Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide
The influence of carbon dioxide (CO2) sorption on the phase behavior of two polystyrene-block-poly(n-alkyl methacrylate) copolymers was studied. One, polystyrene-block-poly(n-hexyl methacrylate), P(S-b-nHMA), exhibits an order−disorder transition (ODT), whereas the other, polystyrene-block-poly(n-bu...
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Veröffentlicht in: | Macromolecules 2003-06, Vol.36 (11), p.4029-4036 |
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description | The influence of carbon dioxide (CO2) sorption on the phase behavior of two polystyrene-block-poly(n-alkyl methacrylate) copolymers was studied. One, polystyrene-block-poly(n-hexyl methacrylate), P(S-b-nHMA), exhibits an order−disorder transition (ODT), whereas the other, polystyrene-block-poly(n-butyl methacrylate), P(S-b-nBMA), exhibits a lower disorder−order transition (LDOT). CO2 sorption increases miscibility of the segments in P(S-b-nHMA) slightly: the ODT is depressed by less than 7 °C at a CO2 fluid density of 0.25 g/cm3, which corresponds to 7 vol % dilation of the copolymer with CO2 at the conditions studied. In contrast, CO2 sorption decreased the miscibility of P(S-b-nBMA) markedly: the LDOT was depressed by more than 70 °C at densities < 0.06 g/cm3, which corresponds to less than 3 vol % sorption of CO2. Unlike P(S-b-nHMA), ordering transitions in CO2-dilated P(S-b-nBMA) exhibit a pronounced thermal hysteresis that increases with increasing volume fraction of sorbed diluent. The hysteresis is a consequence of the sensitivity of the LDOT system to differences in CO2 sorption between the ordered and disordered states, as evidenced by neutron reflectivity measurements. The difference in the effect of CO2 sorption on the phase behavior of the copolymers is attributed to the different nature of the transitions. The entropically driven LDOT is depressed by differential dilation of the copolymer domains, which increases both the compressibility of the system and disparities in compressibility between the blocks. In contrast, the enthalpically driven ODT is depressed by the screening of segmental interactions by CO2 and is less sensitive to compressibility. |
doi_str_mv | 10.1021/ma0300544 |
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One, polystyrene-block-poly(n-hexyl methacrylate), P(S-b-nHMA), exhibits an order−disorder transition (ODT), whereas the other, polystyrene-block-poly(n-butyl methacrylate), P(S-b-nBMA), exhibits a lower disorder−order transition (LDOT). CO2 sorption increases miscibility of the segments in P(S-b-nHMA) slightly: the ODT is depressed by less than 7 °C at a CO2 fluid density of 0.25 g/cm3, which corresponds to 7 vol % dilation of the copolymer with CO2 at the conditions studied. In contrast, CO2 sorption decreased the miscibility of P(S-b-nBMA) markedly: the LDOT was depressed by more than 70 °C at densities < 0.06 g/cm3, which corresponds to less than 3 vol % sorption of CO2. Unlike P(S-b-nHMA), ordering transitions in CO2-dilated P(S-b-nBMA) exhibit a pronounced thermal hysteresis that increases with increasing volume fraction of sorbed diluent. The hysteresis is a consequence of the sensitivity of the LDOT system to differences in CO2 sorption between the ordered and disordered states, as evidenced by neutron reflectivity measurements. The difference in the effect of CO2 sorption on the phase behavior of the copolymers is attributed to the different nature of the transitions. The entropically driven LDOT is depressed by differential dilation of the copolymer domains, which increases both the compressibility of the system and disparities in compressibility between the blocks. In contrast, the enthalpically driven ODT is depressed by the screening of segmental interactions by CO2 and is less sensitive to compressibility.</description><identifier>ISSN: 0024-9297</identifier><identifier>EISSN: 1520-5835</identifier><identifier>DOI: 10.1021/ma0300544</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 ; Thermal and thermodynamic properties</subject><ispartof>Macromolecules, 2003-06, Vol.36 (11), p.4029-4036</ispartof><rights>Copyright © 2003 American Chemical Society</rights><rights>2003 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a325t-c2b8dd687d2ca126f060ed7e250c145fab81660876058885116da2d40f02c3f3</citedby><cites>FETCH-LOGICAL-a325t-c2b8dd687d2ca126f060ed7e250c145fab81660876058885116da2d40f02c3f3</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/ma0300544$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/ma0300544$$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=14867829$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Vogt, Bryan D</creatorcontrib><creatorcontrib>RamachandraRao, Vijayakumar S</creatorcontrib><creatorcontrib>Gupta, Ravi R</creatorcontrib><creatorcontrib>Lavery, Kristopher A</creatorcontrib><creatorcontrib>Francis, Timothy J</creatorcontrib><creatorcontrib>Russell, Thomas P</creatorcontrib><creatorcontrib>Watkins, James J</creatorcontrib><title>Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide</title><title>Macromolecules</title><addtitle>Macromolecules</addtitle><description>The influence of carbon dioxide (CO2) sorption on the phase behavior of two polystyrene-block-poly(n-alkyl methacrylate) copolymers was studied. One, polystyrene-block-poly(n-hexyl methacrylate), P(S-b-nHMA), exhibits an order−disorder transition (ODT), whereas the other, polystyrene-block-poly(n-butyl methacrylate), P(S-b-nBMA), exhibits a lower disorder−order transition (LDOT). CO2 sorption increases miscibility of the segments in P(S-b-nHMA) slightly: the ODT is depressed by less than 7 °C at a CO2 fluid density of 0.25 g/cm3, which