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- 주제어 : Amine initiators (검색결과 4 건)
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음이온 리빙중합에 의한 방향족 아민 양말단변성 폴리부타디엔의 합성
전준표,이범재,박상호 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2
Functionalization reaction of poly(butadienyl)lithium with 4,4'-bis(dimethylamino)-benzophenone, 4,4'-bis(diethylamino)benzophenone, 1,1'-bis[(4-dimethylamino)phenyl]ethylene, and 1,1'-bis[(4-diethylamino)phenyl]ethylene in n-heptane provide the corresponding ω-amine chain-end funstionalized polymers in 90∼95% yields. α-Functionalized polybutadienes were prepared by the polymerization using amine functional initiator, which was obtained by the stoichiometric reaction of sec-butyllithium and 1,1'-bis[(4-dimethylamino)phenyl]ethylene, or 1,1'-bis[(4-diethylamino)phenyl]ethylene. Utilizing these two reaction technologies, well-known α,ω-difunctionalized polybutadienes could be synthesized by the polymerization using amine functional initiator followed by chain-end functionalization.
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고체 amine 광개시제에 따른 치과용 복합수지의 중합효율
선금주 대한치과기공학회 2006 대한치과기공학회지 Vol.28 No.1
Three t-amines, 4-(dimethylamino)benzoic acid (ABA), 4-(dimethylamino)benzaldehyde(MBA), 4-(dimethylamino)benzophenone (MBP), were investigated as new visible lightphotoinitiators for a dental resin composite of UDMA in order to improve photopolymerizationeffect. Three t-amines mixed with three photosensiizers, CQ, PD and DA, respectively. And thephotopolymerization effect of photoinitiators were compared with that of 4-(dimethylamino)ethyl methacrylate (AEM), the most widely used photoinitiator. Thephotopolymerization efficiency of UDMA containing the photoinitiator increased withirradiation time. The increase was in the order: MBP<ABA<AEM<MBA. And thephotopolymerization efficiency of CQ containing MBA was better than PD or DA.
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Star형 Poly(ε-caprolactone) 합성과 약물 전달체로 응용
임원택(Won Taek Lim),고영수(Young Soo Ko) 한국고분자학회 2021 폴리머 Vol.45 No.5
Poly(ε-caprolactone)(PCL)을 분자 내 OH기의 수가 1, 3, 4개인 아민 화합물을 개시제로 사용하여 PCL 벌크 중합 및 용액중합을 실시, 선형 및 star형 PCL을 합성하였다. 벌크중합으로 선형 PCL을 중합한 경우 [CL]/[I] 비가 크면 분자량과 녹는점이 증가하였다. 또한 개시제의 OH기 수가 증가하면 분자량과 녹는점이 감소하였다. 용액중합의 경우 개시제의 OH기 수가 증가하면 벌크중합과 반대로 분자량과 녹는점이 증가하였다. 얻어진 선형 및 star형 PCL을 이용, bovine serum albumin(BSA) 로딩된 마이크로입자를 제조하였다. 로딩분율은 선형 PCL이 star PCL보다 컸으며 4가지형 PCL이 3가지형 PCL보다 작았다. 약물 방출속도는 선형보다 star형 PCL이 느리게 방출되었고 가지가 많은 star PCL이 상대적으로 더 느렸다. Poly(ε-caprolactone) (PCL) were prepared using amines with 1, 3 or 4 OH groups to synthesize linear and star PCL via bulk and solution polymerization. For bulk polymerization of PCL, the molecular weight (MW) and melting point (m.p.) increased as the [CL]/[I] ratio increased. In addition, as the number of OH groups of the initiators increased, the MW and m.p. decreased. For solution polymerization of PCL, as the number of OH groups of an initiator increased, the MW and m.p. increased as opposed to bulk polymerization. Microparticles loaded with bovine serum albumin (BSA) were successfully prepared with PCL. The loading % of BSA in microparticle prepared with linear PCL was larger than that of star PCL, and the three branched PCL showed smaller BSA loading than that of four branched PCL. The drug release rate was slower for star PCL than linear PCL, and relatively slower for star PCL with many branches.
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