Accession Number : ADA334680
Title : Specific Interactions in Polyurethane Cationomers
Descriptive Note : Final rept.
Corporate Author : AIR FORCE RESEARCH LAB BOLLING AFB DC
Personal Author(s) : Goddard, Richard J.
PDF Url : ADA334680
Report Date : 1994
Pagination or Media Count : 189
Abstract : Studies have shown that addition of cationic groups to a segmented polyurethane can dramatically change physical attributes such as solution behavior, mechanical strength, and viscoelastic properties. However, the specific interactions responsible for these changes are not well understood. A series of polyether polyurethane cationomers were synthesized using chain extenders with pendant trialkylammonium groups. The morphology and properties of the cationomers were studied as a function of ion-related variables using small-angle X-ray scattering (SAXS),tensile testing, dynamic mechanical thermal analysis (DMTA), and differential scanning calorimetry (DSC). Ion content affected phase separation and mechanical properties the most; the alkyl group length was of secondary importance; and the type of neutralizing anion had essentially no effect. Further, a lamellar microstructure typical of conventional polyurethanes was evident, with no apparent aggregation of ionic groups.
Descriptors : *CATIONS, *POLYMERS, IONS, MECHANICAL PROPERTIES, MICROSTRUCTURE, SOLUTIONS(MIXTURES), INTERACTIONS, VISCOELASTICITY, NEUTRALIZATION, ELASTOMERS, THESES, STRENGTH(MECHANICS), PHASE, THERMAL ANALYSIS, X RAY SCATTERING, SEPARATION, ANIONS, TENSILE TESTERS, ALKYL RADICALS, POLYETHERS, CALORIMETRY, URETHANES.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE