title: Characterization of starch films containing starch nanoparticles. Part 2: viscoelasticity and creep properties.
abstract: Starch films were successfully produced by incorporating spray dried and vacuum-freeze dried starch nanoparticles. The frequency sweep, creep-recovery behavior and time-temperature superposition (TTS) on these films were studied. All these films exhibited dominant elastic behavior (than viscous behavior) over the entire frequency range (0.1-100 rad/s). The incorporation of both types of starch nanoparticles increased the storage and loss modulus, tanδ, creep strain, creep compliance and creep rate at long time frame and reduced the recovery rate of films while the effect of different kinds of starch nanoparticles on these parameters was similar both in magnitude and trend. TTS method was successfully used to predict long time (over 20 days) creep behavior through the master curves. The addition of these nanoparticles could increase the activation energy parameter used in TTS master curves. Power law and Burger's models were capable of fitting storage and loss modulus (R(2)>0.79) and creep data (R(2)>0.96), respectively.
authors.affiliation: College of Engineering, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, China.
authors.forename: Ai-Min
authors.initials: AM
authors.lastname: Shi
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Wang
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.forename: Benu
authors.initials: B
authors.lastname: Adhikari
mesh_terms: D004548:Elasticity; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D055682:Viscoelastic Substances / Q000737:chemistry*; D014783:Viscosity
chemical_list: D055682:Viscoelastic Substances; D013213:Starch