Humidity-induced structural transitions in amylose and amylopectin films

Effects of drying temperature and relative humidity on the mechanical properties of amaranth flour films plasticized with glycerol

“…As observed by Rindlav-Westling et al (1998) and Stading et al (2001), during drying at 23 o C, the crystallinity of amylose films changed slightly, whereas the crystallinity of amylopectin films experienced a sharp increase as a function of RH as higher relative humidities imply longer drying times. The tensile stress of amylopectin film depends on crystallinity, so a continuous increase in RH will be accompanied by a decrease in elongation.…”

“…Little research on starch and protein raw materials can be cited. The effect of air-drying temperature and relative humidity on the mechanical and barrier properties of amylopectin and amylose films was studied by Rindlav-Wetsling et al (1998), Stading et al (2001) and Göritz (1994a, 1994b). Changes in crystallinity and mechanical properties were measured as a function of amylose or amylopectin content, relative humidity (RH) and temperature.…”

Influence of kaolin addition on the dynamics of oxygen mass transport in polyvinyl alcohol dispersion coatings

“…In other polymer matrices, such as amylose and starch, it has been shown that humidity can induce phase changes in the material (Stading et al 2001, Masclaux et al 2010. The water molecules diffuse mainly through the amorphous regions and attach to the hydroxyl side group of PVOH, and can dissolve the crystalline regions at ambient temperature (Hodge et al 1996).…”

Rice Starch-Based Biodegradable Films: Properties Enhancement

“…As a consequence, free volume increases which affects their mechanical properties. Stading et al (2001) studied the effect of relative humidity on amylose and amylopectin film properties. They found that when the relative humidity of surrounding films increase this yielded increasing water content and oxygen permeability.…”