Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F14%3A00435585" target="_blank" >RIV/61389013:_____/14:00435585 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2014.07.033" target="_blank" >http://dx.doi.org/10.1016/j.eurpolymj.2014.07.033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2014.07.033" target="_blank" >10.1016/j.eurpolymj.2014.07.033</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity

Popis výsledku v původním jazyce

Super-porous nanocomposite hydrogels, based on PNIPAm matrix and reinforced by acid- and base-resistant TiO2 nanoparticles were prepared via freezing polymerization. The hydrogels display a fast swelling response to temperature (potential application asmechanical actuators), which is enabled by the nano-reinforcement. The reinforcing effect of TiO2 was strongly enhanced (by nearly one order) through the incorporation of small amounts (2.5 mol%) of sodium methacrylate (SMA) as comonomer, which stronglyadsorbs on the TiO2 particles? surface, in analogy to ionic double layer adsorption of salts on free TiO2 colloid particles. The SMA adsorption is so strong, that the pH-responsivity of the swelling of the PNIPAm-SMA copolymer is practically suppressed.A significant pH-responsivity was found only in such poly(NIPAm-co-SMA)/TiO2 gels, which contained high amounts of chemical crosslinker. In these rather rigid gels, some of the SMA units were topologically prevented from adsorption to TiO

Název v anglickém jazyce

Super-porous nanocomposite PNIPAm hydrogels reinforced with titania nanoparticles, displaying a very fast temperature response as well as pH-sensitivity

Popis výsledku anglicky

Super-porous nanocomposite hydrogels, based on PNIPAm matrix and reinforced by acid- and base-resistant TiO2 nanoparticles were prepared via freezing polymerization. The hydrogels display a fast swelling response to temperature (potential application asmechanical actuators), which is enabled by the nano-reinforcement. The reinforcing effect of TiO2 was strongly enhanced (by nearly one order) through the incorporation of small amounts (2.5 mol%) of sodium methacrylate (SMA) as comonomer, which stronglyadsorbs on the TiO2 particles? surface, in analogy to ionic double layer adsorption of salts on free TiO2 colloid particles. The SMA adsorption is so strong, that the pH-responsivity of the swelling of the PNIPAm-SMA copolymer is practically suppressed.A significant pH-responsivity was found only in such poly(NIPAm-co-SMA)/TiO2 gels, which contained high amounts of chemical crosslinker. In these rather rigid gels, some of the SMA units were topologically prevented from adsorption to TiO

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GAP107%2F12%2F2445" target="_blank" >GAP107/12/2445: SiOC keramická pěna z pyrolyzovaného polymerního prekurzoru jako jádro tepelně odolných sendvičových struktur</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Polymer Journal

ISSN

0014-3057

e-ISSN

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Svazek periodika

59

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

341-352

Kód UT WoS článku

000343341100037

EID výsledku v databázi Scopus

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