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http://dx.doi.org/10.7473/EC.2011.46.4.295

Synthesis and Thermal Properties of Aromatic Polyhydroxyamides Containing Imide Ring in the Main Chain  

Wee, Doo-Young (Dept. of Polymer Science & Engineering, Chosun University)
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.46, no.4, 2011 , pp. 295-303 More about this Journal
Abstract
A series of new aromatic polyhydroxyamides (PHAs) containing imide ring were prepared by direct polycondensation reaction of imide-diacids and two types of bis(o-aminophenol)s including 3,3'-dihydroxybenzidine and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane. The polymers were characterized by FT-IR, FT-NMR, DSC and TGA. The inherent viscosities of the PHAs measured at $35^{\circ}C$ in DMAC solution were in the range of 0.49-1.13 dL/g. PHA 2 and 3, except PHA 1, were soluble in polar solvents such as DMAc, DMF and NMP. PHA 4, 5, and 6 containing 6F group showed a higher solubility in less polar solvents. But the polybenzoxazoles (PBOs,) were insoluble in a variety of solvents except partially soluble in sulfuric acid. The PBO 1, 2 and 3 showed maximum weight loss temperature in the range of $650-656^{\circ}C$ and relatively high char yields in the range of 57.4-61.9 % under a nitrogen atmosphere. These results suggested that the introduction of imide or diimide ring in the main chain was effective in improving the thermal stability of PHAs and PBOs.
Keywords
direct polycondensation; PHA; PBO; imide ring;
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