About: 1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures

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About: 1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	1H NMR spectroscopy was used to investigate the temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) (PIPMAm/PVCL) mixtures to find out if the phase transition of the given component (PIPMAm or PVCL) is affected by the presence of the second component. Our results that PVCL and PIPMAm transitions are in polymer mixtures shifted by 2 K towards higher temperatures in comparison with neat polymers and depend on polymer concentration show that such effect exists. Spin–spin relaxation times of water (HDO) indicate that in solutions with c 1 wt% a portion of water is predominantly bound in PVCL mesoglobules even at temperatures above the LCST transition of PIPMAm component. Water is with time released from these mesoglobules without any induction period so indicating that it is mostly indirectly bound water. We assume that there is a direct connection between character of the bound water and the transition temperatures. 1H NMR spectroscopy was used to investigate the temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) (PIPMAm/PVCL) mixtures to find out if the phase transition of the given component (PIPMAm or PVCL) is affected by the presence of the second component. Our results that PVCL and PIPMAm transitions are in polymer mixtures shifted by 2 K towards higher temperatures in comparison with neat polymers and depend on polymer concentration show that such effect exists. Spin–spin relaxation times of water (HDO) indicate that in solutions with c 1 wt% a portion of water is predominantly bound in PVCL mesoglobules even at temperatures above the LCST transition of PIPMAm component. Water is with time released from these mesoglobules without any induction period so indicating that it is mostly indirectly bound water. We assume that there is a direct connection between character of the bound water and the transition temperatures. (en)
Title	1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures 1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures (en)
skos:prefLabel	1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures 1H NMR study of temperature-induced phase transitions in aqueous solutions of poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixtures (en)
skos:notation	RIV/61389013:_____/13:00388069!RIV13-AV0-61389013
http://linked.open...avai/predkladatel	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/09/1281), Z(AV0Z40500505)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Spěváček, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	119595
http://linked.open...ai/riv/idVysledku	RIV/61389013:_____/13:00388069
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixture; aqueous solution; temperature-induced phase transition (en)
http://linked.open.../riv/klicoveSlovo	aqueous solution poly(N-isopropylmethacrylamide)/poly(N-vinylcaprolactam) mixture temperature-induced phase transition
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[2A1671136FE1]
http://linked.open...i/riv/nazevZdroje	Polymer Bulletin
http://linked.open...in/vavai/riv/obor	CD
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Stimuli-responsive multicomponent polymer systems in aqueous solutions and gels investigated by NMR and other methods
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	70
http://linked.open...iv/tvurceVysledku	Hanyková, L. Spěváček, Jiří Kouřilová, H.
http://linked.open...ain/vavai/riv/wos	000313059800017
http://linked.open...n/vavai/riv/zamer	Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie
issn	0170-0839
number of pages	15 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s00289-012-0831-x

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