Tremendous reinforcing, pore-stabilizing and response-accelerating effect of in situ generated nanosilica in thermoresponsive poly(N-isopropylacrylamide) cryogels

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00478890" target="_blank" >RIV/61389013:_____/17:00478890 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1002/pi.5406" target="_blank" >http://dx.doi.org/10.1002/pi.5406</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/pi.5406" target="_blank" >10.1002/pi.5406</a>

Result language

angličtina

Original language name

Tremendous reinforcing, pore-stabilizing and response-accelerating effect of in situ generated nanosilica in thermoresponsive poly(N-isopropylacrylamide) cryogels

Original language description

The tremendous reinforcing and pore-stabilizing effect of in situ formed nanosilica in a highly porous temperature-responsive poly(N-isopropylacrylamide) (PNIPA) matrix is demonstrated. A very weakly crosslinked semi-liquid hydrogel can be reinforced to the point that it displays a fast, extensive and nearly symmetric temperature-responsiveness in combination with an acceptable modulus. In soft but solid porous PNIPA, only 0.6 wt% of the nanofiller is sufficient to stabilize the pores against collapse upon de-swelling, thus enabling ultrafast responsiveness. A spectacular effect is achieved with dried porous PNIPA (matrix is glassy, Tg approximate to 140 °C), which in the case of optimal nanosilica amounts can re-swell in only 3 min. The key importance of efficient hydrogen bridging between PNIPA and SiO2 is demonstrated by comparing in situ formed nanosilica with similarly sized commercial Ludox particles, the surface of which is saturated with ammonia (for stabilization). Synthesis parameters like the amount of crosslinker and of nanosilica were varied in a wide range, in order to achieve the fastest possible responsiveness of the hydrogels in combination with a high modulus. The porosity, nanosilica distribution, moduli, temperature-dependent swelling as well as the swelling kinetics of the gels were determined as functions of contents of crosslinker and nanosilica.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10404 - Polymer science

Project

<a href="/en/project/GA17-13103S" target="_blank" >GA17-13103S: Advanced smart and self-healing polymer nanocomposites</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

Polymer International

ISSN

0959-8103

e-ISSN

—

Volume of the periodical

66

Issue of the periodical within the volume

11

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

1510-1521

UT code for WoS article

000412166000012

EID of the result in the Scopus database

2-s2.0-85021407215