Mechanically strong waterborne poly(urethane‐urea) films and nanocomposite films

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F21%3A00535895" target="_blank" >RIV/61389013:_____/21:00535895 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/app.50011" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/app.50011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/app.50011" target="_blank" >10.1002/app.50011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mechanically strong waterborne poly(urethane‐urea) films and nanocomposite films

Popis výsledku v původním jazyce

A series of transparent waterborne poly(urethane‐urea) (PUU) films and nanocomposite films were prepared using isocyanate excess (5–50 mol% excess relative to the hydroxyl groups) and omitting the common chain‐extension step in the acetone method of the preparation. The surplus isocyanate groups were converted into urea and eventually biuret linkages via the reaction with water during the last phase inversion step. Nanocomposites were prepared by the direct mixing of the PUU nanoparticles in water with aqueous nanosilica or montmorillonite powder followed by slow water evaporation. Variable urea/biuret content is responsible for substantially different tensile properties. The neat organic films show elongation‐at‐break values of 100%–1120%, tensile strength values of 0.07–22.1 MPa, and energy‐to‐break of 0.1–85 mJ × mm−3. All of the materials can be potentially used as soft‐to‐hard topcoats, depending on the specific demands. The most promising materials are films prepared at 30 and particularly 40 mol% isocyanate excess.

Název v anglickém jazyce

Mechanically strong waterborne poly(urethane‐urea) films and nanocomposite films

Popis výsledku anglicky

A series of transparent waterborne poly(urethane‐urea) (PUU) films and nanocomposite films were prepared using isocyanate excess (5–50 mol% excess relative to the hydroxyl groups) and omitting the common chain‐extension step in the acetone method of the preparation. The surplus isocyanate groups were converted into urea and eventually biuret linkages via the reaction with water during the last phase inversion step. Nanocomposites were prepared by the direct mixing of the PUU nanoparticles in water with aqueous nanosilica or montmorillonite powder followed by slow water evaporation. Variable urea/biuret content is responsible for substantially different tensile properties. The neat organic films show elongation‐at‐break values of 100%–1120%, tensile strength values of 0.07–22.1 MPa, and energy‐to‐break of 0.1–85 mJ × mm−3. All of the materials can be potentially used as soft‐to‐hard topcoats, depending on the specific demands. The most promising materials are films prepared at 30 and particularly 40 mol% isocyanate excess.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA18-03932S" target="_blank" >GA18-03932S: Polyuretany s řízeně zabudovanými anorganickými/organickými bloky a regulovatelnou hydrolytickou stabilitou</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Applied Polymer Science

ISSN

0021-8995

e-ISSN

1097-4628

Svazek periodika

138

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

e50011

Kód UT WoS článku

000575124000001

EID výsledku v databázi Scopus

2-s2.0-85092076645