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- 저자 : 오태진 (검색결과 95 건)
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카바모일기를 측좨로 갖는 방향족 폴리아미드의 합성 및 물성(I) -열적 및 화학적 처리에 의한 화학구조 변화-
오태진 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.4
We have successfully synthesized new aromatic polyamide having pendant amide group, i.e., aromatic poly(2,5-diaminobenzamide-terephthalamide) (PDB TA) and poly(diamino-carbamoylbenzanilide-terephthalamide) (poly(DACB-TPC)) by the low temperature solution polymerization of terephthaloyl chloride with aromatic amide diamines of 2,5-diamino-benzamide, 4,4'-diamino-6-carbamoylbenzanilide and 3,4'-diamino-6-carbamoylbenzan ilide . The changes of chemical structure along a polymer chain during thermal and chemical treatment were examined by FT-FR spectroscopy. The thermal cyclization of poly(2,5-dimino be n am ids-terephthalamide) (PDB TA) and poly(4,4'-diamino-6-carbamoylbenz anilide- terephthalamide) (poly(p-DAC B-TPC ) in the absence and in the presence of catalyst such as LiCl produces both quinazolone and benzoxazinone rings by dehydration and deamination respectively through condensation reaction of pendant carbamoyl group and amide. bond along a polymer chain. The chemical cyclization of PDBTA and polyp-DACB-TPC) in fuming H2SO4, on the contrary, produces nitril groups exclusively along a polymer chain via strong dehydration reaction of pendant carbamoyl group itself in fuming H2SO4.
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카바모일기를 측쇄로 갖는 방향족 폴리아미드의 합성 및 물성(III) -열적 및 기계적 성질-
오태진,김진사,이승조,O, Tae-Jin,Kim, Jin-Sa,Lee, Seung-Jo The Korean Fiber Society 1995 한국섬유공학회지 Vol.32 No.5
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.
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카바모일기를 측쇄로 갖는 방향족 폴리아미드의 합성 및 물성(ll) -모델 반응-
오태진,곽경진,서문호,O, Tae-Jin,Gwak, Gyeong-Jin,Seo, Mun-Ho 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.4
The changes of chemical structure along a polymer chain during thermal and chemical treatment were examined by FT-lR spenxoscopy. The thermal cyclization of poly(2,5-diaminobenzamide-terephthalamide) (PDBTA) and poly(4,4'-dia- vino-6-carbamoylbenzanilide-terephthalamide) (polyul-DACB -TPC)) in the absence and in the presence of catalyst such as LiCl produces both a large amount of quinazolone and a small a mount of benzoxazinone along a polymer chain; the amount of quinazolone and benzoxazinone formed by dehydration and deamination reaction through condensation reaction of pendant carbamoyl fyoup and amide bond along a polymer chain during thermal treatment of the polymer was determined using calibration curve obtained with the absorbance of model compounds of 6-benzoylamino-2-pheny1-4-(3H) -quinazolone and of 6-benzoylamino-2-phenyl-4H-3,1-benzoxazin-Lone measured at wavenumber of 1358 and 1742cm -1 It turns out that thermal cyclopolycondensation of PDBTA without LiCl at 270'I produces 76% of quinazolone and 24% of benzoxazione as well as with LiCl gives 89% and 11%, respectively. The chemin cyclization of PDBTA and poly(p-DACB-TPC) in fuming H2SO4, on the contrary, produces nitril groups exclusively along a polymer chain via strong dehydration reaction of carbamoyl groups along polymer chain in fuming H2SO4 ; it is confirmed by chemical treatment in fuming H2SO4 of model compound Rr, leis(2,5-N-benzoyldiamino) benzamide, which gives around 80% of bis(2,5-N-benzoyldiamino) benzonitrile, VII.
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오태진,나인채,안소정,김정한 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
(재)차세대수치예보모델개발사업단 (Korea Institute of Atmospheric Prediction Systems, KIAPS)에서는 능동형 수치예측체계 분석기술 개발의 일환으로 호우 발생 가능성에 대하여 사전 상황을 인지하여 예측 선행 시간별로 호우 예비특보 발표 가능성에 대한 의사결정을 지원하기 위해 크게 두가지 인공지능을 활용한 연구 개발을 진행하고 있다. 첫째는 수치 모델의 해상도가 높아짐에 따른 방대해지는 계산량을 정확하고 보다 효율적으로 처리하기 위해 기존 수치모델 물리 모수화 연산과정의 입출력 자료를 인공신경망으로 학습하여 기존 알고리즘을 대체하여 사용할 수 있는 에뮬레이터의 개발이다. 에뮬레이터는 미세물리과정을 시험적으로 개발, 적용하고 향후 물리 전과정에 대한 통합 에뮬레이터를 개발하여 모델 역학코어에 접합하여 운영할 계획이다. 물리과정 에뮬레이터는 역학코어와의 상호작용을 위한 모델 예단변수 예측뿐만 아니라 물리과정에서 계산되는 진단변수들도 처리하도록 설계하고 태양에너지 관련 천문 데이터 생성 모듈도 고려하여 개발할 계획이다. 둘째는 수치모델의 다양한 예측자료와 인공지능기법을 기반으로 호우예비특보 가능성에 대한 상황인지 시스템의 개발이다. 이를 위해서 우선 고해상도 재분석자료를 초기장으로 이용하여 과거 재현 예측체계를 개발하고, 이후 모델예측장과 관측 자료를 활용하여 인공지능 모델을 학습시키고자 한다. 과거 재현 예측체계로는 앞서 언급한 물리과정 에뮬레이터를 탑재한 수치모델이 활용될 것이며 재현된 학습자료를 기반으로 동아시아 및 한반도 지역을 중심으로 6시간, 12시간, 그리고 최종적으로 24시간 선행 도단위 호우예비특보 상황인지 예측 시스템을 구축할 계획이다.
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오태진,장용석 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.3
In-situ polymerized anisotropic spinning solution of poly(DACYB/TPC) was prepared by low temperature solution polymerization of DACYB and TPC in N-methyl pyrrolidone with addition of equimolar amount of $Li_2CO_3$, which was directly dry-jet wet spun to give high strength (higher than 20 g/d) and high modulus (higher than 720 g/d) aromatic polyamide fiber. Mechanical properties of the fiber was strongly dependent on the dry-jet wet spinning conditions, i.e., spinneret diameter, spin draw ratio, air gap and heat treatment conditions (temperature and tension). Poly(DACYB/TPC) fiber spun through spinning holes with diameter 0.06 mm had higher tensile property than the fiber spun with diameter 0.15 mm at the same spin draw ratio, The latter, however, had higher tensile property than the former at the identical fiber thickness. Fibers prepared by dry-jet wet spinning through the air gap of around 40 mm gave the best properties by enhancing spin draw ratio. Heat treatment (above 25$0^{\circ}C$) under tension (higher than 2 g/d) improved the tensile property of poly(DACYB/TPC) fiber, particularly in tensile modulus.
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