GPC of polyvinyl alcohol using a vinyl copolymer column

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yosefpour
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GPC of polyvinyl alcohol using a vinyl copolymer column

we are using GPC column made of vinyl copolymer in order to determine the MW distribution of PVA( poly vinyl alcohol). however, though the MW of PVA is surely in the range of our standards ( pullulan), PVA shows a time longer than expected and comes out very late. the mobile phase is acetate buffer.

any idea?
thanks in advance