Recently, vegetable oils have been exploited for the production of bio-based polyol due to their biodegradability, renewability and reasonable prices in comparison with petroleum-based polyol. Cardanol derived from cashew nut shell liquid oil (CNSL) is renewable resource having a reactive aliphatic double bond and phenolic compound that could be used in preparation of the novel functional materials for versatile polymers. Over the years, various derivatives of cardanol have been continuously studied and also cardanol-based polyol has been explored in various application fields of polyurethane. In this study, biopolyol derived from cardanol was prepared using 1,4-dibromobutane (DB) for intermediate, followed by chemical modification with diethanolamine (DEA). The molecular structure of cardanol based polyol was analyzed by 1 H NMR, FTIR and GPC. Biopolyurethane (BPU) film was prepared with hexamethylene diisocyanate (HDI) using dibutyltin dilaurate (DBTDL) as a catalyst. BPU film showed antibacterial property against Escherichia coli (E. coli). Cross-linked BPU film exhibits higher tensile strength and thermal stability than BPU film. This reveals that cardanol-based BPU is a suitable candidate for various applications as an environment-friendly polymeric material.

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초록: 본 연구에서는 Diels-Alder 반응 기반의 자가치유능을 가지는 물질을 포함하는 마이크로 캡슐 제조와 이의 자 가치유 특성에 관하여 체계적인 분석을 진행하였다. 자가치유 물질을 포함하는 마이크로 캡슐이 고분자 복합체에 적용되었을 때 자가치유 효과를 발현할 수 있도록 푸란계 고분자 합성과정에서 poly(ethylene glycol) 사슬을 도입하 여 유동성을 가질 수 있도록 하였다. 마이크로 캡슐 내부에 합성된 푸란계 고분자와 비스말레이미드를 각각 도입하 였으며, 해당물질들이 캡슐 내부에 성공적으로 도입되었는지 확인하였다. 또한 합성조건과 마이크로 캡슐의 기계적 물성과의 상관관계를 규명하였으며, 마이크로 캡슐이 분산된 poly(methyl methacrylate) (PMMA) 기반의 고분자 복 합체에 균열을 발생시킨 후, 마이크로 캡슐에서 유출된 물질에 의한 자기치유능을 확인하였다. 이는 마이크로 캡슐 내에 포함된 푸란계 고분자가 가지고 있는 유동성에 의한 결과이며, 이러한 결과를 바탕으로 본 연구에서 제조된 푸란계 고분자가 함유된 마이크로 캡슐은 자가치유 특성을 가지고 있음을 확인하였다.Abstract: In this study, the microcapsules containing self-healable polymeric materials based on the Diels-Alder reaction were prepared and the systematic studies about the self-healing property of the microcapsules were performed. Poly(ethylene glycol) chains were applied in the polymerization of furan-polymer to increase the mobility of self-healable materials. The furan-polymer and bismaleimide were introduced into the core of microcapsule, respectively, and these were successfully confirmed using dye modified materials. The relationship between the synthetic conditions and mechanical properties of microcapules was clarified by measurement of capsule strength, and the self-healing ability of macrocapsules in the PMMA-based polymeric composite was confirmed by the release of core materials by OM, SEM and FTIR. These were considered to be originated from the mobility of furan-polymer in the core of microcapsules. Based on these results, it was confirmed that the microcapsules containing the self-healable furan-polymer in this study have the self-healing properties.