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