• 제목/요약/키워드: Aromatic polyamide

검색결과 23건 처리시간 0.016초

Effects of the Nitrile Group Substitution on the Gas Separation Properties of Aromatic Polyamide Membranes

  • Park, Ho-Seung;Jo, Won-Ho;Oh, Tae-Jin;Kang, Yong-Soo;Park, Hyun-Chae
    • Fibers and Polymers
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    • 제1권2호
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    • pp.111-115
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    • 2000
  • The effects of nitrile group substitution onto aromatic polyamide backbone on the gas permeability and permselectivity of the polymers are examined. The gas permeability of aromatic polyamides increase with increasing the content of nitrile group substitution, whereas the permselectivity decreases with increasing the nitrile group contents. The effects of chain linrearity on the permeability and permselectivity are also examined. The non-linearity of the polymers increases the permeability. These behaviors are interpreted in terms of chain packing and crystallinity of the aromatic polyamides.

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Polyamide Microcapsule의 성질과 서방성 (Sustained Drug Release of Polyamide Microcapsules)

  • 김계용;김진홍
    • 대한의용생체공학회:의공학회지
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    • 제8권2호
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    • pp.135-144
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    • 1987
  • Polyamide microcapsules were designed for a sustained drug release. As a model, riboflavin was e no apsulated in polyamide microcapsules. Polyamide microcapsules were prepared from thiamines and acid bichlorides by the interfacial polycondensation reaction. The diamines used in ttlis works were ethylenediamine and 1, 6-hexamethylenediamine. Sebacoylchloride and teruphthaloylchloride were employed as acid bichlorides. The following parameters were studied; the release of several kinds of polyamide microcapsules , the various concentrations of diamines and acid dichlorides ; the various concentrations of surfactants : the various pH range of sink solution during the dissolution test. The release amount of riboflavin from aromatic polyamide micrcapsule was higher than that of aliphatic polyamide microcapsule The release rate of riboflavin from the polyamide microcapsule was decreased with increase of concentration of thiamines, arid dichlorides and surfactants which is used for preparing polyamide microcapsule. Release riboflavin from polyamide microcapsule was lower at pH 7 than pH 2 in sink-solution for dissolution test.

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고차가지구조 방향족 폴리아미드의 합성 및 물성 (Synthesis and Physical Properties of Hyperbranched Aromatic Polyamide)

  • 옥창율;김장엽;허완수;이상원
    • 폴리머
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    • 제29권6호
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    • pp.571-574
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    • 2005
  • [ $\AB_{2}$ ]형 단량체인 5-aminoisophthalic acid로부터 TPP를 촉매를 이용한 축중합 반응을 통하여 고차가지구조 방향족 폴리아미드를 합성하였다. 합성된 고차가지구조 고분자의 카복시 말단을 에탄올, 헥산올, 도데칸올로 에스테르화 하여 특성을 연구하였다. 카복시 말단의 고차가지구조 고분자에 비해 알킬기가 치환된 고차가지구조 고분자의 용해도가 증가하였다. 또한 말단의 알킬기의 길이가 길어짐에 따라 10wt$\%$ 무게 감소 온도가 감소하였다.

Synthesis and Characterization of Aromatic Polyamideamide-imide and Polyamide-imide copolymers

  • Kim, Sang-Hern
    • 한국응용과학기술학회지
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    • 제25권2호
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    • pp.144-150
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    • 2008
  • The polyamide-amide-imide (PAAI) was synthesized by reacting 4,4'-diaminobenzanilide (DBA) with trimellitic anhydride chloride using a two-stage heating. The precursor of polyamide-acids was formed at first stage and followed by the formation of imide of PAAI. Two polyamide-imides (PAIs) were prepared from benzidine (BZ) or 4,4'-diaminodiphenylether (DPE) with trimellitic anhydride chloride. These three polymers had glass transition temperature in the temperature range of $240-250^{\circ}C$. X-ray data were obtained on thin film specimens cured at $250^{\circ}C$. There was a minimal kind of short-range order consisting of the most probable distances between neighboring chains. The average segmental spacing of short-range order decreased in the order of polymers obtained from 4,4'-diaminobenzanilide (DBA), polyamide-imide, and 4,4'-diaminodiphenylether (DPE). The imidization of three polyamide-imides was confirmed by $^{15}N$ MAS NMR and FT-IR spectroscopy. $^{15}N$ NMR spectrum of cured polyamide-imide showed imide $^{15}N$ peak, thereby providing an evidence for the imidization of three polyamide-imides.

고강도 엔지니어링 플라스틱재료의 합성 - I. Palladium-catalyzed CO Insertion 반응에 의한 전방향족 Polyamides와 Polyester의 합성 - (Synthesis and Characterization of Polyamides and Polyester Prepareds by Palladium-catalyzed CO Insertion Reaction)

  • 전창림;박상복;박내정;염성배
    • 공업화학
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    • 제3권4호
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    • pp.694-700
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    • 1992
  • Palladium 촉매에 의한 CO Insertion Heck reaction을 고분자 중합에 응용하여 가공성이 좋은 고강도 엔지니어링 플라스틱으로 응용 가능한 flexible spacer를 가진 aromatic polyamide와 Polyester를 합성할 수 있었다. 촉매로서 dichlorobis(triphenyl phosphine) palladium(II) $(PdCl_2(PPh_3)_2)$와 Palladium chloride($PdCl_2$)를 사용하였고, 이 중합 시스템은 똑같은 조건에서 polyamide와 polyester를 합성 할 수 있는 장점이 있으므로 그 중합체의 열적성질을 DSC, TGA 등으로 조사하였는데 곁사슬이 있지 않은 aromatic polyamide와 Polyester는 amide와 ester 결합의 차이에도 불구하고 전이온도등이 거의 같았다. Hexyl부터 hexadecyl까지 alkyl 곁사슬을 2,5 위치에 이중으로 가진 phenylene dibromide와 Phenylene diamine으로부터 중합체를 합성하였는데 치환기가 없는 경우에 비하여 전이온도가 감소하였고, alkyl side chain이 hexadecyl인 경우는 뚜렷한 융점을 확인할 수 있었다.

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다이머산계 폴리아미드의 합성 및 특성에 관한 연구 (Synthesis and Characterization of Dimer Acid-Based Polyamides)

  • 박현주;전호균;오상택
    • 접착 및 계면
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    • 제17권4호
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    • pp.136-140
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    • 2016
  • 본 연구에서는 aliphatic diamine 또는 aromatic diamine을 함유하는 다이머산계 폴리아미드 수지를 축합중합법으로 합성하였으며, FT-IR로 폴리아미드가 합성되었음을 확인하였다. Diamine의 구조에 따라 합성된 폴리아미드의 기계적, 열적 특성을 확인하였다. 방향족 diamine 함유 폴리아미드(DAP)의 경우 지방족 diamine 함유 폴리아미드(DAH) 보다 인장강도와 전단접착강도가 우수하였다. DSC thermogram에서 DAP는 DAH 보다 높은 $T_g$$T_m$을 나타내었다. DAP의 연화점은 $112-115^{\circ}C$이고, DAH는 $98-121^{\circ}C$이었다.