Accession Number : ADA265584


Title :   Copolymers for Drag Reduction in Marine Propulsion: New Molecular Structures with Enhanced Effectiveness


Descriptive Note : Annual rept. 1 Jun 92-31 May 93,


Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE


Personal Author(s) : McCormick, Charles L ; Hester, Roger D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265584.pdf


Report Date : 31 May 1993


Pagination or Media Count : 51


Abstract : Responsive synthetic copolymers have been tailored with specific microstructural features in order to elucidate drag reduction behavior in aqueous media. Our studies have clearly shown the role of the polymer on ordering of solvent in the vicinity of the macromolecular coil. Specific 'runs' of hydrophobic units spaced by hydrophilic units are necessary for macrophase organization in aqueous media. We have prepared pH- and salt-responsive drag reducing systems based on zwitterionic and ionic polymer structures which have the best drag reducing properties reported to date. The copolymers of acrylamide with 3-(2-acrylamido-2-methylpropanedimethylammonio)-1-propane sulfonate (AMPDAPS) showed the highest drag reduction efficiency as measured by a rotating disk apparatus. The polymer can be prepared by inverse emulsion or microemulsion techniques for repaid dispersion.


Descriptors :   *COPOLYMERS , *MARINE PROPULSION , *DRAG REDUCTION , IONS , COILS , MICROSTRUCTURE , PHASE , SOLVENTS , MOLECULAR STRUCTURE , DISKS , ROTATION , EMULSIONS , DISPERSIONS , PROPANE , COLLISIONS , PH FACTOR , AMIDES , KINETICS , FLUIDS , SULFONATES , TURBULENCE , METHYL RADICALS , SYNTHESIS


Subject Categories : Physical Chemistry
      Polymer Chemistry
      Marine Engineering
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE