摘要
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.
In this study,microcapsules with poly（ ethyleneglycol dimethacrylate）（ PEGDMA） shell were prepared through interfacial free-radical emulsion polymerization. The mixture of dementholized peppermint oil（ DPO） and paraffin or caprylic capric triglyceride（ GTCC） was used as core materials. The interfacial freeradical polymerization mechanism for forming the PEGDMA shell was proposed. The morphologies of PEGDMA microcapsules prepared with different kinds of emulsifiers,different compositions of core materials and different curing temperature were explored by optical microscope and scanning electron microscope（ SEM）. SEM images showed that the morphology of microcapsules is sphere as synthesized at 60 ℃ for 1 h by using gum arabic as emulsifier with 1∶ 1 ratio of DPO/GTCC as core material. Fourier transform infrared-attenuated total reflectance was used to analyze the chemical structure of the microcapsules. An increase of curing temperature can improve the thermal stability of the core material. The thermal properties of core material,PEGDMA microcapsule,and PEGDMA shell were studied by thermogravimetric analysis（ TGA）,indicating that the microcapsules cured at 60 ℃ for 3 h had a much better thermal stability than pure core materials. The free oil in the microcapsule dispersion measured by ultraviolet（ UV） spectrophotometer was 26. 5 wt%. Novel PEGDMA microcapsules will find a wide range of applications in personal care,biomedical device,and etc.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2016年第3期345-351,共7页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51473032
51503034)
上海科委杨帆计划(项目号15YF1400700)
中央高校基础研究专项基金(基金号2232015D3-12)资助项目
