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Transparent Epoxy resin toughened with In-situ azide-alkyne Polymerized Aliphatic Toughening agent
( Nho Hoon Kwak ),( Jun Huy Yu ),( Su Hyun Lim ),( Bum Jae Lee ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
To improve the toughness of the epoxy resin while maintaining their transparency, a novel polymer, which has an aliphatic structure, is synthesized via in-situ azide-alkyne polymerization as a toughening agent. Because of the dissimilar kinetics of the epoxy system and click reaction, sequential curing process was designed. There in-situ toughened epoxy with about 10wt% content of in-situ toughener of poly(BAC/PCLDA) showed excellent increase of fracture toughness while the transmittance of epoxy system was maintained. The homogeneous phase for the fracture surface of in-situ toughened epoxies in SEM micrographs was quite different from the two-phase morphology for the conventional preformed polymer-toughened epoxy systems.
Transparent Epoxy Resin Toughened with In-situ Azide-alkyne Polymerized Aliphatic Toughening Agent
Nho Hoon Kwak(곽노훈),Jin Seo Lee(이진서),Na Yeong Ko(고나영),Hee Sang Yang(양희상),Wu Bin Ying(영우빈),Bumjae Lee(이범재) 한국고분자학회 2019 폴리머 Vol.43 No.2
투명성을 유지하면서 에폭시의 인성을 향상시키기 위해서, in-situ 방법을 이용한 새로운 지방족 구조의 폴리머를 강인화제로 사용하였다. 에폭시와 click 반응의 유사한 반응 속도를 연구하고, 이를 통해 연속적인 에폭시 경화단계를 확립하였다. 먼저 선형의 지방족 강인화제를 에폭시 수지에서 합성하였고 그 후 경화제를 첨가하여 에폭시를 경화하였다. 이를 통해 semi-interpenetrating polymer network(semi-IPN) 구조를 가지는 에폭시를 제작하였다. Semi-IPN 구조를 가지는 강인화 에폭시의 특성은 기존 에폭시 및 preformed 에폭시에 비해 물성이 현저히 향상되었다. 10 wt% 강인화 에폭시의 경우 투명성과 Tg의 변화를 보이지 않으면서 2.62 MPa·m<SUP>1/2</SUP>의 향상된 파괴인성 수치 를 보였다. To improve the toughness of the epoxy resin while maintaining their transparency, a novel polymer, which has an aliphatic structure, is synthesized via in-situ azide-alkyne polymerization as a toughening agent. Because of the dissimilar kinetics of the epoxy system and click reaction, sequential curing process was designed. First, linear aliphatic toughening agents were formed in the epoxy resin, followed by curing of the epoxy matrix as the addition of curing agent, resulting in a semi-interpenetrating polymer network (semi-IPN). The toughened epoxy with in-situ synthesized polymer exhibits significantly improved mechanical properties compared to neat and toughened epoxy with preformed polymer, and it has increased value of toughness as high as 2.62 MPa·m<SUP>1/2</SUP> at 10 wt% of toughening agent contents with maintenance of their transparency and glass transition temperature.