화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.14, No.3, 354-359, May, 2003
Export Citation
Al2O3를 함유한 Poly(ε-caprolactone)/Poly(ethylene oxide) 마이크로캡슐의 향오일 방출거동
A Study on Fragrant Oil Release of the Poly(ε-caprolactone)/Poly(ethylene oxide) Microcapsules Containing Al2O3
박수진†, 양영준, 이재락, 서동학1
  • 한국화학연구원 화학소재연구부, 대전 305-600
  • 1한양대학교 화학공학과, 서울 133-791
Soo-Jin Park†, Young Jun Yang, Jae-Rock Lee, and Dong-Hack Suh1
  • Advanced Materials Division, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
  • 1Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea
E-mail:
초록
본 실험에서는 소수성의 PCL과 친수성의 PEO의 함량비를 변화시키면서 액중건조법을 이용하여 향오일이 흡착된 Al2O3를 심물질로 함유하는 마이크로캡슐을 제조하였다. 또한, Al2O3의 화학적 처리가 마이크로캡슐의 향오일 방출거동에 미치는 영향을 고찰해 보았으며, 산-염기 표면처리 용액으로서 30 wt% HCl(Al2O3-HCl)과 30 wt% NaOH(Al2O3-NaOH) 용액을 각각 사용하였다. 처리 전후의 Al2O3의 표면 산-염기도는 Boehm 선택 중화법을 이용하여 측정하였다. PEO의 함량에 따른 마이크로캡슐의 형태는 image analyzer와 scanning electron microscope (SEM)을 통하여 관찰하였다. FT-IR 측정을 통하여 심물질이 함입되었음을 확인하였으며, 또한 접촉각 측정을 통하여 표면 자유에너지의 변화를 알아보았다. 그 결과, PCL/PEO 마이크로캡슐의 직경, 표면 자유에너지 그리고 향오일의 방출속도는 PEO의 함량이 증가할수록 증가하였다. 또한 Al2O3-HCl을 함유한 PCL 마이크로캡슐의 향오일 방출속도는 감소하였는데, 이는 PCL/PEO 마이크로캡슐의 친수성의 증가와 산-염기 반응에 의해 물리화학적으로 Al2O3와 향오일간의 분자간 인력이 증가하였기 때문이라 사료된다.
In this work, biodegradable polymers of hydrophobic poly(ε-caprolactone) (PCL) and hydrophilic poly(ethylene oxide) (PEO) were prepared in different weight ratios, 100:0, 90:10, 80:20, and 70;30, to manufacture the microcapsules containing Al2O3 and fragrant oil by an oil-in-water (o/w) emulsion solvent evaporation method. The release behaviors of microcapsules were studied by chemical treatments of Al2O3 with 30 wt% HCl and Al2O3 with 30 wt% NaOH. The acid and base values were investigated with the Boehm's titration technique. The effect of PEO content on the diameter and shape of microcapsules were observed with image analyzer and scanning electron microscope (SEM). PCL/PEO microcapsules containing fragrant oil were confirmed by FT-IR. The variation of surface free energy of the microcapsules characterized by contact angles was examined in terms of PEO ratio in the blending system. As a result, it was found that the diameter, surface free energy, and fragrant oil release rate of PCL/PEO microcapsules increased with increasing the PEO ratio. However, the fragrant oil release rate of PCL microcapsules containing Al2O3-HCl decreased. These results were mainly due to the increased hydrophilicity of the microcapsules or the acid-base interfacial interactions between Al2O3-HCl and fragrant oil.
Keywords:microcapsule;fragrant oil;poly(ε-caprolactone);poly(ethylene oxide);release behavior;chemical treatment
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