| Summary: | 碩士 === 淡江大學 === 化學工程學系 === 85 === The structure of a membrane is known to affect significantly
the separation performance during a filtration
operation . In this research , Nylon-66 membrane are
prepared by the "phase inversion" method . The effects of
temperature and inorganic salt additive on the membrane
structure are studied . Depending upon the precipitation
conditions , three types of membrane structure were obtained ,
i.e. , the finger-type , sponge-type , and particulate-type ,
as examined by scanning electron microscopy . As
precipitation temperature is increased , liquid-liquid phase
separation becomes obvious and the membrane shift toward the
sponge-type structure . On the other hand , addition of salt
in the dope cause a fast precipitation and the finger-type
structure emerges. Adding solvent to the precipitation bath ,
we can find that the macrovoids become smaller even
disappear.
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