corresponds to 7 vol % dilation of the copolymer with CO2 at the conditions studied. In contrast, CO2 sorption decreased the miscibility of P(S-b-nBMA) markedly: the LDOT was depressed by more than 70 °C at densities < 0.06 g/cm3, which corresponds to less than 3 vol % sorption of CO2. Unlike P(S-b-nHMA), ordering transitions in CO2-dilated P(S-b-nBMA) exhibit a pronounced thermal hysteresis that increases with increasing volume fraction of sorbed diluent. The hysteresis is a consequence of the sensitivity of the LDOT system to differences in CO2 sorption between the ordered and disordered states, as evidenced by neutron reflectivity measurements. The difference in the effect of CO2 sorption on the phase behavior of the copolymers is attributed to the different nature of the transitions. The entropically driven LDOT is depressed by differential dilation of the copolymer domains, which increases both the compressibility of the system and disparities in compressibility between the blocks. In contrast, the enthalpically driven ODT is depressed by the screening of segmental interactions by CO2 and is less sensitive to compressibility.</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>Thermal and thermodynamic properties</subject><issn>0024-9297</issn><issn>1520-5835</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNptkDFPwzAQhS0EEqUw8A-yINHBcLZjxx2hQEEqohLdGKyL4yhp06SyAzT_nlRFdGG607vv3ukeIZcMbhhwdrtGEAAyjo_IgEkOVGohj8kAgMd0zMfJKTkLYQnAmIzFgHzMCwwuuncFfpWNj5o8mjdVF9rOu9rRtGrsim565bqmWK26Klq7tkDruwpbNwrRQ7lrsui7bItogj5t6l5rtmXmzslJjlVwF791SBZPj4vJM529TV8mdzOKgsuWWp7qLFM6ybhFxlUOClyWOC7BsljmmGqmFOhEgdRaS8ZUhjyLIQduRS6GZLS3tb4JwbvcbHy5Rt8ZBmYXivkLpWev9uwGg8Uq91jbMhwWYq0Szcc9R_dcGVq3_ZujXxmViESaxfzdvEox5fFMG3HwRRvMsvn0df_wP_d_ADDFe3o</recordid><startdate>20030603</startdate><enddate>20030603</enddate><creator>Vogt, Bryan D</creator><creator>RamachandraRao, Vijayakumar S</creator><creator>Gupta, Ravi R</creator><creator>Lavery, Kristopher A</creator><creator>Francis, Timothy J</creator><creator>Russell, Thomas P</creator><creator>Watkins, James J</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20030603</creationdate><title>Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide</title><author>Vogt, Bryan D ; RamachandraRao, Vijayakumar S ; Gupta, Ravi R ; Lavery, Kristopher A ; Francis, Timothy J ; Russell, Thomas P ; Watkins, James J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a325t-c2b8dd687d2ca126f060ed7e250c145fab81660876058885116da2d40f02c3f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Applied sciences</topic><topic>Exact sciences and technology</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Properties and characterization</topic><topic>Thermal and thermodynamic properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Vogt, Bryan D</creatorcontrib><creatorcontrib>RamachandraRao, Vijayakumar S</creatorcontrib><creatorcontrib>Gupta, Ravi R</creatorcontrib><creatorcontrib>Lavery, Kristopher A</creatorcontrib><creatorcontrib>Francis, Timothy J</creatorcontrib><creatorcontrib>Russell, Thomas P</creatorcontrib><creatorcontrib>Watkins, James J</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Macromolecules</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Vogt, Bryan D</au><au>RamachandraRao, Vijayakumar S</au><au>Gupta, Ravi R</au><au>Lavery, Kristopher A</au><au>Francis, Timothy J</au><au>Russell, Thomas P</au><au>Watkins, James J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide</atitle><jtitle>Macromolecules</jtitle><addtitle>Macromolecules</addtitle><date>2003-06-03</date><risdate>2003</risdate><volume>36</volume><issue>11</issue><spage>4029</spage><epage>4036</epage><pages>4029-4036</pages><issn>0024-9297</issn><eissn>1520-5835</eissn><coden>MAMOBX</coden><abstract>The influence of carbon dioxide (CO2) sorption on the phase behavior of two polystyrene-block-poly(n-alkyl methacrylate) copolymers was studied. One, polystyrene-block-poly(n-hexyl methacrylate), P(S-b-nHMA), exhibits an order−disorder transition (ODT), whereas the other, polystyrene-block-poly(n-butyl methacrylate), P(S-b-nBMA), exhibits a lower disorder−order transition (LDOT). CO2 sorption increases miscibility of the segments in P(S-b-nHMA) slightly: the ODT is depressed by less than 7 °C at a CO2 fluid density of 0.25 g/cm3, which corresponds to 7 vol % dilation of the copolymer with CO2 at the conditions studied. In contrast, CO2 sorption decreased the miscibility of P(S-b-nBMA) markedly: the LDOT was depressed by more than 70 °C at densities < 0.06 g/cm3, which corresponds to less than 3 vol % sorption of CO2. Unlike P(S-b-nHMA), ordering transitions in CO2-dilated P(S-b-nBMA) exhibit a pronounced thermal hysteresis that increases with increasing volume fraction of sorbed diluent. The hysteresis is a consequence of the sensitivity of the LDOT system to differences in CO2 sorption between the ordered and disordered states, as evidenced by neutron reflectivity measurements. The difference in the effect of CO2 sorption on the phase behavior of the copolymers is attributed to the different nature of the transitions. The entropically driven LDOT is depressed by differential dilation of the copolymer domains, which increases both the compressibility of the system and disparities in compressibility between the blocks. In contrast, the enthalpically driven ODT is depressed by the screening of segmental interactions by CO2 and is less sensitive to compressibility.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/ma0300544</doi><tpages>8</tpages></addata></record> |
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title | Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide |
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