Characterizations of Fluorine-Containing Polybenzoxazine Prepared by Solventless Procedure

Abstract:

A fluorine-containing benzoxazine monomer (BAF-4fa) from 4-(trifluoromethyl) aniline, 4,4′-(Hexafluoroisopropylidene) diphenol or bisphenol-AF and paraformaldehyde was synthesized using solventless method at temperature of 110°C without any catalyst. Chemical structure and thermal properties of as-synthesized benzoxazine resin were investigated and compared with fluorine-containing benzoxazine resin as well as with traditional bisphenol-A aniline based benzoxazine (BA-a) system. From Fourier transform infrared spectrum of BAF-4fa monomer, absorption band at 1243 cm^-1 which were assigned to C-O-C stretching mode of oxazine ring and band around 1505 cm^-1 and 951 cm^-1 which were attributed to tri-substitutued benzene ring from the oxazine ring moieties were observed. The result is in good agreement with the BA-a monomer, indicating successful preparation of BAF-4fa via solventless technology. The obtained BAF-4fa also exhibits thermal curing ability which is a signature of benzoxazine resin. The exothermic heat of reaction of BAF-4fa was found to be less than that of BA-a as observed by a differential scanning calorimeter. The BAF-4fa monomer was step-cured at 200°C for 2 hours, 250°C for 3 hours followed by 270°C for 2 hours to achieve its fully cured stage. Glass transition temperature of PBAF-4fa from tanδ of dynamic mechanical analysis was found to be much higher than that of PBA-a i.e. 288°C vs 189°C. From thermogravimetric analysis, thermal degradation at 10% weight loss of PBAF-4fa was found to be 453°C compared to the value of 341°C of PBA-a while the char yield was 53% vs 28% of the BA-a polymer. As a consequence, the incorporation of fluorine atoms into polybenzoxazine is able to improve various thermal stability of the polymer which allows such application as high temperature resistance materials including electronic packaging, thermal resistance coating.

• Periodical: Key Engineering Materials (Volume 659)
• Pages: 368-372
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.659.368
• Online since: August 2015
• Authors: Patcharat Pattharasiriwong, Sarawut Rimdusit*
• Keywords: Fluorine-Containing Polymer, FTIR, Polybenzoxazine, Thermal Property

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