Functional properties of films based on novel waterborne polyurethane dispersions prepared without a chain-extension step

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F18%3A00490768" target="_blank" >RIV/61389013:_____/18:00490768 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/18:10386216

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.porgcoat.2018.06.014" target="_blank" >http://dx.doi.org/10.1016/j.porgcoat.2018.06.014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.porgcoat.2018.06.014" target="_blank" >10.1016/j.porgcoat.2018.06.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Functional properties of films based on novel waterborne polyurethane dispersions prepared without a chain-extension step

Popis výsledku v původním jazyce

A series of novel waterborne polyurethane (PU) dispersions was prepared from a polycarbonate-based macrodiol, 1,6-diisocyanatohexane, 2,2-bis(hydroxymethyl) propionic acid (DMPA) and triethylamine. Different macrodiol-to-DMPA (diol) ratios and different excesses of isocyanate were used, and the typically used chain-extension step was omitted. Systematic measurements of the particle size revealed that PU particles have diameters lower than 100 nm at diol ratios of 1:1 and 1:2, while a diol ratio of 2:1 leads to nanoparticles with diameters closer to 100 nm or higher. The lowest size-dispersity (DLS) index was found for PU dispersions with a diol ratio of 1:1 for all excesses of NCO. The high negative values of ζ-potential (from −40 to −65 mV) of these materials indicate their long-term stability. The tensile properties of flat films made from the PU dispersions depend significantly on the sample composition and vary from 2.7 to 33.8 MPa (Young’s modulus), 0.2 to 28.0 MPa (tensile strength), 112 to 1193% (elongation-at-break) and 0.5 to 93.2 mJ mm−3 (toughness). The films were found to be thermally stable to a minimum of 200 °C. Dispersions prepared with a 30 and 50 mol% excess of NCO and diol ratios of 1:1 and 1:2 are the most promising materials for practical use as coatings or films. These materials can be used alone or together with water-dispersible additives as the matrix for diverse nanocomposite 2D systems.

Název v anglickém jazyce

Functional properties of films based on novel waterborne polyurethane dispersions prepared without a chain-extension step

Popis výsledku anglicky

A series of novel waterborne polyurethane (PU) dispersions was prepared from a polycarbonate-based macrodiol, 1,6-diisocyanatohexane, 2,2-bis(hydroxymethyl) propionic acid (DMPA) and triethylamine. Different macrodiol-to-DMPA (diol) ratios and different excesses of isocyanate were used, and the typically used chain-extension step was omitted. Systematic measurements of the particle size revealed that PU particles have diameters lower than 100 nm at diol ratios of 1:1 and 1:2, while a diol ratio of 2:1 leads to nanoparticles with diameters closer to 100 nm or higher. The lowest size-dispersity (DLS) index was found for PU dispersions with a diol ratio of 1:1 for all excesses of NCO. The high negative values of ζ-potential (from −40 to −65 mV) of these materials indicate their long-term stability. The tensile properties of flat films made from the PU dispersions depend significantly on the sample composition and vary from 2.7 to 33.8 MPa (Young’s modulus), 0.2 to 28.0 MPa (tensile strength), 112 to 1193% (elongation-at-break) and 0.5 to 93.2 mJ mm−3 (toughness). The films were found to be thermally stable to a minimum of 200 °C. Dispersions prepared with a 30 and 50 mol% excess of NCO and diol ratios of 1:1 and 1:2 are the most promising materials for practical use as coatings or films. These materials can be used alone or together with water-dispersible additives as the matrix for diverse nanocomposite 2D systems.

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

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Progress in Organic Coatings

ISSN

0300-9440

e-ISSN

—

Svazek periodika

123

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

53-62

Kód UT WoS článku

000444357000007

EID výsledku v databázi Scopus

2-s2.0-85049064588