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首页> 外文期刊>Journal of Applied Polymer Science >PRODUCTION OF OIL-CONTAINING CROSSLINKED POLY(VINYL ALCOHOL) MICROCAPSULES BY PHASE SEPARATION - EFFECT OF PROCESS PARAMETERS ON THE CAPSULE SIZE DISTRIBUTION
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PRODUCTION OF OIL-CONTAINING CROSSLINKED POLY(VINYL ALCOHOL) MICROCAPSULES BY PHASE SEPARATION - EFFECT OF PROCESS PARAMETERS ON THE CAPSULE SIZE DISTRIBUTION

机译：相分离法制备含油交联聚乙烯醇微胶囊-工艺参数对胶囊尺寸分布的影响

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摘要

Oil-containing poly(vinyl alcohol) (PVA) microcapsules in the size range of 5-20 mu m were prepared by the simple coacervation of PVA followed by chemical crosslinking of the coacervated PVA membrane with glutaraldehyde. Coacervation of the aqueous polymer solution was achieved by the addition of a phase separation inducer (e.g., sodium sulfate). PVA of different grades (e.g., molecular weight and degree of hydrolysis) was utilized both as stabilizer and wall-forming material. Dispersion of the oil phase in the aqueous PVA solution was effected by a homogenizer. The effects of the various process parameters, such as the agitation speed, the type and concentration of PVA, the volume ratio of the internal oil phase to the external aqueous phase, the viscosity of the oil phase as well as the electrolyte concentration in the aqueous solution, on the stability and the size distribution of the emulsion droplets and microcapsules were experimentally investigated. It was shown that high agitation rates and low interfacial tension (e.g., high PVA concentrations) resulted in a significant reduction of the size of the emulsion droplets and microcapsules. On the other hand, as the viscosity and the amount of the dispersed oil phase increased, the capsule size increased. Finally, it was found that the concentration of the electrolyte significantly affected the stability of the (o/w) emulsion, the size and concentration of coacervated PVA colloidal aggregates, as well as the morphology of the polymer wall membrane formed by the adsorption of the polymer-rich phase to the oil/water interface. (C) 1996 John Wiley & Sons, Inc. [References: 32]
机译：通过简单凝聚PVA，然后将凝聚的PVA膜与戊二醛化学交联，制得大小范围为5-20μm的含油的聚乙烯醇（PVA）微囊。聚合物水溶液的凝聚通过加入相分离诱导剂（例如硫酸钠）来实现。不同等级（例如分子量和水解度）的PVA被用作稳定剂和壁形成材料。通过均化器将油相分散在PVA水溶液中。各种工艺参数的影响，例如搅拌速度，PVA的类型和浓度，内部油相与外部水相的体积比，油相的粘度以及水溶液中的电解质浓度溶液中，对乳液液滴和微胶囊的稳定性和尺寸分布进行了实验研究。已经表明，高搅拌速率和低界面张力（例如，高PVA浓度）导致乳液液滴和微胶囊的尺寸显着减小。另一方面，随着粘度和分散油相的量增加，胶囊尺寸增加。最后，发现电解质的浓度显着影响（o / w）乳液的稳定性，凝聚的PVA胶体聚集体的大小和浓度，以及通过吸附PVA形成的聚合物壁膜的形态。富含聚合物的相进入油/水界面。 （C）1996 John Wiley＆Sons，Inc. [参考：32]

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