http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Synthesis of Photosensitive Polyimide for Semiconductor Using o-Nitrobenzyl Ether Group
송광식,허윤정,백정주,박성만,김영랑,장기철,김영훈,이효선,배근열,최경호,신교직 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Aromatic polyimide is a kind of excellent high performance polymer having thermal resistance and chemical resistance to radiation. Besides, since it has a relatively low dielectric constant and excellent mechanical properties, it is widely used in the space industry and semiconductor industry. Therefore a large molecular weight and flexibility has been required to improve physical properties of PI such as elongation rate. In this study, we synthesized dianhydride having a hydroxyl functional group in the molecular structure and three kinds of aromatic ethylene diamines to improve flexibility of the PI film. And then polymerization was performed using DHBA and various kinds of synthesized monomers. After polymerization, o-nitrobenzyl bromide was substituted to the hydroxyl group of the polymer to synthesize photosensitive polyimide. The structure of the polymerized PSPI was analyzed by NMR and FT-IR. Thermal stability was also evaluated by TGA.
임신 후반기에 진단된 쿠싱 증후근 산모에서 미숙아 분만후 부신적출술을 경험한 1 예
송광식,이기영,송석호,양달모,강문호,김홍규,황재경,주기탁,이항진,서찬종,박혜영,오영하 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.1
We experienced a case of Cushing's syndrome due to adrenocortical adenoma associated with 3lth week (third trimester) pregnancy in a 29 year-old female patient. The patient complained of generalized weakness, fatigue, and febrile sensation. On physical examinations, hypertension, moon face, plethoric face, abdominal striae, and scattered petechiae were found. Laboratory findings showed increased serum cortisol (AM 8:00.8 pg/dL, PM 1l:0054.9 pg/dL), increased 24 hours-urinary free cortisol (1,598 pg/day), and decreased plasma ACTH (AM 8:00.41 pg/mL, PM 11:005.66 pg/mL) and not suppressed high dose dexamethasone suppression test. Abdominal MRI demonstrated 3?4 cm sized well marginated and round shaped left adrenal mass. At the 31th week of pregnancy, unexpectedly ruptured membrane was developed. She delivered baby weigting 1.3 kg through induction vaginal delivery. Unilateral adrenalectomy was performed after delivery and the mass was canfirmed to be benign adrenal adenoma. Steroid replacement therapy was contnued with 5mg prednisolone after left adrenalectomy. After unilateral adrenalectomy and conservative management, her symptoms was improved gradually (J Kor Soc Endocrinol 16:134-139, 2001).
The synthesis of photosensitive polyimide using various groups for application of semiconductors
송광식,김영랑,김영훈,박성만,허윤정,백정주,장기철,이효선,배근열,최경호,신교직 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Aromatic polyimide (PI) is a kind of excellent high performance polymer having thermal resistance and chemical resistance to radiation. Besides, since it has a relatively low dielectric constant and excellent mechanical properties, it is widely used in the space industry and semiconductor industry. Therefore a large molecular weight and flexibility has been required to improve physical properties of PI such as elongation rate. In this study, we synthesized DHBA having a hydroxyl functional group in the molecular structure and three kinds of aromatic ethylene diamines to improve flexibility of the PI film. And then polymerization was performed using DHBA and various kinds of synthesized monomers. After polymerization, Di-tert-butyl dicarbonate, 2-Nitrobenzyl bromide was substituted to the hydroxyl group of the polymer to synthesize photosensitive polyimide. The structure of the polymerized PSPI was analyzed by NMR and FT-IR. Thermal stability was also evaluated by TGA.