Water vapor permeabilities of cassava and tree cassava films are shown in table 3, values ranged from
(3.28 ± 0.33) x 10-10 g/s.m.Pa to (4.47 ± 0.44) x 10-10 g/s.m.Pa for cassava films and from (1.97 ± 0.03) x 10-
10 g/s.m.Pa to (3.86 ± 0.22) x 10-10 g/s.m.Pa for tree cassava films. The increase of glycerol content increased
water vapor permeability of the films as it can be observed in table 3. Glycerol is a relatively small
hydrophilic molecule, which can be inserted between adjacent polymeric chain, decreasing intermolecular
attractions and increasing molecular mobility, which facilitates the migration of water vapor molecules.
Similar results were reported in literature [16]. Regardless of the glycerol content, tree cassava films
presented better WVP values.