Formation of linear and crosslinked polyurethane nanoparticles that self-assemble differently in acetone and in water

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00472825" target="_blank" >RIV/61389013:_____/17:00472825 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/17:10368992

Result on the web

<a href="http://dx.doi.org/10.1016/j.porgcoat.2017.03.003" target="_blank" >http://dx.doi.org/10.1016/j.porgcoat.2017.03.003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.porgcoat.2017.03.003" target="_blank" >10.1016/j.porgcoat.2017.03.003</a>

Result language

angličtina

Original language name

Formation of linear and crosslinked polyurethane nanoparticles that self-assemble differently in acetone and in water

Original language description

For the first time, stable water-borne polyurethane dispersions (PUDs) leading to mechanically strong polyurethane (PU) coatings were prepared without any chain extender. Elimination of this step and using of water-crosslinking gives promising applications of PUDs as biomaterials and production on an industrial scale. The PU system consists of polycarbonate macrodiol (PCD), (2,2-bis(hydroxymethyl)) propionic acid (DMPA), 1,6-diisocyanatohexane (HDI) and N,N-diethylethanamine (TEA). Fourier transform infrared spectroscopy (FTIR), dynamic mechanical thermal analysis (DMTA), static light scattering (SLS), dynamic light scattering (DLS) and atomic force microscopy (AFM) enabled the study of the assembly of the PU chains/nanoparticles into supramolecular structures in acetone and in water. In acetone, the self-assembly of isocyanate-terminated pre-polymer chains occurs in the form of either PU solutions (linear PUs) or PU dispersions (crosslinked PUs). Due to a phase inversion, spherical linear or water-crosslinked PU dispersions are formed after water addition. The isocyanate-to-total hydroxyl ratio is very important. A slight isocyanate (NCO) excess of 1.05 leads to linear rod-like nanoparticles in acetone followed by a core-shell structure after water addition. An isocyanate excess of 1.5 leads to compact sphere or microgel particles initially crosslinked by moisture in acetone, and the final crosslinking and phase inversion occurs after water addition. The chain lengths of the linear PUs and the mesh sizes in PU networks increase with the PCD:DMPA ratio. Thus, the design of PU nanoparticles with desired sizes, shapes and crosslink densities is possible. Unlike the substantially different shapes, sizes and compactness of PUs in acetone, all PUDs in water are spherical nanoparticles with an average diameter from 21 to 72 nm, a zeta potential from -40 to -65 mV and a size-dispersity index from 0.05 to 0.22.

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/GA13-06700S" target="_blank" >GA13-06700S: Multifunctional highly elastic polymeric materials with controlled biodegradability</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

Progress in Organic Coatings

ISSN

0300-9440

e-ISSN

—

Volume of the periodical

106

Issue of the periodical within the volume

May

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

119-127

UT code for WoS article

000399521700014

EID of the result in the Scopus database

2-s2.0-85014856823