Abstract
A kind of highly thermally stable polybenzoxazine prepared from the monomer bearing both acetenyl and aldehyde groups was treated at different temperatures till 1000 °C. The evolution of the chemical structures of the products during the heat treatment process was studied by FTIR, EA, XRD, XPS and Raman spectroscopy. It is learned that the pyrolysis process dominates below 600 °C while the carbonization plays a leading role when the temperature rises above 800 °C. Polybenzoxazine can rapidly carbonize and form N-containing heterocyclic structures such as pyridine, pyridinium and O-containing structures like cyclic ketones and ether groups at high temperatures (>800 °C). The resultant carbonaceous material treated at 1000 °C shows the electrical conductivity as high as 2.36 S/m, which is nine orders of magnitude higher than that of polybenzoxazine. Consequently, a 1 mm thick carbonaceous material shows an electromagnetic interference shielding effectiveness (EMI SE) more than 24 dB over the range of X-band, which means 93.7% of incident electromagnetic energy can be blocked.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
