Metal-solvating and self-association of amphiphilic polyamides containing poly(oxyethylene) blocks
Journal
Journal of Applied Polymer Science
Journal Volume
85
Journal Issue
3
Pages
612-621
Date Issued
2002
Author(s)
Abstract
An amphiphilic poly(ether amide) consisting of hydrophilic poly(oxyethylene) amide blocks was prepared from the copolymerization of sebacic acid and two poly(oxyalkylene) diamines including a poly(oxyethylene) diamine (POE-amine at 2000 Mω) and a poly(oxypropylene) diamine (POP-amine at 230 Mω). The copolymer was estimated to have an average molecular weight of 15,000 Mω (GPC) or approximately three hydrophilic POE segments per strain. The presence of POE segments rendered polymer hydrophilicity and complexing ability for Li+, K+, Ca+2, Ni+2, Pd+2, and Cu+2 salts. In particular, lithium perchlorate affected the copolymer to the greatest extent in enhancing electrostatic dissipation or reducing surface resistivity as low as 105.0 Ω/sq (cross-sectional area) at 1/180 Li+/EO from 107.2 Ω/sq (without metal ion). In such a metal complexation, the copolymer showed a new POE segmental crystalline phase at a melting temperature between -10.4 and -14°C, accompanied with the metal-free original phase of -31°C. In static toluene/water, the metal ions had no effect on the copolymer surfactancy in lowering the interfacial tension, reaching 4.4 dyn/cm at a critical micelle concentration (cmc) of 0.01 wt %. When mixing toluene and water, the lithium or nickel ions were found to be detrimental to the emulsifying process. Without the metal ion, fine droplets at average sizes of 4.5-5.0 μm were observed in the copolymer/toluene/water emulsification. These amphiphilic behaviors of the POE-segmented polyamide with or without metal ions were explained by the competing noncovalent bonding interactions among POE/metal ion/water. © 2002 Wiley Periodicals, Inc. J. Appl. Polym. Sci.
SDGs
Type
journal article