FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2216553789> ?p ?o ?g. }

• W2216553789 abstract "The design of environmentally-benign polymer processing techniques is an area of growing interest, motivated by the desire to reduce the emission of volatile organic compounds. Recently, supercritical carbon dioxide (scCO2) has gained traction as a viable candidate to process polymers both as a solvent and diluent. The focus of this work was to elucidate the nature of the interactions between scCO2 and polymers in order to provide rational insight into the molecular interactions which result in the unexpected mixing thermodynamics in one such system. The work also provides insight into the nature of pairwise thermodynamic interactions in multicomponent polymer-polymer-diluent blends, and the effect of these interactions on the phase behavior of the mixture. In order to quantify the strength of interactions in the multicomponent system, the binary mixtures were characterized individually in addition to the ternary blend. Quantitative analysis of was made tractable through the use of a model miscible polymer blend containing styrene-acrylonitrile copolymer (SAN) and poly(methyl methacrylate) (dPMMA), a mixture which has been considered for a variety of practical applications. In the case of both individual polymers, scCO2 is known to behave as a diluent, wherein the extent of polymer swelling depends on both temperature and pressure. The solubility of scCO2 in each polymer as a function of temperature and pressure was characterized elsewhere. The SAN-dPMMA blend clearly exhibited lower critical solution temperature behavior, forming homogeneous mixtures at low temperatures and phase separating at elevated temperature. These measurements allowed the determination of the Flory-Huggins interaction parameter c23 for SAN (species 2) and dPMMA (species 3) as a function of temperature at ambient pressure, in the absence of scCO2 (species 1).Characterization of the phase behavior of the multicomponent (ternary) mixture was also carried out by SANS. An in situ SANS environment was developed to allow measurement of blend miscibility in the presence of scCO2. The pressure-temperature phase behavior of the system could be mapped by approaching the point of phase separation by spinodal decomposition through pressure increases at constant temperature. For a roughly symmetric mixture of SAN and dPMMA, the temperature at which phase separation occurred could be decreased by over 125 °C. The extent to which the phase behavior of the multicomponent system could be tuned motivated further investigation into the interactions present within the homogeneous mixtures. Analysis of the SANS results for homogeneous mixtures was undertaken using a new multicomponent formalism of the random phase approximation theory. The scattering profiles obtained from the scCO2-SAN-dPMMA system could be predicted with reasonable success. The success of the theoretical predictions was facilitated by directly employing the interactions found in the binary experiments. Exploitation of the condition of homogeneity with respect to chemical potential allowed determination of interaction parameters for scCO2-SAN and 2-dPMMA within the multicomponent mixture (c12 and c13, respectively). Studying this system over a large range of the supercritical regime yielded insight on the nature of interactions in the system. Near the critical point of scCO2, c12 and c13 increase monotonically as a function of pressure. Conversely, at elevated temperature away from the critical point, the interaction parameters are found to go through a minimum as a pressure increases. Analysis of the critical phenomenon associated with scCO2 suggests that the observed dependence of c12 and c13 on pressure are related to the magnitude of scCO2 density fluctuations and the proximity of the system to the so-called density fluctuation ridge. By tuning the system parameters of the multicomponent mixture, the phase behavior can be altered through the balance of pairwise interactions been the constituent species. The presence of scCO2 in the mixtures appears to eliminate the existence of the metastable state that epitomizes most polymer-polymer mixtures. Thus it is shown that knowledge of the individual pairwise interactions in such multicomponent mixtures can greatly influence the resulting phase behavior, and provide insight into the design of improved functional materials with decreased environmental impacts." @default.
• W2216553789 created "2016-06-24" @default.
• W2216553789 creator A5077721541 @default.
• W2216553789 date "2014-01-01" @default.
• W2216553789 modified "2023-09-27" @default.
• W2216553789 title "Thermodynamics and Phase Behavior of Miscible Polymer Blends in the Presence of Supercritical Carbon Dioxide" @default.
• W2216553789 cites W108961802 @default.
• W2216553789 cites W110465765 @default.
• W2216553789 cites W1505352099 @default.
• W2216553789 cites W2097246107 @default.
• W2216553789 cites W343062540 @default.
• W2216553789 cites W348444585 @default.
• W2216553789 cites W82322514 @default.
• W2216553789 hasPublicationYear "2014" @default.
• W2216553789 type Work @default.
• W2216553789 sameAs 2216553789 @default.
• W2216553789 citedByCount "0" @default.
• W2216553789 crossrefType "journal-article" @default.
• W2216553789 hasAuthorship W2216553789A5077721541 @default.
• W2216553789 hasConcept C110884469 @default.
