Thermodynamic and kinetic analysis of phase separation of temperature-sensitive poly(vinyl methyl ether) in the presence of hydrophobic tert-butyl alcohol

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00476353" target="_blank" >RIV/61389013:_____/17:00476353 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s00396-017-4100-2" target="_blank" >http://dx.doi.org/10.1007/s00396-017-4100-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00396-017-4100-2" target="_blank" >10.1007/s00396-017-4100-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamic and kinetic analysis of phase separation of temperature-sensitive poly(vinyl methyl ether) in the presence of hydrophobic tert-butyl alcohol

Popis výsledku v původním jazyce

NMR and isothermal titration calorimetry (ITC) techniques were chosen to examine interactions in a poly(vinyl methyl ether) (PVME)/tert-butyl alcohol (t-BuOH)/water ternary system. The effects of PVME and t-BuOH concentrations on phase separation temperature were examined. Molecules of t-BuOH additive hydrophobically associate with PVME and decrease the phase separation temperature. Thermodynamic parameters connected with phase separation were calculated from NMR results using an approach based on the van’t Hoff equation. Presence of t-BuOH increases the number of PVME monomeric units in one cooperative domain (where the units undergo phase separation as whole—‘all-or-none’). NMR time-resolved relaxation measurements show very different dynamics of the solvent releasing process for low and high PVME concentrations above phase separation temperature. ITC data show that the presence of t-BuOH restricts water solvation of PVME globules. Presented results on the PVME/t-BuOH/D2O system show that the PVME solution properties are not constant in time. The analysis of measurements (and resulting properties) should always be done while considering strong time-dependent behaviour of PVME solutions.

Název v anglickém jazyce

Thermodynamic and kinetic analysis of phase separation of temperature-sensitive poly(vinyl methyl ether) in the presence of hydrophobic tert-butyl alcohol

Popis výsledku anglicky

NMR and isothermal titration calorimetry (ITC) techniques were chosen to examine interactions in a poly(vinyl methyl ether) (PVME)/tert-butyl alcohol (t-BuOH)/water ternary system. The effects of PVME and t-BuOH concentrations on phase separation temperature were examined. Molecules of t-BuOH additive hydrophobically associate with PVME and decrease the phase separation temperature. Thermodynamic parameters connected with phase separation were calculated from NMR results using an approach based on the van’t Hoff equation. Presence of t-BuOH increases the number of PVME monomeric units in one cooperative domain (where the units undergo phase separation as whole—‘all-or-none’). NMR time-resolved relaxation measurements show very different dynamics of the solvent releasing process for low and high PVME concentrations above phase separation temperature. ITC data show that the presence of t-BuOH restricts water solvation of PVME globules. Presented results on the PVME/t-BuOH/D2O system show that the PVME solution properties are not constant in time. The analysis of measurements (and resulting properties) should always be done while considering strong time-dependent behaviour of PVME solutions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GC15-10527J" target="_blank" >GC15-10527J: Sférický „kůň ve vakuu“, anebo použitelné micely? Chování a tvar nanočástic – protirakovinných nosičů léčiv ve skutečném prostředí krve.</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Colloid and Polymer Science

ISSN

0303-402X

e-ISSN

—

Svazek periodika

295

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

1419-1428

Kód UT WoS článku

000406174700016

EID výsledku v databázi Scopus

2-s2.0-85018699777