Schizophrenic graft copolymers and their stimuli-responsive self-assembly behavior

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http://hdl.handle.net/10138/174099
Title: Schizophrenic graft copolymers and their stimuli-responsive self-assembly behavior
Author: Jiang, Tao
Contributor: Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Kemian laitos
Thesis level:
Abstract: Dually thermoresponsive poly(sulfobetaine methacylate)-graft-(poly(poly(ethylene glycol) methyl ether methacrylate)-co-poly(di(ethylene glycol) methyl ether methacrylate) were synthesized via single electron transfer living radical polymerization (SET-LRP). Two different such graft copolymers S70-g-P25D25 and S70-g-P70D280 with different side chain lengths were prepared and studied. These polymers showed "schezophrenic" self-assembly behavior in response to temperature and ionic strength in aqeuous solution in water. S70-g-P25D25 formed nanostructures at temperatures both above the lower critical solution temperature (LCST) and below the upper critical solution temperature (UCST) with inversed core-shell nature in aqueous solution. Under saline condition no nano structure could be observed at temperatures below the UCST. For S70-g-P70D280, LCST type self-assembly was observed with the formation of similar nanostructures, but at temperatures below UCST, instead of intermolecular aggregation, unimolecular self-assembly was obsverved due to the much more crowded side chains.
Description: Vain tiivistelmä. Opinnäytteiden arkistokappaleet ovat luettavissa Helsingin yliopiston kirjastossa. Hae HELKA-tietokannasta (http://www.helsinki.fi/helka/index.htm).Abstract only. The paper copy of the whole thesis is available for reading room use at the Helsinki University Library. Search HELKA online catalog (http://www.helsinki.fi/helka/index.htm).Endast avhandlingens sammandrag. Pappersexemplaret av hela avhandlingen finns för läsesalsbruk i Helsingfors universitets bibliotek. Sök i HELKA-databasen (http://www.helsinki.fi/helka/index.htm).
URI: http://hdl.handle.net/10138/174099
Date: 2017-01-26
Discipline: Polymeerikemia


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