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 free-radical 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.