Effects of aromatic diboronic acid on thermal charateristics of polybenzoxazines based on phenol and aniline

Date

2018-11-01

Author

Telli, Aysegul Hisar
Hacaloğlu, Jale

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

259
views

0
downloads

In this work, polybenzoxazines based on phenol and aniline were prepared by curing as-synthesized and purified monomers in the presence of aromatic diboronic acid, BDBA. Condensation reactions between BOH groups of diboronic acid and phenolic OH groups of benzoxazine took place during curing only when unreacted phenol, or low mass oligomers were present in the medium. Generation of fragments involving B-O-C groups and significant improvement in thermal characteristics were detected upon curing the as-synthesized monomer in the presence of even 5 wt %BDBA. On the other hand, enhancement in thermal characteristics was not detected for the polybenzoxazine prepared by curing the purified monomer, when the wt % of BDBA was lower than 15%.

Subject Keywords

Polybenzoxazine, Aromatic diboronic acid, Thermal degradation, Direct pyrolysis mass spectrometry

URI

https://hdl.handle.net/11511/31947

Journal

EUROPEAN POLYMER JOURNAL

DOI

https://doi.org/10.1016/j.eurpolymj.2018.08.053

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

The effect of aromatic diboronic acid on characteristics of polybenzoxazine based on phenol and 4-aminomethylbenzoate İPEK, HALİL; Hacaloğlu, Jale (2018-11-23) In this study, a polybenzoxazine, (PPab) based on phenol and 4-aminomethyl benzoate and its composites containing various amounts of 1,4-benzene diboronic acid, (BDBA) were synthesized by stepwise curing. It has been determined that both thermal stability and char yield were increased as the amount of BDBA incorporated was increased. The improvements in thermal characteristics were associated with condensation reactions of B-OH of BDBA and not only with hydroxyl groups of polybenzoxazine but also ester grou...
The effect of 3-hydroxyphenylboronic acid on thermal characteristics of polybenzoxazine based on phenol and 4-aminomethylbenzoate Ipek, Halil; Hacaloğlu, Jale (2020-07-01) In this study, a polybenzoxazine, (PPab) based on phenol and 4-aminomethyl benzoate and its composites containing various amounts of 3-hydroxyphenylboronic acid, (HB) were prepared by stepwise curing. It has been found that thermal properties of composites were improved as the amount of HB introduced was increased. The improvements in thermal characteristics were associated with condensation reactions of hydroxyl groups of polybenzoxazine and ester groups on the aniline linkages yielding a highly cross-link...
Synthesis and analysis of thermal characteristics of polybenzoxazine based on phenol and 3-Amino phenyl boronic acid İPEK, HALİL; Hacaloğlu, Jale (2019-07-12) In this work, 3-amino phenyl boronic acid (AB) was used as an aniline derivative in the preparation of polybenzoxazine based on phenol. In order to investigate the effect of boronic acid on thermal characteristics, polybenzoxazines based on pure aniline and 50% aniline and AB mixture were also prepared and analyzed. Significant improvements in thermal characteristics, increase in thermal stability and char yield, was recorded for the polymers based on AB or its mixture. This behavior was associated with cro...
The use of pyrolysis mass spectrometry to investigate polymerization and degradation processes of methyl amine-based benzoxazine Bagherifam, Shahla; Uyar, Tamer; Ishida, Hatsuo; Hacaloğlu, Jale (2010-06-01) In this study, direct pyrolysis mass spectrometry, DP-MS, was applied to investigate curing and polymerization mechanisms of phenol and methyl amine-based benzoxazine monomer, and thermal decomposition and crosslinking characteristics of the corresponding polybenzoxazine. The results indicated opposing polymerization reaction routes besides the generally accepted one. The cleavage of C-O bonds of the oxazine rings either followed by transformation into a polymer constituting ortho or para substituted phenol...
Investigation of the effect of substituent on the growth of polymer for 3-substituted polythiophenes via pyrolysis mass spectrometry Aslan, Evren; Toppare, Levent Kamil; Hacaloğlu, Jale (2005-10-15) In this study, direct pyrolysis mass spectrometry analyses of electrochemically polymerized poly(decanedioic acid bis-(2-thiophen-3-yl-ethyl)ester) and poly(terepthalic acid bis-(2-thiophen-3-yl-ethyl)ester) were per-formed to investigate structural and thermal characteristics. It was found that when the ester linkages contain hydrocarbon chains, the growth of polymer occurred through both 2- and 5-positions. On the other hand, when the ester linkages contain more rigid groups such as phenyl, steric hindran...

Citation Formats

A. H. Telli and J. Hacaloğlu, “Effects of aromatic diboronic acid on thermal charateristics of polybenzoxazines based on phenol and aniline,” EUROPEAN POLYMER JOURNAL, pp. 182–190, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31947.