Dynamics of a Thermoreversible Transition between Cylindrical and Hexagonally Perforated Lamellar Mesophases
A polystyrene−poly(ethylene-alt-propylene) diblock copolymer, S/EP 7/13, exhibits a thermoreversible mesophase transition between low-temperature hexagonally perforated lamellae (HPL) and high-temperature hexagonally packed cylinders (C). The transformation process is accompanied by a 6% change in t...
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| Veröffentlicht in: | Macromolecules 2005-08, Vol.38 (16), p.7098-7104 |
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| container_title | Macromolecules |
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| creator | Lai, Chiajen Loo, Yueh-Lin Register, Richard A Adamson, Douglas H |
| description | A polystyrene−poly(ethylene-alt-propylene) diblock copolymer, S/EP 7/13, exhibits a thermoreversible mesophase transition between low-temperature hexagonally perforated lamellae (HPL) and high-temperature hexagonally packed cylinders (C). The transformation process is accompanied by a 6% change in the principal spacing, yet oriented specimens retain their macroscopic orientation through the transition. The C → HPL transformation proceeds on a time scale of tens of minutes, at a rate which initially increases rapidly with undercooling relative to the order−order transition temperature. At deep undercoolings, the transformation rate slows due to a reduction in molecular mobility. By contrast, the HPL → C transformation occurs nearly 2 orders of magnitude more rapidly, a difference which is suggested to reflect the nature of the dominant fluctuation modes for the two structures. |
| doi_str_mv | 10.1021/ma050953n |
| format | Article |
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The transformation process is accompanied by a 6% change in the principal spacing, yet oriented specimens retain their macroscopic orientation through the transition. The C → HPL transformation proceeds on a time scale of tens of minutes, at a rate which initially increases rapidly with undercooling relative to the order−order transition temperature. At deep undercoolings, the transformation rate slows due to a reduction in molecular mobility. 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The transformation process is accompanied by a 6% change in the principal spacing, yet oriented specimens retain their macroscopic orientation through the transition. The C → HPL transformation proceeds on a time scale of tens of minutes, at a rate which initially increases rapidly with undercooling relative to the order−order transition temperature. At deep undercoolings, the transformation rate slows due to a reduction in molecular mobility. By contrast, the HPL → C transformation occurs nearly 2 orders of magnitude more rapidly, a difference which is suggested to reflect the nature of the dominant fluctuation modes for the two structures.</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>2005</creationdate><recordtype>article</recordtype><recordid>eNptkDtPwzAUhS0EEuUx8A-8MDAE_IibeETlUaQiGLJHN8k1deXYlR0e-fcEFdGF6SzfOdJ3CLng7JozwW96YIppJf0BmXElWKZKqQ7JjDGRZ1ro4picpLRhjHOVyxlxd6OH3raJBkOBVmuMfYj4gTHZxiGtIvhkBxs8bXD4RPR0MTrru2hbcBR8R5f4BW_Bg3MjfcVoQoQBO7qCHp2DSJ8xhe0aEqYzcmTAJTz_zVNSPdxXi2W2enl8WtyuMpBKDZmeY9sYrdAoLoXmc12ykmmBfC5y0YJiUpasMMXkJkRegim6UkKDykjEVp6Sq91sG0NKEU29jbaHONac1T8v1X8vTezljt1CmoTMpNvatC8UjMkyz_cctKnehPc4-aZ_9r4BLoN0iQ</recordid><startdate>20050809</startdate><enddate>20050809</enddate><creator>Lai, Chiajen</creator><creator>Loo, Yueh-Lin</creator><creator>Register, Richard A</creator><creator>Adamson, Douglas H</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20050809</creationdate><title>Dynamics of a Thermoreversible Transition between Cylindrical and Hexagonally Perforated Lamellar Mesophases</title><author>Lai, Chiajen ; Loo, Yueh-Lin ; Register, Richard A ; Adamson, Douglas H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a355t-96ecbf95ef51329169808092e16242ca5033807f75832248af7d83abe5f3eec3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</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>Lai, Chiajen</creatorcontrib><creatorcontrib>Loo, Yueh-Lin</creatorcontrib><creatorcontrib>Register, Richard A</creatorcontrib><creatorcontrib>Adamson, Douglas H</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Macromolecules</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lai, Chiajen</au><au>Loo, Yueh-Lin</au><au>Register, Richard A</au><au>Adamson, Douglas H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dynamics of a Thermoreversible Transition between Cylindrical and Hexagonally Perforated Lamellar Mesophases</atitle><jtitle>Macromolecules</jtitle><addtitle>Macromolecules</addtitle><date>2005-08-09</date><risdate>2005</risdate><volume>38</volume><issue>16</issue><spage>7098</spage><epage>7104</epage><pages>7098-7104</pages><issn>0024-9297</issn><eissn>1520-5835</eissn><coden>MAMOBX</coden><abstract>A polystyrene−poly(ethylene-alt-propylene) diblock copolymer, S/EP 7/13, exhibits a thermoreversible mesophase transition between low-temperature hexagonally perforated lamellae (HPL) and high-temperature hexagonally packed cylinders (C). The transformation process is accompanied by a 6% change in the principal spacing, yet oriented specimens retain their macroscopic orientation through the transition. The C → HPL transformation proceeds on a time scale of tens of minutes, at a rate which initially increases rapidly with undercooling relative to the order−order transition temperature. At deep undercoolings, the transformation rate slows due to a reduction in molecular mobility. By contrast, the HPL → C transformation occurs nearly 2 orders of magnitude more rapidly, a difference which is suggested to reflect the nature of the dominant fluctuation modes for the two structures.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/ma050953n</doi><tpages>7</tpages></addata></record> |
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| source | ACS Publications |
| subjects | Applied sciences Exact sciences and technology Organic polymers Physicochemistry of polymers Properties and characterization Thermal and thermodynamic properties |
| title | Dynamics of a Thermoreversible Transition between Cylindrical and Hexagonally Perforated Lamellar Mesophases |
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