing kinetics of the oHPNI-fa were investigated by the Kissinger and Ozawa methods. The resulting highly cross-linked thermoset based on oHPNI-fa showed excellent thermal stability as well as flame retardancy (T-d10 of 425 ?, THR of 4.9 KJg(-1)). The strategy for molecular design utilized in the current work gives a guide to the development of high-performance resins which can potentially be applied in the aerospace and electronics industries.

Automated summary

In this study, a benzoxazine monomer (oHPNI-fa) with both norbornene and furan groups was designed and synthesized to meet the urgent need for novel high-performance resins in the aerospace and electronics industries. The molecular structure of oHPNI-fa was verified through various characterization techniques. The thermally activated terpolymerization of oHPNI-fa was monitored and its low-temperature-curing characteristics were revealed and discussed. The resulting highly cross-linked thermoset based on oHPNI-fa exhibited excellent thermal stability and flame retardancy. The molecular design strategy used in this study provides a guide for the development of high-performance resins for aerospace and electronics applications.