• W2216553789 hasConcept C118419359 @default.
• W2216553789 hasConcept C121332964 @default.
• W2216553789 hasConcept C122247533 @default.
• W2216553789 hasConcept C127413603 @default.
• W2216553789 hasConcept C131847037 @default.
• W2216553789 hasConcept C134458231 @default.
• W2216553789 hasConcept C155574463 @default.
• W2216553789 hasConcept C15920480 @default.
• W2216553789 hasConcept C159985019 @default.
• W2216553789 hasConcept C175804951 @default.
• W2216553789 hasConcept C178790620 @default.
• W2216553789 hasConcept C185592680 @default.
• W2216553789 hasConcept C187404810 @default.
• W2216553789 hasConcept C188027245 @default.
• W2216553789 hasConcept C188109995 @default.
• W2216553789 hasConcept C192562407 @default.
• W2216553789 hasConcept C199360897 @default.
• W2216553789 hasConcept C41008148 @default.
• W2216553789 hasConcept C42360764 @default.
• W2216553789 hasConcept C44280652 @default.
• W2216553789 hasConcept C521977710 @default.
• W2216553789 hasConcept C64452783 @default.
• W2216553789 hasConcept C97355855 @default.
• W2216553789 hasConcept C98765843 @default.
• W2216553789 hasConceptScore W2216553789C110884469 @default.
• W2216553789 hasConceptScore W2216553789C118419359 @default.
• W2216553789 hasConceptScore W2216553789C121332964 @default.
• W2216553789 hasConceptScore W2216553789C122247533 @default.
• W2216553789 hasConceptScore W2216553789C127413603 @default.
• W2216553789 hasConceptScore W2216553789C131847037 @default.
• W2216553789 hasConceptScore W2216553789C134458231 @default.
• W2216553789 hasConceptScore W2216553789C155574463 @default.
• W2216553789 hasConceptScore W2216553789C15920480 @default.
• W2216553789 hasConceptScore W2216553789C159985019 @default.
• W2216553789 hasConceptScore W2216553789C175804951 @default.
• W2216553789 hasConceptScore W2216553789C178790620 @default.
• W2216553789 hasConceptScore W2216553789C185592680 @default.
• W2216553789 hasConceptScore W2216553789C187404810 @default.
• W2216553789 hasConceptScore W2216553789C188027245 @default.
• W2216553789 hasConceptScore W2216553789C188109995 @default.
• W2216553789 hasConceptScore W2216553789C192562407 @default.
• W2216553789 hasConceptScore W2216553789C199360897 @default.
• W2216553789 hasConceptScore W2216553789C41008148 @default.
• W2216553789 hasConceptScore W2216553789C42360764 @default.
• W2216553789 hasConceptScore W2216553789C44280652 @default.
• W2216553789 hasConceptScore W2216553789C521977710 @default.
• W2216553789 hasConceptScore W2216553789C64452783 @default.
• W2216553789 hasConceptScore W2216553789C97355855 @default.
• W2216553789 hasConceptScore W2216553789C98765843 @default.
• W2216553789 hasLocation W22165537891 @default.
• W2216553789 hasOpenAccess W2216553789 @default.
• W2216553789 hasPrimaryLocation W22165537891 @default.
• W2216553789 hasRelatedWork W1503072116 @default.
• W2216553789 hasRelatedWork W1965789097 @default.
• W2216553789 hasRelatedWork W1974350620 @default.
• W2216553789 hasRelatedWork W1980915912 @default.
• W2216553789 hasRelatedWork W1986562252 @default.
• W2216553789 hasRelatedWork W2015720811 @default.
• W2216553789 hasRelatedWork W2018241183 @default.
• W2216553789 hasRelatedWork W2021759217 @default.
• W2216553789 hasRelatedWork W2054331436 @default.
• W2216553789 hasRelatedWork W2063509013 @default.
• W2216553789 hasRelatedWork W2091743139 @default.
• W2216553789 hasRelatedWork W2123779291 @default.
• W2216553789 hasRelatedWork W2126900302 @default.
• W2216553789 hasRelatedWork W2137927764 @default.
• W2216553789 hasRelatedWork W2318933353 @default.
• W2216553789 hasRelatedWork W240149211 @default.
• W2216553789 hasRelatedWork W2483605961 @default.
• W2216553789 hasRelatedWork W3097317582 @default.
• W2216553789 hasRelatedWork W589874998 @default.
• W2216553789 hasRelatedWork W9394956 @default.
• W2216553789 isParatext "false" @default.
• W2216553789 isRetracted "false" @default.
• W2216553789 magId "2216553789" @default.
• W2216553789 workType "article" @default.