title: Rheological characterization of solutions and thin films made from amylose-hexadecylammonium chloride inclusion complexes and polyvinyl alcohol.
abstract: The rheological properties of aqueous solutions and films made from blends of polyvinyl alcohol (PVOH) and amylose-hexadecylammonium chloride inclusion complexes (Hex-Am) were investigated to better understand the polymer interactions and processing parameters. Aqueous solutions of Hex-Am displayed non-Newtonian shear thinning characteristics, becoming highly viscous at 4.2% solids and forming a strong mechanical gel at 10% solids. Cationic Hex-Am was observed to have dramatically different rheological temperature response profiles from anionic amylose-sodium palmitate inclusion complexes, displaying a precipitous increase in viscosity upon cooling from 95°C to 50°C. Aqueous solution blends of 1:1 PVOH/Hex-Am lack this precipitous increase in viscosity, indicating that PVOH reduces amylose-chain entanglement. Films cast from varying blends of Hex-Am and PVOH were thermostable to 200°C, and displayed decreasing storage modulus with increasing concentrations of PVOH in film blends. Films cast from Hex-Am/PVOH absorb water vapor at lower rates than their constitutive polymers.
authors.affiliation: Plant Polymer Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N, University Street, Peoria, IL 61604, USA.
authors.forename: William T
authors.initials: WT
authors.lastname: Hay
authors.affiliation: Functional Foods Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N, University Street, Peoria, IL 61604, USA.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Byars
authors.affiliation: Plant Polymer Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N, University Street, Peoria, IL 61604, USA.
authors.forename: George F
authors.initials: GF
authors.lastname: Fanta
authors.affiliation: Plant Polymer Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N, University Street, Peoria, IL 61604, USA. Electronic address: gordon.selling@ars.usda.gov.
authors.forename: Gordon W
authors.initials: GW
authors.lastname: Selling
mesh_terms: D000643:Ammonium Chloride / Q000737:chemistry*; D000688:Amylose / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012996:Solutions; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D012996:Solutions; D000643:Ammonium Chloride; D014867:Water; D011142:Polyvinyl Alcohol; D000688:Amylose
keywords: Amylose complex; Composite films; DMA; Polyvinyl alcohol; Starch rheology