Spontaneous and Thermally Induced Self-Organization of A−B−A Stereoblock Polymers of N-Isopropylacrylamide in Aqueous Solutions
Well defined A−B−A stereoblock polymers with atactic poly(N-isopropylacrylamide) as a hydrophilic block (either A or B) and a water-insoluble block consisting of isotactic poly(N-isopropylacrylamide) were dispersed in water to form, depending on the chain composition, spontaneously micelles of diffe...
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| Veröffentlicht in: | Macromolecules 2008-07, Vol.41 (13), p.4881-4886 |
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| container_end_page | 4886 |
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| container_issue | 13 |
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| container_title | Macromolecules |
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| creator | Nuopponen, Markus Kalliomäki, Katriina Aseyev, Vladimir Tenhu, Heikki |
| description | Well defined A−B−A stereoblock polymers with atactic poly(N-isopropylacrylamide) as a hydrophilic block (either A or B) and a water-insoluble block consisting of isotactic poly(N-isopropylacrylamide) were dispersed in water to form, depending on the chain composition, spontaneously micelles of different morphologies. The structures of the A−B−A stereoblock polymers were carefully characterized using light scattering methods, microcalorimetry, and turbidity. The self-organization and thermally induced phase separation of the stereoblock polymers is strongly affected by the block sequence but not notably affected by thermal history of the polymer solutions. Both flower-like and coil-like branched micelles were observed. Thermal behavior of these is different. However, all polymers form colloidally stable aggregates at elevated temperatures. |
| doi_str_mv | 10.1021/ma800083t |
| format | Article |
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The structures of the A−B−A stereoblock polymers were carefully characterized using light scattering methods, microcalorimetry, and turbidity. The self-organization and thermally induced phase separation of the stereoblock polymers is strongly affected by the block sequence but not notably affected by thermal history of the polymer solutions. Both flower-like and coil-like branched micelles were observed. Thermal behavior of these is different. However, all polymers form colloidally stable aggregates at elevated temperatures.</description><identifier>ISSN: 0024-9297</identifier><identifier>EISSN: 1520-5835</identifier><identifier>DOI: 10.1021/ma800083t</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, 2008-07, Vol.41 (13), p.4881-4886</ispartof><rights>Copyright © 2008 American Chemical Society</rights><rights>2008 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a355t-763c5a67dee5e47a49b1abb0ae33086845a312b5def49f51750eee6cc2195063</citedby><cites>FETCH-LOGICAL-a355t-763c5a67dee5e47a49b1abb0ae33086845a312b5def49f51750eee6cc2195063</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/ma800083t$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/ma800083t$$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=20502950$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Nuopponen, Markus</creatorcontrib><creatorcontrib>Kalliomäki, Katriina</creatorcontrib><creatorcontrib>Aseyev, Vladimir</creatorcontrib><creatorcontrib>Tenhu, Heikki</creatorcontrib><title>Spontaneous and Thermally Induced Self-Organization of A−B−A Stereoblock Polymers of N-Isopropylacrylamide in Aqueous Solutions</title><title>Macromolecules</title><addtitle>Macromolecules</addtitle><description>Well defined A−B−A stereoblock polymers with atactic poly(N-isopropylacrylamide) as a hydrophilic block (either A or B) and a water-insoluble block consisting of isotactic poly(N-isopropylacrylamide) were dispersed in water to form, depending on the chain composition, spontaneously micelles of different morphologies. The structures of the A−B−A stereoblock polymers were carefully characterized using light scattering methods, microcalorimetry, and turbidity. The self-organization and thermally induced phase separation of the stereoblock polymers is strongly affected by the block sequence but not notably affected by thermal history of the polymer solutions. Both flower-like and coil-like branched micelles were observed. Thermal behavior of these is different. 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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 | Spontaneous and Thermally Induced Self-Organization of A−B−A Stereoblock Polymers of N-Isopropylacrylamide in Aqueous Solutions |
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