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Bis-(4-aminophenyl)phthalate과 4,4‘-hexafluoroisopropylidene phthalicdianhydride을 사용한 폴리이미드의 합성
안병현,김재일 한국화상학회 2016 한국화상학회지 Vol.22 No.4
프탈산염화물 또는 테레프탈산염화물과 4-니트로페놀로 부터 ortho 및 para catenation을 갖는 방향족 디아 민을 합성하였다. 이 방향족 디아민을 4,4‘-hexafluoroisopropylidenediphthalic anhydride (6FDA)와 반응시켜 폴리이미 드산을 합성하고, 이를 화학적으로 이미드화하여 폴리이미드를 얻었다. 얻어진 폴리이미드는 N-methyl-2-pyrrolidone (NMP)에 용해되었으며, 유연하고 질긴 필름으로 캐스팅 되었다. 폴리이미드의 5% 중량 감소는 440 ℃와 525 ℃에서 관찰되어 높은 열 안정성을 가짐을 확인할 수 있었다. Aromatic diamines containing ortho or papa catenation were synthesized from phthaloyl chloride or terephthaloyl chloride and 4-nitrophenol. The reaction of the aromatic diamines with 4,4‘-hexafluoroisopropylidenediphthalic anhydride (6FDA) gave poly(amic acid)s and they were imidized by chemical method. The polyimides are soluble in N-methyl-2-pyrrolidone (NMP) and can be cast into flexible and tough film. The polyimides exhibit high thermal stability with 5% weight loss at temperature 440 ℃ and 525 ℃.
안병현 한국고무학회 2023 엘라스토머 및 콤포지트 Vol.58 No.1
Aromatic diamine containing ortho catenation and methyl group was synthesized from 4-methyl catechol and 4-nitrobenzoyl chloride. Subsequently, a poly(amic acid) was prepared by reacting 4-methyl-1,2-phenylene bis(4- aminobenzoate) with 4,4'-hexafluoroisopropylidenediphthalic anhydride (6FDA). The resulting poly(amic acid) was transformed into a polyimide through chemical imidization. The polyimide formed was soluble in N-methyl-2-pyrrolidone (NMP) and could be cast into a flexible, transparent film. Furthermore, the polyimide exhibited a 5% weight loss at 380 ℃ in the nitrogen atmosphere.
안병현,서병로 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.2
A new glaucoma drainage implant, silicone tube attached to an expanded polytetrafluoroethylene (e-PTFE) membrane, was used in patients with recalcitrant glaucomas. Aqueous was shunted via the silicone tube to reservoir which was formed under the posterior Tenon's capsule by an oval piece of e-PTFE memberane, (Japan Gore-tex Inc., Tokyo) was 0.1mm thick, malleable and foldable. Therefore, the e-PTFE membrane of the implant could be introduced through a small incision of a quadrant conjunctiva in folded form and then spreaded over the sclera. The implant had been placed in 18 eyes of 17 patients with one or more unsuccessful glaucoma filtration surgeries including three neovascular glaucoma (NVG) patients. After follow-up of peroids ranging between seven and 18 months (mean: 10 months), 15 of the 18 eyes (83%) had controlled intraocular pressure (IOP) using 20 mmHg as normal. Three patients were not on any glaucoma medication. Seven patients required one β-blocker. Five patients were on one β-blocker and pilocarpine or a small dose of acetazolamide on their final visits. Three eyes with an unsuccessful surgery had an IOP over 25 mmHg in spite of maximum tolerated medical therapy. A postequatorial filtration bleb was found in each operated eye following removal of 5-0 cat-gut threaded through the silicone tube for the prevention of aqueous overdrainage. Postoperative complications included hyphema and fibrinous aqueous in the eyes with NVG(17%), prolonged shallow chamber(22%), obstruction of the silicone tube in the anterior chamber(6%), and choroidal datachment(6%) silicone tube in the anterior chamber (6%), and choroidal detachment(6%). The required conjuctival incision for the installation of the e-PTFE drainage implant was less than 90° and the overall surgical procedures seemed to be simple.