Matches in SemOpenAlex for { <https://semopenalex.org/work/W2201762188> ?p ?o ?g. }
Showing items 1 to 83 of
83
with 100 items per page.
- W2201762188 abstract "Supercritical fluids are becoming an attractive alternative to the liquid solvents traditionally used as polymerization media. As the synthesis proceeds, a wide range of colloidal aggregates form, but there has hitherto been no way to measure such structures directly. We have applied small-angle neutron scattering (SANS) to characterize such systems, and although SCF polymerizations are carried out at high pressures, the penetrating power of the neutron beam means that typical cell windows are virtually transparent. Systems studied include molecules soluble in CO{sub 2} (e.g. polyfluoro-octyl acrylate or PFOA) and this polymer has previously been shown to exhibit a positive second virial coefficient (A{sub 2}). Other CO{sub 2}-soluble polymers include hexafluoro-polypropylene oxide (HFPPO), which appears to have a second virial coefficient which is close to zero (10{sup 4}A{sub 2} {approx_equal} 0 +{+-} 0.2 cm{sup 3} g{sup -2} mol). Polydimethylsiloxane (PDMS), is soluble on the molecular level only in the limit of dilute solution and seems to form aggregates as the concentration increases (c > 0.01 g cm{sup -3}). Other polymers (e.g. polystyrene) are insoluble in CO{sub 2}, though polymerizations may be accomplished via the use of PS-PFOA blockcopolymer stabilizers, which are also amenable to SANS characterization, and have been shown to form micelles in CO{sub 2}. Other amphiphilic surfactant molecules that form micelles include PFOA-polyethylene oxide (PFOA-PEO) graft copolymers, which swell as the CO{sub 2} medium is saturated with water. These systems have been characterized by SANS, by taking advantage of the different contrast options afforded by substituting D{sub 2}O for H{sub 2}O. This paper illustrates the utility of SANS to measure molecular dimensions, thermodynamic variables, molecular weights, micelle structures etc. in supercritical CO{sub 2}." @default.
- W2201762188 created "2016-06-24" @default.
- W2201762188 creator A5035212172 @default.
- W2201762188 creator A5036589442 @default.
- W2201762188 creator A5081273286 @default.
- W2201762188 date "1995-12-31" @default.
- W2201762188 modified "2023-09-27" @default.
- W2201762188 title "Neutron scattering characterization of homopolymers and graft-copolymer micelles in supercritical carbon dioxide" @default.
- W2201762188 hasPublicationYear "1995" @default.
- W2201762188 type Work @default.
- W2201762188 sameAs 2201762188 @default.
- W2201762188 citedByCount "0" @default.
- W2201762188 crossrefType "journal-article" @default.
- W2201762188 hasAuthorship W2201762188A5035212172 @default.
- W2201762188 hasAuthorship W2201762188A5036589442 @default.
- W2201762188 hasAuthorship W2201762188A5081273286 @default.
- W2201762188 hasConcept C104015590 @default.
- W2201762188 hasConcept C11268172 @default.
- W2201762188 hasConcept C118419359 @default.
- W2201762188 hasConcept C120665830 @default.
- W2201762188 hasConcept C121332964 @default.
- W2201762188 hasConcept C127413603 @default.
- W2201762188 hasConcept C132841051 @default.
- W2201762188 hasConcept C134458231 @default.
- W2201762188 hasConcept C147789679 @default.
- W2201762188 hasConcept C15920480 @default.
- W2201762188 hasConcept C178790620 @default.
- W2201762188 hasConcept C184651966 @default.
- W2201762188 hasConcept C185592680 @default.
- W2201762188 hasConcept C188027245 @default.
- W2201762188 hasConcept C191486275 @default.
- W2201762188 hasConcept C192562407 @default.
- W2201762188 hasConcept C2777922577 @default.
- W2201762188 hasConcept C42360764 @default.
- W2201762188 hasConcept C44228677 @default.
- W2201762188 hasConcept C521977710 @default.
- W2201762188 hasConceptScore W2201762188C104015590 @default.
- W2201762188 hasConceptScore W2201762188C11268172 @default.
- W2201762188 hasConceptScore W2201762188C118419359 @default.
- W2201762188 hasConceptScore W2201762188C120665830 @default.
- W2201762188 hasConceptScore W2201762188C121332964 @default.
- W2201762188 hasConceptScore W2201762188C127413603 @default.
- W2201762188 hasConceptScore W2201762188C132841051 @default.
- W2201762188 hasConceptScore W2201762188C134458231 @default.
- W2201762188 hasConceptScore W2201762188C147789679 @default.
- W2201762188 hasConceptScore W2201762188C15920480 @default.
- W2201762188 hasConceptScore W2201762188C178790620 @default.
- W2201762188 hasConceptScore W2201762188C184651966 @default.
- W2201762188 hasConceptScore W2201762188C185592680 @default.
- W2201762188 hasConceptScore W2201762188C188027245 @default.
- W2201762188 hasConceptScore W2201762188C191486275 @default.
- W2201762188 hasConceptScore W2201762188C192562407 @default.
- W2201762188 hasConceptScore W2201762188C2777922577 @default.
- W2201762188 hasConceptScore W2201762188C42360764 @default.
- W2201762188 hasConceptScore W2201762188C44228677 @default.
- W2201762188 hasConceptScore W2201762188C521977710 @default.
- W2201762188 hasLocation W22017621881 @default.
- W2201762188 hasOpenAccess W2201762188 @default.
- W2201762188 hasPrimaryLocation W22017621881 @default.
- W2201762188 hasRelatedWork W1610304632 @default.
- W2201762188 hasRelatedWork W1975700348 @default.
- W2201762188 hasRelatedWork W1977283071 @default.
- W2201762188 hasRelatedWork W1994079669 @default.
- W2201762188 hasRelatedWork W2011411731 @default.
- W2201762188 hasRelatedWork W2013447988 @default.
- W2201762188 hasRelatedWork W2060234114 @default.
- W2201762188 hasRelatedWork W2067953147 @default.
- W2201762188 hasRelatedWork W2072440840 @default.
- W2201762188 hasRelatedWork W2095318098 @default.
- W2201762188 hasRelatedWork W2103280048 @default.
- W2201762188 hasRelatedWork W2107974138 @default.
- W2201762188 hasRelatedWork W2163356530 @default.
- W2201762188 hasRelatedWork W2329452180 @default.
- W2201762188 hasRelatedWork W3135186473 @default.
- W2201762188 hasRelatedWork W3194938528 @default.
- W2201762188 hasRelatedWork W3206867621 @default.
- W2201762188 hasRelatedWork W594511032 @default.
- W2201762188 hasRelatedWork W830948394 @default.
- W2201762188 hasRelatedWork W2314683588 @default.
- W2201762188 isParatext "false" @default.
- W2201762188 isRetracted "false" @default.
- W2201762188 magId "2201762188" @default.
- W2201762188 workType "article" @default.