Diffusion in Polymer Melts
{'Code': '03070007', 'Directorate': {'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'LongName': 'Division Of Materials Research'}}
{'SignBlockName': None}
Forward recoil spectrometry (FRES) will be used to determine               the concentration versus depth profiles of deuterated polymers                  diffusing into undeuterated ones or vice versa.  The importance                 of molecular topology will be explored by investigating the                     diffusion of polystyrene (PS) stars with various arm numbers into               matrices consisting of the following: linear PS of various                      molecular weights, PS microgels and gamma-irradiation crosslinked               PS, and PS stars.  Results will be compared with current theories               of the matrix-independent and matrix-dependent diffusion of                     stars.  Experiments will be initiated to follow the diffusion of                block copolymers of polystyrene and poly(vinylpyridine) into                    block copolymer matrices to determine the role of the morphology                of the matrix on the diffusion.  These experiments will be                      interpreted in terms of the trapping of the minor block by the                  domain structure of this block.  In miscible polymer blends,                    emphasis will be placed on determining the tracer diffusion                     behavior of the two components in binary polymer blends and on                  determining the enhancement of the mutual diffusion coefficient                 due to the square gradient term in the free energy.  Measurements               of the mutual diffusion coefficient will also permit a sensitive                determination of the negative Flory parameter for the blend.                    Finally experiments will be initiated to measure the diffusion of               macromolecules along surfaces, i.e., in two dimensions.  The                    results of all these experiments will be interpreted in terms of                current theory.
{'FirstName': 'Edward', 'LastName': 'Kramer', 'EmailAddress': 'edkramer@mrl.ucsb.edu', 'StartDate': '03/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Cornell University', 'CityName': 'Ithaca', 'ZipCode': '148502820', 'PhoneNumber': '6072555014', 'StreetAddress': '373 Pine Tree Road', 'CountryName': 'United States', 'StateName': 'New York', 'StateCode': 'NY'}
{'Code': '1773', 'Text': 'POLYMERS'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8719123.xml'}