barrier properties of cellulose nanocrystals -pva nanocomposites
نویسندگان
چکیده
the aim of this study was to investigate the barrier properties of cellulose nanocrystals-pvananocomposites. nanocomposite films with different filler loading levels (3, 6, 9 and 12% by wt) weredeveloped by solvent casting method. the effect of cellulose nanocrystals on the barrier properties ofthe nanocomposites was studied. to this end, moisture absorption, water vapor permeability (wvp),oxygen transmission rate (otr) and chemical vapor transmission rate (cvtr) of nanocompositefilms were measured. the results showed that adding cellulose nanocrystals improve barrierproperties, by reduction of the moisture absorption, wvp, otr and cvtr of nanocomposites. theseimprovements in the barrier properties of nanocomposites were attributed to the high crystallinity andthe strong interactions between the hydroxyl groups of cellulose nanocrystals and pva chains,indicating that the cellulose nanocrystals were well dispersed and adherent to the pva matrix.furthermore, cellulose nanocrystals provide tortuous path for diffusing molecules to pass through thefilm. barrier properties improvement in fully hydrolyzed matrices was more significant than partiallyhydrolyzed matrices.
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عنوان ژورنال:
جنگل و فرآورده های چوبجلد ۶۷، شماره ۳، صفحات ۵۱۷-۵۲۸
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