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http://dx.doi.org/10.5762/KAIS.2013.14.5.2550

Synthesis and Properties of Polybenzoxazole Precursors having Oligo(oxy ethylene) pendant  

Lee, Eung-Jae (Dept. of Bioenvironmental & Chemical Engineering, Chosun College University of Science & Technology)
Yoon, Doo-Soo (Dept. of Bioenvironmental & Chemical Engineering, Chosun College University of Science & Technology)
Bang, Moon-Soo (Division of Advanced Materials Science & Engineering, Kongju National University)
Choi, Jae-Kon (Dept. of Polymer Science & Engineering, Chosun University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.14, no.5, 2013 , pp. 2550-2558 More about this Journal
Abstract
Poly(o-hydroxyamides)(PHAs) copolymers having oligo(oxy ethylene) pendant in the main chain were synthesized by solution polycondensation reaction at low temperature. Copolymer precursors were studied by fourier transform infrared(FT-IR), differential scanning calorimeter(DSC), thermogravimetric analyzer(TGA), universal testing machine(UTM) and limited oxygen index(LOI). The inherent viscosities of the PHAs measured at $35^{\circ}C$ in DMAc or DMAc/LiCl solution were in the range of 0.74~1.42 dL/g. Solubility of the precursors with higher oligo(oxy ethylene) unit was increased, but the PBOs were nearly insoluble in a variety of solvents. The degradation temperature of the copolymer precursors was recorded in the ranges of $408{\sim}664^{\circ}C$ in nitrogen and char yields showed 13~59% values at $900^{\circ}C$. The mechanical properties and flame retardancy of copolymer precursors decreased with higher oligo(oxy ethylene) unit.
Keywords
Polybenzoxazoles; Poly(o-hydroxyamide)s; Thermal cyclization reaction;
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Times Cited By KSCI : 5  (Citation Analysis)
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