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采用界面自由基聚合的方法,制备了以聚二甲基丙烯酸乙二醇酯(PEGDMA)为壁材,薄荷素油(DPO)与石蜡或者三辛癸酸甘油酯(GTCC)的混合物为芯材的微胶囊.微胶囊壁材是二甲基丙烯酸乙二醇酯(EGDMA)单体通过界面自由基聚合形成的高聚物PEGDMA.提出了该界面自由基聚合形成PEGDMA的机理过程.利用光学显微镜和扫描电镜探究了乳化剂类型、芯材组成和固化温度对微胶囊形貌的影响.用傅里叶红外光谱对微胶囊的化学结构进行了表征.利用紫外分光光度计测出了未被微胶囊包埋的芯材占总芯材的百分比(free oil).并用热重分析仪分析了微胶囊的热稳定性能,讨论了固化时间对微胶囊热性能的影响.结果表明,采用阿拉伯树胶为乳化剂,芯材组成为质量比M_(DPO)/M_(GTCC)=1∶1,在60℃下固化1 h,制备出的微胶囊为饱满的球形状,表面光滑.同时测得该体系中芯材的free oil为26.5 wt%.PEGDMA微胶囊在60℃固化温度下反应3 h,具有很好热稳定性,且固化温度升高能提高微胶囊的热稳定性.所制备的微胶囊无毒,在个人护理品和医药领域具有广泛的应用前景.
The interfacial free radical polymerization was used to prepare a mixture of polyethylene glycol dimethacrylate (PEGDMA) as wall material, menthol oil (DPO) and paraffin wax or trioctanoic acid caprylate (GTCC) Microcapsule.The microcapsule wall material is a polymer PEGDMA formed by the free radical polymerization of ethylene glycol dimethacrylate (EGDMA) monomer.The mechanism of free radical polymerization of PEGDMA into PEGDMA was proposed.Using optical microscope and The effects of emulsifier type, core composition and curing temperature on microcapsule morphology were investigated by scanning electron microscopy (SEM). The chemical structure of microcapsules was characterized by Fourier transform infrared spectroscopy (FTIR) And the thermal stability of the microcapsules was analyzed by thermogravimetric analyzer.The effects of curing time on the thermal properties of microcapsules were discussed.The results showed that the use of gum arabic as the emulsifier The prepared microcapsules were full spherical shape and smooth surface with the mass ratio of M_ (DPO) / M_ (GTCC) = 1: 1 and curing at 60 ℃ for 1 h, The free oil of core material is 26.5 wt% .PEGDMA microgel It has good thermal stability when it is cured at 60 ℃ for 3 h, and the increase of curing temperature can improve the thermal stability of microcapsules. The prepared microcapsules are nontoxic and have a wide range of applications in personal care products and medicine .