Polyurethane nanocomposites containing the chemically active inorganic Sn-POSS cages

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F19%3A00508517" target="_blank" >RIV/61389013:_____/19:00508517 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1381514819307084?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1381514819307084?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.reactfunctpolym.2019.104338" target="_blank" >10.1016/j.reactfunctpolym.2019.104338</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Polyurethane nanocomposites containing the chemically active inorganic Sn-POSS cages

Popis výsledku v původním jazyce

Nanocomposite polyurethane (PUR) elastomers were synthesized, which contained the heavier, tin-based homologues of POSS (“Sn-POSS”). Most remarkable was the tremendous effect of extremely small Sn-POSS concentrations (around 0.05 wt%) on the glass transition (up-shift by 30–60 °C) of the oxidized Sn-POSS/PUR hybrids, which offers the possibility of improving the properties of an important engineering material class (PUR). Important in this context is the hydrogen bonding between the polar segments of Sn-POSS and the carbamate groups of PUR, which was elucidated by NMR. The rigid Sn-POSS cages are of interest due to their specific aggregation behaviour (observed above 5 wt%), and particularly due to their chemical reactivity, which counteracts oxidative degradation of the nanocomposites. This chemical effect of Sn-POSS is strong already at 0.01 wt%. At 0.5 wt%, the properties of the oxidized samples stay close to their initial state before the oxidation. On the other hand, at ‘high’ Sn-POSS loadings (5–25 wt%), oxidative crosslinking of Sn-POSS with matrix becomes excessive and the oxidized samples are brittle, while also specific heat-induced carbamate–Sn-POSS reactions deteriorate the properties of such oxidized nanocomposites.

Název v anglickém jazyce

Polyurethane nanocomposites containing the chemically active inorganic Sn-POSS cages

Popis výsledku anglicky

Nanocomposite polyurethane (PUR) elastomers were synthesized, which contained the heavier, tin-based homologues of POSS (“Sn-POSS”). Most remarkable was the tremendous effect of extremely small Sn-POSS concentrations (around 0.05 wt%) on the glass transition (up-shift by 30–60 °C) of the oxidized Sn-POSS/PUR hybrids, which offers the possibility of improving the properties of an important engineering material class (PUR). Important in this context is the hydrogen bonding between the polar segments of Sn-POSS and the carbamate groups of PUR, which was elucidated by NMR. The rigid Sn-POSS cages are of interest due to their specific aggregation behaviour (observed above 5 wt%), and particularly due to their chemical reactivity, which counteracts oxidative degradation of the nanocomposites. This chemical effect of Sn-POSS is strong already at 0.01 wt%. At 0.5 wt%, the properties of the oxidized samples stay close to their initial state before the oxidation. On the other hand, at ‘high’ Sn-POSS loadings (5–25 wt%), oxidative crosslinking of Sn-POSS with matrix becomes excessive and the oxidized samples are brittle, while also specific heat-induced carbamate–Sn-POSS reactions deteriorate the properties of such oxidized nanocomposites.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Reactive and Functional Polymers

ISSN

1381-5148

e-ISSN

—

Svazek periodika

143

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

1-16

Kód UT WoS článku

000489195400009

EID výsledku v databázi Scopus

2-s2.0-85070715338