Synthesis and Properties of Aromatic Polyamides Having Pendant Carbamoyl group(III) -Thermal and Mechanical Properties-

카바모일기를 측쇄로 갖는 방향족 폴리아미드의 합성 및 물성(III) -열적 및 기계적 성질-

The thermal stability of poly(2,5-diaminobenzamide-terephthalamideXPDB TA) and poly(4,4'-diaminocarbamoylbe- nzanilide-te.ephthalamide) poly(PDACB -TPC ) was comparable with that of poly(p-phenyleneterephthalamideXPPTA) ; The PDBTA was decomposed with slower rate and Save higher residue than PPTA. The onset temperature of decomposition of heat-treated PDBTA and poly(PDACB-TPC) as well as chemically treated(with fuming sulfuric acid) polyp-DACB-TPC) shows 520℃, 517℃ and 514℃ measured by TGA under nitrogen atmosphere with rate of 10℃/min respectively. Tensile measurement of undrawn PDBTA films heat-treated at 200℃ and 300℃, respectively, for 1 hour gives around 25kg/mm2 (250MPa) of tensile strength and 900kg/mm2(gGPa) of tensile modulus, and that of wet-drawn PDBTA films(0.7 times in machine direction) shows around 52kg/mm2(510MPa) of tensile strength and around 2500kg1mm2(250pa) of tensile modulus. Tensile properties of poly(PDACB-TPC) film prepared by using hanger type coater are superior to that obtained by casting on the 섭ass plate. The tensile properties increase with increasing draw ratio. Tensile measurement of wet-drawn poly(p DACB-TPC) fims(0.5 times in machine direction) prepared by using hanger type coater Bives around 56∼62kg/mm2(550∼608MPa) of tensile strength and around 2565kg/mm2(220pa) of tensile modulus. Dynamic mechanical measurements carried out by Rheovibron at 110Hz of both undrawn and wet-drawn PDBTA as well as poly(p-DACB-TPC) films treated at 300℃ for 1 hour represent that the aromatic polyamide film retains outstanding mechanical properties even at 400℃. The crystallinity of polyamide films was investigated by X-ray difaactovam obtained by reflection method using nickel filtered CuKa radiation, indicating that the polymer has low degree of crystallinity.