Accession Number : ADA615449


Title :   Hansen Solubility Parameters for Octahedral Oligomeric Silsesquioxanes


Descriptive Note : Journal article preprint


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA ROCKET PROPULSION DIV


Personal Author(s) : Guenthner, Andrew J ; Lamison, Kevin R ; Lubin, Lisa M ; Haddad, Timothy S ; Mabry, Joseph M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a615449.pdf


Report Date : 28 Aug 2012


Pagination or Media Count : 50


Abstract : The Hansen Solubility Parameters (HSP) for several polyhedral oligomeric silsesquioxane (POSS) compounds were successfully determined, demonstrating the applicability of the HSP approach for selected types of organic-inorganic compounds. As commonly practiced with organic polymers, a set of simple pass/fail tests for complete solubility at a fixed concentration (100 mg/mL) was conducted for an array of five octameric POSS compounds, octa(phenethyl), octa(styrenyl), octa(isobutyl), octakis(hexafluoroisobutyl), and (1-naphthyl)heptaphenyl), and 45 test solvents. Group contributions for the octameric POSS cage were determined using three different approaches, which produced similar results. The best cage contribution estimate for the dispersive, polar, and hydrogen-bonding components deltaD, dletaP,, and deltaH of the total solubility parameter was determined to be deltaD = 22 (J/cc)1/2, dletaP = 19 (J/cc)1/2, and delta = 15 (J/cc)1/2, with an estimated uncertainty of approximately 5 (J/cc)1/2. The utility of the HSP approach was demonstrated by successfully identifying mixtures of poor solvents that provided significantly enhanced solubility for octa(isobutyl) POSS, and by successfully estimating the HSP of octakis(trifluoropropyl) POSS from group contributions derived solely from aromatic POSS compounds.


Descriptors :   *POLYMERS , CHEMICAL ENGINEERING , SOLVENTS


Subject Categories : Industrial Chemistry and Chemical Processing
      Physical Chemistry
      Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE