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Functional Thermoresponsive Polymers based on 2,6-Diaminopyridine with Tunable UCST Behavior

  • Thermoresponsive polymers are of great importance in numerous applications such as bioseparation, drug delivery, diagnostic and microfluidic applications. Only few thermoresponsive polymers that present an upper critical solution temperature (UCST), i.e. phase separate from solution upon cooling, in a relevant temperature range and green solvents such as water or ethanol have been reported. In this work two novel functional polymers of based on a 2,6-diaminopyridine motif, namely poly(N-(6-aminopyridin-2-yl)acrylamide) (PNAPAAm) and poly(N-(6-acetamidopyridin-2-yl)acrylamide) (PNAcAPAAm), were synthesized by free radical polymerization. The obtained polymers displayed UCST-type reversible thermoresponsive behaviour in water/alcohol mixtures. Insights into this phenomenon will be given based on visual observations, temperature-dependent turbidimetry and dynamic light scattering as well as 1H-NMR measurements. The UCST phase transition behaviour of the polymers was tunable by varyingThermoresponsive polymers are of great importance in numerous applications such as bioseparation, drug delivery, diagnostic and microfluidic applications. Only few thermoresponsive polymers that present an upper critical solution temperature (UCST), i.e. phase separate from solution upon cooling, in a relevant temperature range and green solvents such as water or ethanol have been reported. In this work two novel functional polymers of based on a 2,6-diaminopyridine motif, namely poly(N-(6-aminopyridin-2-yl)acrylamide) (PNAPAAm) and poly(N-(6-acetamidopyridin-2-yl)acrylamide) (PNAcAPAAm), were synthesized by free radical polymerization. The obtained polymers displayed UCST-type reversible thermoresponsive behaviour in water/alcohol mixtures. Insights into this phenomenon will be given based on visual observations, temperature-dependent turbidimetry and dynamic light scattering as well as 1H-NMR measurements. The UCST phase transition behaviour of the polymers was tunable by varying either the concentration of the polymer solution, the nature of the alcohol or the composition of the solvent mixture. The cloud point temperature of PNAcAPAAm was found to decrease with increasing alcohol content (MeOH, EtOH and iPrOH) in water/alcohol mixtures. Past a critical amount of EtOH or iPrOH in water the cloud point temperature of PNAcAPAAm increased by further addition of EtOH or iPrOH. These polymers with UCST behavior below 60°C in water/alcohol mixtures show great promises for the preparation of smart materials for sensing.zeige mehrzeige weniger

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Metadaten
Autor*innen:Annabelle BertinORCiD
Koautor*innen:Asad Asadujjaman, Vahid Ahmadi, M. Yalcin, N. ten Brummelhuis
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:2,6-diaminopyridine; Cosolvency; UCST polymer
Veranstaltung:European Polymer Congress Lyon 2017
Veranstaltungsort:Lyon, France
Beginndatum der Veranstaltung:02.07.2017
Enddatum der Veranstaltung:07.07.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:12.07.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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