title: Dependence of the mechanical properties of a pullulan film on the preparation temperature.
abstract: The mechanical properties of pullulan films prepared at various temperatures were investigated. The films prepared at high temperatures (40 degrees C and 60 degrees C; H-films) did not show any clear plastic deformation in tensile test, indicating that they were brittle. In contrast, those prepared at low temperatures (4 degrees C, 13 degrees C, and 25 degrees C; L-films) showed such deformation. The latter films had higher values for both tensile strength and elastic modulus than the former, indicating that the L-films were stiffer and more flexible than the H-films. Stretching the L-films clearly showed a shear deformation band inclined at 45 degrees to the stretching direction, indicating that they were amorphous.
authors.affiliation: Research Institute for Advanced Science and Technology (RIAST), Osaka Prefecture University, Sakai, Osaka 599-8570, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Kawahara
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Mizutani
authors.forename: Shiho
authors.initials: S
authors.lastname: Suzuki
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kitamura
authors.forename: Harumi
authors.initials: H
authors.lastname: Fukada
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Yui
authors.forename: Kozo
authors.initials: K
authors.lastname: Ogawa
mesh_terms: D004548:Elasticity; D005936:Glucans / Q000737:chemistry*; D019563:Mechanics; D018583:Pliability; D013696:Temperature; D013718:Tensile Strength
chemical_list: D005936:Glucans; C009109:pullulan