Absorbance profile inside membrane

Figure 3. Model of Absorbance profile inside membrane.

Figure 2. Absorbance profile inside C0CI2 containing membrane during first 60 min. Water enters from the right and evaporates at the left edge. Smooth curves are fits to Eq 1 for dye bleaching.

As was found by microphotometration, the concentration gradient of the grafted PAA inside the membrane and its profile depend very much on the amount of the monomer absorbed. It was also evident that, because of the method used for preparation, polymerization of the acid was initiated mainly by PO radicals formed on polypropylene chains by thermal and redox decomposition of POOH hydroperoxides or POOP peroxides. The homopolymer of polyacrylic acid which was also formed inside the film was later removed by long time elution with methanol. 

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