High-Pressure NMR of Polymers Dissolved in Supercritical Carbon Dioxide
High-pressure, high-resolution proton nuclear magnetic resonance spectroscopy has been utilized to study the solution behavior of poly(1,1-dihydroperfluorooctyl acrylate) (PFOA) and poly(1,1-dihydroperfluorooctyl acrylate-block-styrene) (PFOA-b-PS) in supercritical carbon dioxide. The proton chemica...
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| Veröffentlicht in: | Macromolecules 1997-06, Vol.30 (12), p.3593-3599 |
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| container_title | Macromolecules |
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| creator | Dardin, Alexander Cain, J. B DeSimone, J. M Johnson, C. S Samulski, E. T |
| description | High-pressure, high-resolution proton nuclear magnetic resonance spectroscopy has been utilized to study the solution behavior of poly(1,1-dihydroperfluorooctyl acrylate) (PFOA) and poly(1,1-dihydroperfluorooctyl acrylate-block-styrene) (PFOA-b-PS) in supercritical carbon dioxide. The proton chemical shift was monitored as a function of solvent density and temperature. A change in the solvent quality of CO2 from that of a poor solvent to that of a good solvent is postulated to describe a discontinuous change in the 1H NMR spectra of the polymers with increasing CO2 density and increasing temperature. At a CO2 density of 0.7 g cm-3 at 64.6 °C (0.8 g cm-3 at 41.2 °C) there is an apparent transition between a two-phase systemthe coexistence of two polymer species in different environmentsand a homogeneous solution. The volume fraction of CO2 in the polymer-rich phase is estimated from the proton chemical shift and the contributions from the bulk susceptibilities of PFOA and PFOA-b-PS. |
| doi_str_mv | 10.1021/ma961917e |
| format | Article |
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At a CO2 density of 0.7 g cm-3 at 64.6 °C (0.8 g cm-3 at 41.2 °C) there is an apparent transition between a two-phase systemthe coexistence of two polymer species in different environmentsand a homogeneous solution. The volume fraction of CO2 in the polymer-rich phase is estimated from the proton chemical shift and the contributions from the bulk susceptibilities of PFOA and PFOA-b-PS.</description><identifier>ISSN: 0024-9297</identifier><identifier>EISSN: 1520-5835</identifier><identifier>DOI: 10.1021/ma961917e</identifier><identifier>CODEN: MAMOBX</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Applied sciences ; Exact sciences and technology ; Organic polymers ; Physicochemistry of polymers ; Properties and characterization ; Solution and gel properties</subject><ispartof>Macromolecules, 1997-06, Vol.30 (12), p.3593-3599</ispartof><rights>Copyright © 1997 American Chemical Society</rights><rights>1997 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a324t-91ee2d7e5ad717d884f84c6a70a6285c1a0d1d45c36ab3ac2908917388ffdc8b3</citedby><cites>FETCH-LOGICAL-a324t-91ee2d7e5ad717d884f84c6a70a6285c1a0d1d45c36ab3ac2908917388ffdc8b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/ma961917e$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/ma961917e$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2700718$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Dardin, Alexander</creatorcontrib><creatorcontrib>Cain, J. 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At a CO2 density of 0.7 g cm-3 at 64.6 °C (0.8 g cm-3 at 41.2 °C) there is an apparent transition between a two-phase systemthe coexistence of two polymer species in different environmentsand a homogeneous solution. The volume fraction of CO2 in the polymer-rich phase is estimated from the proton chemical shift and the contributions from the bulk susceptibilities of PFOA and PFOA-b-PS.</description><subject>Applied sciences</subject><subject>Exact sciences and technology</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Properties and characterization</subject><subject>Solution and gel properties</subject><issn>0024-9297</issn><issn>1520-5835</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNpt0DtPwzAQAGALgUQpDPyDDDAwGPyIY2dEBVJEgYiW2braDrikSWW3qP33BAV1YrrhvnsidE7JNSWM3iwhz2hOpTtAAyoYwUJxcYgGhLAU5yyXx-gkxgUhlIqUD1Ax9h-fuAwuxk1wycvzW9JWSdnWu6ULMbnzMbb1t7OJb5LpZuWCCX7tDdTJCMK8bTrRbr11p-iogjq6s784RO8P97PRGE9ei8fR7QQDZ-ka59Q5ZqUTYCWVVqm0UqnJQBLImBKGArHUpsLwDOYcDMuJ6q7hSlWVNWrOh-iq72tCG2NwlV4Fv4Sw05To3w_o_Qc6e9HbFcRu4ypAY3zcFzBJiKSqY7hnPq7ddp-G8KUzyaXQs3KqOSuecjErddH5y96DiXrRbkLTHfzP-B-dfXV5</recordid><startdate>19970616</startdate><enddate>19970616</enddate><creator>Dardin, Alexander</creator><creator>Cain, J. 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T</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High-Pressure NMR of Polymers Dissolved in Supercritical Carbon Dioxide</atitle><jtitle>Macromolecules</jtitle><addtitle>Macromolecules</addtitle><date>1997-06-16</date><risdate>1997</risdate><volume>30</volume><issue>12</issue><spage>3593</spage><epage>3599</epage><pages>3593-3599</pages><issn>0024-9297</issn><eissn>1520-5835</eissn><coden>MAMOBX</coden><abstract>High-pressure, high-resolution proton nuclear magnetic resonance spectroscopy has been utilized to study the solution behavior of poly(1,1-dihydroperfluorooctyl acrylate) (PFOA) and poly(1,1-dihydroperfluorooctyl acrylate-block-styrene) (PFOA-b-PS) in supercritical carbon dioxide. The proton chemical shift was monitored as a function of solvent density and temperature. A change in the solvent quality of CO2 from that of a poor solvent to that of a good solvent is postulated to describe a discontinuous change in the 1H NMR spectra of the polymers with increasing CO2 density and increasing temperature. At a CO2 density of 0.7 g cm-3 at 64.6 °C (0.8 g cm-3 at 41.2 °C) there is an apparent transition between a two-phase systemthe coexistence of two polymer species in different environmentsand a homogeneous solution. The volume fraction of CO2 in the polymer-rich phase is estimated from the proton chemical shift and the contributions from the bulk susceptibilities of PFOA and PFOA-b-PS.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/ma961917e</doi><tpages>7</tpages></addata></record> |
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| language | eng |
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| source | American Chemical Society Journals |
| subjects | Applied sciences Exact sciences and technology Organic polymers Physicochemistry of polymers Properties and characterization Solution and gel properties |
| title | High-Pressure NMR of Polymers Dissolved in Supercritical Carbon Dioxide |
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