Functional properties of films based on novel waterborne polyurethane dispersions prepared without a chain-extension step
The result's identifiers
Result code in 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>
Alternative codes found
RIV/00216208:11310/18:10386216
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Functional properties of films based on novel waterborne polyurethane dispersions prepared without a chain-extension step
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
<a href="/en/project/GA18-03932S" target="_blank" >GA18-03932S: Polyurethanes with integrated inorganic/organic blocks and controllable hydrolytic stability</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Progress in Organic Coatings
ISSN
0300-9440
e-ISSN
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Volume of the periodical
123
Issue of the periodical within the volume
October
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
53-62
UT code for WoS article
000444357000007
EID of the result in the Scopus database
2-s2.0-85049064588