Preparation of Oil-containing Poly (vinyl alcohol) Microcapsules through Phase Separation
Date Issued
2007
Date
2007
Author(s)
Wu, Keng-Chao
DOI
zh-TW
Abstract
Oil-containing poly (vinyl alcohol) (PVA) microcapsules were prepared by simple coacervation followed by the chemical cross-linking of coacervated PVA membrane with glutaric aldehyde through phase separation method. The effect of the process parameters such as agitation speed, temperature and the amount of oil and emulsifier on the capsule size distribution and capacity were investigated and Design-expert 5 was used to find out the interaction between process parameters. It was shown that high agitation rates resulted in a reduction of the size of microcapsules, but more oil evaporated and more PVA aggregation as the effect of higher temperature with less oil . On the contrary, with sufficient oil the higher temperature made the crosslinking rate and the size of microcapsules increase. If more oil is used, more emulsifier was needed to protect the oil droplets so that the capsules size increased. The analysis through Design-expert 5 shown that with constant emulsifier volume, the order of the influence on the capsules size distribution was oil volume ratio＞agitation speed＞temperature and oil volume ration＞temperature＞agitation on the capacity. Combining oil and emulsifier as oil phase volume, the order of the influence on the capsules size distribution was temperature＞agitation speed＞oil phase volume and oil volume ratio＞temperature and agitation speed had no effect on the capacity.
Subjects
微膠囊
相分離法
聚乙烯醇
microcapsules
phase separation
poly(vinyl alchol)
Type
thesis
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