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Polymer(Korea), Vol.43, No.1, 156-167, January, 2019
PMMA의 현탁 및 유화 공중합에 의한 아이코산의 미세캡슐화:공단량체 및 가교제의 영향에 대한 정성적 분석
Microencapsulation of Eicosane with Suspension and Emulsion Copolymerizations of PMMA: A Qualitative Evaluation of the Effects of Comonomers and Crosslinkers
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초록
파라핀계 상변환 축열재의 응용 확대를 위해 모델 물질로 탄소수 20개인 아이코산을 택하고 이를 분산중합에 의해 미세캡슐화한 후 그 축열 거동을 관찰하였다. 메틸 메타크릴레이트(MMA)을 기본 단량체로 하고 유화중합법과 현탁중합법이 사용되었으며, 공단량체로는 메틸 메타크릴산(MAA), 에틸 메타크릴레이트(EMA), 부틸 메타크릴레이트(BMA)가 사용되었다. 미세캡슐화 방법을 달리하는 인자로는 중합법, 공단량체의 종류 및 무게분율, 가교제의 종류 및 투입량이 있다. 미세캡슐화 입자의 모폴로지, 입자 크기, 미세피낭 효율, 열적 거동 등이 관찰되었으며, 이들의 관찰은 FTIR, SEM, DSC, TGA를 통해 이루어졌다.
Eicosane, which is a saturated linear hydrocarbon with 20 carbons, was selected as a core phase change material (PCM) for microencapsulation with dispersion polymerizations. The microencapsulation reactions were carried out by emulsion and suspension copolymerization of methyl methacrylate (MMA) with comonomers such as methacrylic acid (MAA), ethyl methacrylate (EMA), and butyl methacrylate (BMA). The preparation methods were diversified through varying different factors, such as polymerization method, the kinds and composition of comonomers, and crosslinking agents. The morphology, particle sizes, and thermal properties including encapsulation efficiency of the prepared microcapsules were analyzed using Fourier transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, and thermogravimetric analysis.
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