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Syntheses and Characterization of PBO Precursors Containing Dimethylphenoxy and/or MPEG Pendant Groups  

Yoon Doo-Soo (Department of Polymer Science & Engineering, Chosun University)
Choi Jae-Kon (Department of Polymer Science & Engineering, Chosun University)
Jo Byung-Wook (Department of Chemical Engineering, Chosun University)
Publication Information
Polymer(Korea) / v.29, no.5, 2005 , pp. 493-500 More about this Journal
Abstract
Polyhydroxyamides(PHAs) having poly(ethylene glycol)methyl ether (MPEG) and/or dimethylphenoxy pendant groups were synthesized by solution polycondensation at low temperature. The inherent viscosities of the PHAs measured at $35^{\circ}C$ in DMAC or DMAc/LiCl solution were in the range of $0.51\~2.31dL/g$. This precursor polymers were studied by FT-IR, $1H-NMR$, DSC, and TGA. Solubility of the precursors with higher MPEG unit was increased, especially the polymer having MPEG $(M_n=1100)$ was soluble or partially soluble in ethanol, methanol, and water as well as aprotic solvents, but the PBOs were nearly insoluble in a variety of solvents. PHAs were converted to polybenzoxazoles (PBOs) by thermal cyclization reaction with heat of endotherm. In case of the precursors having MPEG nit, the precursor polymers with a higher $M_n$ were fully cyclized at a lower temperature than one with a lower $M_n$.
Keywords
polyhydroxyamides; polybenzoxazoles; thermal cyclization reaction.;
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