Moisture sorption kinetics of cassava flour film was investigated at various relative humidities (RH). Their
curves were fitted to a Peleg model. This film was also studied for its sorption isotherm. Empirical models
were tested to fit the experimental data. Moisture sorption was more rapid in the initial stages; less
moisture was adsorbed as adsorption time increased. GAB and Lewicki models were found to be
better-fitted models. Effects of sorbitol concentration and RH on mechanical properties of films were
examined. The tensile strength (TS) of films vastly decreased with increasing sorbitol concentration. The
percentage of elongation increased significantly with increasing sorbitol content; however, it declined
when sorbitol content was above 40 g/100 g. Modulus of elasticity (E) of films displayed a similar trend to
TS. The E of this film was inversely linear to RH, whereas its elongation was exponentially proportional to
RH. Effects of sorbitol concentration on barrier properties of films were also examined. The water vapor
transmission rate of film was gradually reduced with increasing sorbitol content; however, it dropped
dramatically with sorbitol content above 40 g/100 g. The oxygen transmission rate of film significantly
decreased with rising sorbitol content. This is helpful in understanding the performance of edible films
under varying RH conditions and plasticizer contents.