Thermoresponsive double network hydrogels composed of poly(N-isopropylacrylamide) and polyacrylamide
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405289" target="_blank" >RIV/00216208:11320/19:10405289 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=N1RzFyYlnq" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=N1RzFyYlnq</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.eurpolymj.2019.04.032" target="_blank" >10.1016/j.eurpolymj.2019.04.032</a>
Alternative languages
Result language
angličtina
Original language name
Thermoresponsive double network hydrogels composed of poly(N-isopropylacrylamide) and polyacrylamide
Original language description
Temperature response of double network (DN) hydrogels composed of thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) and hydrophilic polyacrylamide (PAAm) was studied by a combination of swelling and mechanical measurements, differential scanning calorimetry (DSC) and H-1 nuclear magnetic resonance (NMR) spectroscopy. A series of DN hydrogels with tightly crosslinked first network of PNIPAAm and loosely crosslinked second network of PAAm was prepared. In the series, crosslinking density of the first PNIPAAm network was varied while crosslinking density of the second PAAm network was kept constant. Presence of the second hydrophilic PAAm component in DN hydrogels strongly affects their behavior. Both, degree of deswelling and specific enthalpy of demixing in DN hydrogels are strongly reduced relative to corresponding single network (SN) hydrogels. Presence of the second network shows a reinforcing effect on DN hydrogels. From NMR results it follows that mobility of a great part of PNIPAAm in DN hydrogels is significantly reduced due to agglomeration of PNIPAAm induced by formation of the second network already at low temperature. A certain portion of water confined in agglomerated structures and a slow exchange regime between "confined" and "free" water were established by NMR methods for all investigated SN and DN hydrogels.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Polymer Journal
ISSN
0014-3057
e-ISSN
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Volume of the periodical
116
Issue of the periodical within the volume
Neuveden
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
415-424
UT code for WoS article
000471736700042
EID of the result in the Scopus database
2-s2.0-85064518446