透過您的圖書館登入
IP:3.17.128.65
  • 學位論文

孔隙性二氧化矽顆粒製備與探討

Preparation of porous silica particles

指導教授 : 許克瀛

摘要


利用懸浮聚合法和粒種乳化聚合法製備孔隙性聚苯乙烯-二乙烯苯共聚合物作為後續製備孔隙性二氧化矽顆粒的模版,並改變稀釋劑的種類和添加量來觀察其孔隙性的變化。再添加入四乙基矽烷(Tetraethyl orthosiliate,TEOS)於模板中並行水解縮合反應,之後利用高溫鍛燒方式將模板去除而得到具有孔隙性的微米級二氧化矽顆粒。另外以溶膠凝膠法並添加離子型界面活性劑溴化十六烷基三甲酯(cetyltrimethylammonium bromide ,CTAB)與十二烷胺鹽酸鹽(Dodecylamine Hydrochloride ,DLHC)製備奈米級孔隙性二氧化矽顆粒,添加三乙醇胺(Triethanolamine, TEA)改質TEOS減緩其反應速率以減低二氧化矽顆粒間的團聚現象,並改變乙醇的添加量來減緩凝膠化時間以使顆粒間的分散度達到最大,在以改變離子型界面活性劑的添加量來觀測其孔隙度的變化。 使用的分析儀器包括SEM、BET等儀器,在SEM上,可觀察顆粒的粒徑大小和表面結構以及顆粒間的分散情形,從BET中,觀測顆粒的比表面積和孔洞大小以及孔隙體積。

並列摘要


The porous polystyrene - divinylbenzene copolymer particles were prepared by Suspension polymerization and Seeded emulsion polymerization. The porous polystyrene - divinylbenzene copolymer particles were as a templates for subsequent preparation of silica particles, and change the type and quantity of diluent to observe the porosity of the changes. Adds Tetraethyl orthosiliate in parallel of the template and hydrolysis condensation reaction. followed by calcination to remove the template and get a porous silica microspheres. The porous silica nanospheres were prepared by Sol-Gel and add-ionic surfactant cetyltrimethylammonium bromide and Dodecylamine Hydrochloride. Added the Triethanolamine to stabilize the hydrolysis-condensation process and to avoid agglomeration. Change the amount of ethanol to slow gel time.for dispersed silica particles. in order to change the ionic surfactants are added to observe the amount of change in its porosity.Change the amount of ionic surfactants to observe porosity There are many instruments of analysis to be used, including SEM and BET. From the SEM results , the particles size and surface structure were observed. From the BET results, specific surface area、average pore diameter and average pore volume of particles were observed.

參考文獻


1. K. P. Lok and C. K. Ober, Can. J. Chem., 63, 209(1985)
2. C. K. Ober, K. P. Lok, and, M. L. Hair, J. Polym.Sci.:Polym. Lett. Ed., 23, 103(1985)
9. S. A. Chen, H. S. Chang, J. Polym. Sci. Polym. Chem.Ed., 23, 2615, (1985)
13. R. Arshady, J. Microencapsulation, 5, No. 2, 101(1992)
16. C. M. Cheng, F. J. Micale, J. W. Vanderhoff. and M. S. EL-Aasser, J. Polym. Sci. : Part A, 30, 235-244 (1992)

延伸閱讀