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http://dx.doi.org/10.7473/EC.2012.47.4.355

Preparation and Flame Retardancy of Poly(benzoxazole imide) Having Trifluoromethyl Group in the Main Chain  

Yeom, Jin-Seok (Fuelcell Material Research Group, Korea Research Institute of Chemical Technology)
Choi, Jae-Kon (Dept. of Polymer Science & Engineering, Chosun University)
Lee, Chang-Hoon (Dept. of Polymer Science & Engineering, Chosun University)
Publication Information
Elastomers and Composites / v.47, no.4, 2012 , pp. 355-363 More about this Journal
Abstract
A series of poly(hydroxyamide)s (PHAs) having trifluoromethyl group were prepared by direct polycondensation of aromatic diimide-dicarboxylic acids with 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane by thionyl chloride and triethyl amine in N-methyl-2-pyrrolidinone (NMP). The PHAs exhibited inherent viscosity in the range of 0.54-0.96 dL/g at $35^{\circ}C$ in DMAc solution. All PHAs were readily soluble in a variety of organic solvents, whereas the polybenzoxazoles (PBOs) were quite insoluble except partially soluble in sulfuric acid. PHAs were converted to PBOs by thermal cycling reaction with heat of endotherm. The maximum weight loss temperature of the PHAs occurred in the range of $559-567^{\circ}C$. The PBOs showed relatively high char yields in the range of 47-59%. Pyrolysis Combustion Flow Calorimeter (PCFC) results of the PBOs showed 12-19 W/g heat release rate (HRR), and 2.7-3.6 kJ/g total heat release (total HR). The HRR of PBO 1 showed the lowest value of 12 W/g, which was 37% lower than that of PBO 3 (19 W/g).
Keywords
Flame retardancy; PBOs; PHAs; HRR;
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