Rheological characterization of solutions and thin films made from amylose-hexadecylammonium chloride inclusion complexes and polyvinyl alcohol. (1st April 2017)

• Record Type: Journal Article
• Authors: Hay, William T.; Byars, Jeffrey A.; Fanta, George F.; Selling, Gordon W.
• Is Part Of: Carbohydrate polymers. Volume 161(2017)
• Page Start: 140
• Page End: 148
• Publication Date: 2017-04-01
• Subjects: Amylose complex -- Starch rheology -- Polyvinyl alcohol -- Composite films -- DMA; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.01.011
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Characterized solution properties of amylose-lipid salt complexes with PVOH. Lipid head group dramatically alters solution viscosity with temperature. Amylose-lipid salt complexes form gels depending on solution pH. Composite films remain intact and stable to 200 °C. 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.