Kentepozidou A, Kiparissides C
Department of Chemical Engineering and Chemical Process, Aristotle University of Thessaloniki, Greece.
J Microencapsul. 1995 Nov-Dec;12(6):627-38. doi: 10.3109/02652049509006793.
The complex emulsion/solvent evaporation technique was employed for the production of water-containing polymer microcapsules. The inner phase of the microcapsules consisted of an aqueous solution of gelatin. Several polymers (e.g. poly(styrene), poly(methyl methacrylate), ethyl cellulose, poly(vinyl chloride)) were utilized as wall-forming materials and the effect of the polymer type on the size and the surface characteristics of the microcapsules was experimentally investigated. The size of the microcapsules was strongly affected by the conditions applied during the formation of both simple (w/o) and complex (w/o)/w emulsions. Poly(styrene) microcapsules with a mean Sauter diameter in the range of 4-12 microns were prepared by varying the rate of agitation (1500-4000 rpm) and the concentration of stabilizer (potassium oleate, 0.1-1.5% w/v) used in the formation of the (w/o)/w emulsion. High stabilizer concentrations and agitation rates resulted in a significant reduction of the mean size of the complex droplets and in a simultaneous increase of the breadth of the capsule size distribution.
采用复乳/溶剂蒸发技术制备了含水聚合物微胶囊。微胶囊的内相由明胶水溶液组成。几种聚合物（如聚苯乙烯、聚甲基丙烯酸甲酯、乙基纤维素、聚氯乙烯）被用作壁材，并通过实验研究了聚合物类型对微胶囊尺寸和表面特性的影响。微胶囊的尺寸受到简单（水包油）和复乳（水包油/水）形成过程中所应用条件的强烈影响。通过改变搅拌速度（1500 - 4000转/分钟）和在水包油/水乳液形成过程中使用的稳定剂（油酸钾，0.1 - 1.5% w/v）浓度，制备了平均索特直径在4 - 12微米范围内的聚苯乙烯微胶囊。高稳定剂浓度和搅拌速度导致复合液滴的平均尺寸显著减小，同时胶囊尺寸分布宽度增加。
