Improving the Colloidal Stability of Temperature-Sensitive Poly(N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10385545" target="_blank" >RIV/00216208:11320/18:10385545 - isvavai.cz</a>
Alternative codes found
RIV/61389013:_____/18:00494383
Result on the web
<a href="https://doi.org/10.1021/acsomega.8b01811" target="_blank" >https://doi.org/10.1021/acsomega.8b01811</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsomega.8b01811" target="_blank" >10.1021/acsomega.8b01811</a>
Alternative languages
Result language
angličtina
Original language name
Improving the Colloidal Stability of Temperature-Sensitive Poly(N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives
Original language description
Poly(N-isopropylacrylamide) (PNIPAM) is an important polymer with stimuli-responsive properties, making it suitable for various uses. Phase behavior of the temperature-sensitive PNIPAM polymer in the presence of four low-molecular weight additives tert-butylamine (t-BuAM), tert-butyl alcohol (tBuOH), tert-butyl methyl ether (t-BuME), and tert-butyl methyl ketone (tBuNIK) was studied in water (D20) using high-resolution nuclear magnetic resonance (NMR) spectroscopy and dynamic light scattering. Phase separation was thermodynamically modeled as a two-state process which resulted in a simple curve which can be used for fitting of NMR data and obtaining all important thermodynamic parameters using simple formulas presented in this paper. The model is based on a modified van't Hoff equation. Phase separation temperatures Tp and thermodynamic parameters (enthalpy and entropy change) connected with the phase separation of were 'obtainedusing this method.was determined that TP is dependent on additives in the following order: TP (t-BuANI) > Tp(t-BUOH) > Tp(t-BUME) > Tp(t-BuMIK). Also, either increasing the additive concentration or increasing plc of the additive leads to depression of Tr Time-resolved 'H NMR spin spin relaxation experiments (T2) performed above the phase separation temperature of PNIPAM revealed high colloidal stability of the phase-separated polymer induced by the additives (relative to the neat) PNIPAM/D20 system). Small quantities of selected suitable additives can be used to optimize the properties of PNIPAM preparations including their phase separation temperatures, colloidal stabilities, and morphologies, thus improving the prospects for the application.
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
10403 - Physical chemistry
Result continuities
Project
—
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
ACS Omega [online]
ISSN
2470-1343
e-ISSN
—
Volume of the periodical
3
Issue of the periodical within the volume
9
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
11865-11873
UT code for WoS article
000446186000153
EID of the result in the Scopus database
2-s2.0-85053866947