以密胺树脂和丙烯酸酯为囊材,采用微胶囊双层包覆方法改善茉莉香精的耐热和缓释性能,采用傅里叶红外光谱仪(FT-IR)和扫描电镜(SEM)对微胶囊的结构和形貌进行了表征,结果表明包覆完全,形貌规整。 热重法 TG 测得单层微胶囊在 200 ℃以下时匀速失重,在 200 ~ 250 ℃快速失重,而双层微胶囊的失重速率明显小于单层微胶囊。 50 ℃恒温热失重法测得双层微胶囊的释放速率小于单层微胶囊,27 d 后的失重率小于 10. 1% 。

Microencapsulated jasmine perfume was prepared by double-layered capsulation method to improve its thermal stability and sustained-release, in which melamine-formaldehyde and acrylic ester were chose as wall materials. The obtained microcapsules were characterized in terms of morphology and chemical structure by scanning electron microscopy ( SEM), Fourier infrared spectrometer ( FT-IR) and scanning electron microscopy ( SEM), and results showed that the oil-soluble fragrance had been encapsulated completely. Furthermore, weight loss rate of capsulated jasmine perfume was also measured by thermo-gravimetry analysis. It was found that in case of single-layered microcapsule, the weight loss was kept in constant before 200 ℃ , and then accelerated rapidly from 200 ℃ to 250 ℃ . The weight loss rates of double-layered microcapsules, on the other hand, were much lower than those of single-layered ones. Thermostat thermal weight loss in 50 ℃ showed that the perfume release rate of double-layered microcapsule was significantly lower than that of single-layered one, and the weight loss rate was less than 10. 1% after 27 days.