About: Temperature-induced phase transition in hydrogels of interpenetrating networks poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide)     Goto   Sponge   NotDistinct   Permalink

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Description
  • The combination of H-1 NMR spectroscopy, DSC, dynamic mechanical spectroscopy, and optical microscopy was used to investigate temperature-induced volume phase transition in hydrogels of interpenetrating networks (IPNs) poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide) (PNIPMAm/PNIPAm) with various PNIPMAm content. In these IPNs, both networks are thermosensitive; such systems were not examined so far. All methods showed phase transition starting at 307 K, which is the volume phase transition temperature of PNIPAm, the major network component. Only the sample with the lowest content of PNIPAm (similar to 54 %) shows two-step collapse transition, other samples with higher PNIPAm content show a single transition in NMR and DSC which indicates enhanced mutual entanglement of both components. In all samples, the phase transition results in substantial increase of both components of the shear modulus. Although the properties of all samples change with temperature in similar way, differences in dependence on the PNIPMAm content and the shape of the sample can be seen.
  • The combination of H-1 NMR spectroscopy, DSC, dynamic mechanical spectroscopy, and optical microscopy was used to investigate temperature-induced volume phase transition in hydrogels of interpenetrating networks (IPNs) poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide) (PNIPMAm/PNIPAm) with various PNIPMAm content. In these IPNs, both networks are thermosensitive; such systems were not examined so far. All methods showed phase transition starting at 307 K, which is the volume phase transition temperature of PNIPAm, the major network component. Only the sample with the lowest content of PNIPAm (similar to 54 %) shows two-step collapse transition, other samples with higher PNIPAm content show a single transition in NMR and DSC which indicates enhanced mutual entanglement of both components. In all samples, the phase transition results in substantial increase of both components of the shear modulus. Although the properties of all samples change with temperature in similar way, differences in dependence on the PNIPMAm content and the shape of the sample can be seen. (en)
Title
  • Temperature-induced phase transition in hydrogels of interpenetrating networks poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide)
  • Temperature-induced phase transition in hydrogels of interpenetrating networks poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide) (en)
skos:prefLabel
  • Temperature-induced phase transition in hydrogels of interpenetrating networks poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide)
  • Temperature-induced phase transition in hydrogels of interpenetrating networks poly(N-isopropylmethacrylamide)/poly(N-isopropylacrylamide) (en)
skos:notation
  • RIV/00216208:11320/13:10189385!RIV14-GA0-11320___
http://linked.open...avai/predkladatel
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  • I, P(GA202/09/1281)
http://linked.open...iv/cisloPeriodika
  • 10
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  • 110277
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  • RIV/00216208:11320/13:10189385
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  • Optical microscopy; Dynamic mechanical spectroscopy; DSC; 1H NMR spectroscopy; Poly(N-isopropylmethacrylamide) poly(N-isopropylacrylamide) interpenetrating network; Temperature-induced volume phase transition (en)
http://linked.open.../riv/klicoveSlovo
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  • DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV
  • [5866FC7D31E0]
http://linked.open...i/riv/nazevZdroje
  • Colloid and Polymer Science
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http://linked.open...v/svazekPeriodika
  • 291
http://linked.open...iv/tvurceVysledku
  • Valentová, Helena
  • Hanyková, Lenka
  • Šťastná, Julie
  • Spevacek, Jiří
  • Sedlakova, Zdenka
http://linked.open...ain/vavai/riv/wos
  • 000324559200015
issn
  • 0303-402X
number of pages
http://bibframe.org/vocab/doi
  • 10.1007/s00396-013-2992-z
http://localhost/t...ganizacniJednotka
  • 11320
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