에테르 연결기를 포함하는 방향족 Poly(hydroxyamide)s의 합성 및 특성

Abstract

A sereis of polyhydroxyamides(PHAs), having ether linkages in the polymer backbone were prepared via solution polycondensation at low temperature. The PHAs except for the PHA 4 exhibited inherent viscosities in the range of 0.5~1.1 dL/g at 35℃ in DMAc solution. This precursor polymers were studies by FT-IR, 1H-NMR, DSC, TGA, XRD and PCFC. Most of the PHAs except for the PHA 4 were soluble in polar organic solvents such as N,N-dimethylacetamide(DMAc), N-methyl-2-pyrrolidone(NMP), and N,N- dimethylformaide(DMF). Subsequent thermal treatment of the PHAs afforded poly- benzoxazols(PBOs). However, the PBOs were nearly insoluble in variety of organic solvent. Most of the PBOs except for the PBO 4 showed glass-transition temperature(Tg) in the range of 200~246 ℃ by DSC and maximum weight loss temperature in the range of 596~697 ℃ in nitrogen by TGA. PCFC results showed the heat release (HR) capacity 8.4~83 J/gK and total heat release (total HR) 2.4~5.5 kJ/g. Theses results showed more low flammability than PE, PC, PEEK, and Kevlar.