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Polymers 2016, 8(3), 35;

The Effect of Introducing B and N on Pyrolysis Process of High Ortho Novolac Resin

Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Science and Technology on Combustion, Internal Flow and Thermal-Structure Laboratory, School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, China
Author to whom correspondence should be addressed.
Academic Editor: Antonio Pizzi
Received: 18 December 2015 / Revised: 17 January 2016 / Accepted: 22 January 2016 / Published: 24 February 2016
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In this contribution, high ortho novolac resins modified with phenylboronic acid were synthesized. The thermal stability of novolac resins cured with hexamethylenetetramine (HMTA) and chemical states of B and N via a pyrolysis process were studied. For the cured o-novolac modified with phenylboronic acid, the temperature with maximum decomposition rate increased by 43.5 °C, and the char yield increased by 5.3% at 800 °C compared with cured o-novolac. Density functional theory (DFT) calculations show the existence of hydrogen bonding between N of HMTA and H of phenol in modified resin. Thus, N could still be found at high temperature and C=N structure could be formed via a pyrolysis process. B2O3 was obtained at 400 °C by the cleavage of B–O–C and B–C bonds and it reduces the oxygen loss which may take part in the formation of carbon oxides in the system. The melting B2O3 on the surface of the resin will prevent small molecules and carbon oxides from releasing. Moreover, introducing B into the system helps to decrease the interlayer distance and improve graphite structures via a pyrolysis process. View Full-Text
Keywords: phenylboronic acid; novolac resin; thermal stability; chemical state phenylboronic acid; novolac resin; thermal stability; chemical state

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Yun, J.; Chen, L.; Zhang, X.; Feng, J.; Liu, L. The Effect of Introducing B and N on Pyrolysis Process of High Ortho Novolac Resin. Polymers 2016, 8, 35.

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