以聚甲基丙烯酸甲酯製備制放性精油微膠囊之研究

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题名:	以聚甲基丙烯酸甲酯製備制放性精油微膠囊之研究 Preparation and Controlled Release Properties of Poly(methyl methacrylate) Microcapsules Containing Volatile Essential Oil
作者:	閻培原
贡献者:	化學工程與材料工程學系奈米材料碩士班
关键词:	聚甲基丙烯酸甲酯微膠囊精油釋放 PMMA Microcapsule Oil release
日期:	2019
上传时间:	2019-08-22 10:04:24 (UTC+8)
摘要:	本研究主要使用對人體無毒無害之聚甲基丙烯酸甲酯(Poly(methyl methacrylate))，採用總體聚合法進行聚合反應合成，以不同重量比添加溶劑予以稀釋，以稀釋的PMMA作為微膠囊之殼材，藉由PMMA良好之耐候性、機械性、易加工性、無毒性及抗藥性等特性，採用物理化學法中的溶劑揮發法製備成微膠囊，用以包覆高揮發性之柑橘精油。本實驗探討使用PMMA作為微膠囊殼材之可行性、微膠囊之粒徑大小及測試微膠囊緩釋效果。結果顯示，用傅立葉紅外光譜分析儀分析，證實聚甲基丙烯酸甲酯已成功製備，並選取與溶劑比例配比為1:25時的微膠囊，以光學顯微鏡觀察其外觀呈現球型，並觀察出微膠囊型態為混合粒之型態，其分散良好且無團聚現象，最小平均粒徑則為1.33±0.32μm。探討不同轉速條件下之平均粒徑，發現轉速不同時並不會造成平均粒徑有太大的變化。在掃描式電子顯微鏡下觀察可以發現微膠囊表面具有孔洞。藉由紫外/可見光分光光譜儀測試換算結果得知包覆率至少為85%以上，經紅外線水分儀測試微膠囊緩釋效果及芯殼比，結果顯示所有比例的微膠囊皆可以使柑橘精油達到緩釋效果，持續釋放效果可以達到480 min，最佳芯殼比則是在聚甲基丙烯酸甲酯與溶劑比例配比為1:12.5時的49.19%，並測試殼材之熱性質得知Tg點及Td點分別為75℃及170℃。藉由本實驗可以證實以溶劑揮發法製造聚甲基丙烯酸甲酯微膠囊之可行性、外觀成形性及其緩釋效果，並且可以根據不同需求製作大小不同粒徑及不同釋放效果之微膠囊。 Poly (methyl methacrylate) is known as non-toxic and harmless to the human body. In this study, PMMA preparation by bulk polymerization. In addition to diluting with solvent. Then solvent was added in different weight ratios to dilute PMMA as microcapsules shell material. PMMA is characterized as good weather resistance, mechanical properties, easy processing, non-toxicity and resistance to chemicals. Prepared microcapsules by Physicochemical methods of solvent evaporation method coated essential oils. This experiment to explore the possibilities of PMMA as a microcapsule shell material, the particle size of microcapsules and testing the sustained release effect of microcapsules. Samples analyzed by FTIR and results showed that the PMMA was successfully prepared by bulk polymerization. The appearance of the microcapsules is spherical under the optical microscope. Laser particle size analyzer shows the minimum average particle size is 1.33 ± 0.32 μm. Also found that particle size at different rotational speeds does not cause too much change. Scanning electron microscope (SEM) observation revealed pores on the surface of the microcapsules. UV/visible spectrometer test conversion results show that the coverage rate at least 85%. The results of the Infrared moisture meter show that all proportions of microcapsules can achieve a sustained release effect of the essential oil, and the delayed release effect can reach 480 min. Best optimum core-shell ratio was 49.19%. By thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC) analyzer thermal properties of the shell material that Tg and Td are respectively 75 ℃ and 170 ℃. This experiment confirms the feasibility, appearance formability and sustained release effect of producing PMMA microcapsules by the solvent evaporation method. According to the different needs microcapsules with different particle sizes and different release effects can be made.
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