Phase transition in hydrogels of thermoresponsive interpenetrating polymer networks
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F16%3A00456047" target="_blank" >RIV/61389013:_____/16:00456047 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/00216208:11320/16:10332011
Výsledek na webu
<a href="http://dx.doi.org/10.1002/masy.201400244" target="_blank" >http://dx.doi.org/10.1002/masy.201400244</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/masy.201400244" target="_blank" >10.1002/masy.201400244</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Phase transition in hydrogels of thermoresponsive interpenetrating polymer networks
Popis výsledku v původním jazyce
We compared behavior of hydrogels of two types of thermoresponsive interpenetrating polymer networks (IPN), PNIPMAm/PNIPAm and PVCL/PNIPAm, during their phase transition. One or two transitions, depending on the ratio of both IPN components, were found by NMR and DSC. SANS results showed that compact multi-chain globules with gyration radius silimar to 20 nm are formed in collapsed IPN hydrogels. A certain portion of spatially restricted bound water (HDO) was established for all studied IPNs in the phase transition region and at temperatures above the phase transition by NMR methods. Fraction of bound water slowly decreases with time. The separate signal of bound water in NMR spectra appears already in pretransition region at temperatures when polymer segments just begin to form collapsed structures. Higher content of bound water as found for collapsed PVCL/PNIPAm hydrogels in comparison with PNIPMAm/PNIPAm hydrogels is in accord with swelling experiments and lower values of the shear mechanical modulus, and shows the decisive role of bound water in this respect.n
Název v anglickém jazyce
Phase transition in hydrogels of thermoresponsive interpenetrating polymer networks
Popis výsledku anglicky
We compared behavior of hydrogels of two types of thermoresponsive interpenetrating polymer networks (IPN), PNIPMAm/PNIPAm and PVCL/PNIPAm, during their phase transition. One or two transitions, depending on the ratio of both IPN components, were found by NMR and DSC. SANS results showed that compact multi-chain globules with gyration radius silimar to 20 nm are formed in collapsed IPN hydrogels. A certain portion of spatially restricted bound water (HDO) was established for all studied IPNs in the phase transition region and at temperatures above the phase transition by NMR methods. Fraction of bound water slowly decreases with time. The separate signal of bound water in NMR spectra appears already in pretransition region at temperatures when polymer segments just begin to form collapsed structures. Higher content of bound water as found for collapsed PVCL/PNIPAm hydrogels in comparison with PNIPMAm/PNIPAm hydrogels is in accord with swelling experiments and lower values of the shear mechanical modulus, and shows the decisive role of bound water in this respect.n
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
CD - Makromolekulární chemie
OECD FORD obor
—
Návaznosti výsledku
Projekt
<a href="/cs/project/GA13-23392S" target="_blank" >GA13-23392S: Vývoj a charakterizace nových teplotně citlivých polymerních hydrogelů</a><br>
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2016
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
Macromolecular Symposia. Volume 359, Issue 1
ISBN
—
ISSN
1022-1360
e-ISSN
—
Počet stran výsledku
7
Strana od-do
111-117
Název nakladatele
WILEY-VCH Verlag
Místo vydání
Weinheim
Místo konání akce
Salerno
Datum konání akce
22. 9. 2014
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
000377290000013