Improving the Colloidal Stability of Temperature-Sensitive Poly(N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61389013:_____/18:00494383

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Improving the Colloidal Stability of Temperature-Sensitive Poly(N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives

Popis výsledku v původním jazyce

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&apos;t Hoff equation. Phase separation temperatures Tp and thermodynamic parameters (enthalpy and entropy change) connected with the phase separation of were &apos;obtainedusing this method.was determined that TP is dependent on additives in the following order: TP (t-BuANI) &gt; Tp(t-BUOH) &gt; Tp(t-BUME) &gt; Tp(t-BuMIK). Also, either increasing the additive concentration or increasing plc of the additive leads to depression of Tr Time-resolved &apos;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.

Název v anglickém jazyce

Improving the Colloidal Stability of Temperature-Sensitive Poly(N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives

Popis výsledku anglicky

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&apos;t Hoff equation. Phase separation temperatures Tp and thermodynamic parameters (enthalpy and entropy change) connected with the phase separation of were &apos;obtainedusing this method.was determined that TP is dependent on additives in the following order: TP (t-BuANI) &gt; Tp(t-BUOH) &gt; Tp(t-BUME) &gt; Tp(t-BuMIK). Also, either increasing the additive concentration or increasing plc of the additive leads to depression of Tr Time-resolved &apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

ACS Omega [online]

ISSN

2470-1343

e-ISSN

—

Svazek periodika

3

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

11865-11873

Kód UT WoS článku

000446186000153

EID výsledku v databázi Scopus

2-s2.0-85053866947