2.5. Preparation of sisal microfibril/gelatin biomass composites
The sisal microfibrils with short aspect ratios were added into
the modified gelatin solution and mixed under agitation. Then
the mixture were poured into a self-made polypropylene mold
and dried in air at room temperature. This method is called as solvent-
casting technique. The composite prepared in this way is denoted
as SMF/Gel biomass composite. The sisal microfibrils with
long aspect ratios were mixed with water to make a mat by negative-
pressure filtration. Put the sisal microfibrils mat in the mold,
and pour the modified gelatin solution into the mold. The composites
were dried in air at room temperature. This method is called as
solution impregnation technique. A composite with high microfibril
content can be prepared by this method. The composite prepared
is denoted as SMFm/Gel biomass composites.