Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid

Kód výsledku v IS VaVaI

RIV/61389013:_____/12:00379206 - isvavai.cz

Výsledek na webu

http://dx.doi.org/10.1039/C2SM25625H

DOI - Digital Object Identifier

10.1039/C2SM25625H

Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid

Popis výsledku v původním jazyce

A novel type of amphiphilic ionic copolymer comprising a hydrophilic poly(acrylic acid) (PAA) block and an amphiphilic poly(acrylic acid)-grad-poly(styrene) (PAA-grad-PS) copolymer block was synthesized using a one step direct nitroxide-mediated polymerization. The aggregation behaviour of the copolymers in the aqueous medium was studied by small-angle neutron scattering and dynamic light scattering and by transmission electron microscopy in a wide range of pHs and ionic strengths. It has been demonstrated that PAA-b-(PAA-grad-PS) copolymers are soluble in alkaline water at room temperature without special experimental procedures and self-assemble into nano-scale aggregates at low/moderate pH and/or high ionic strength. In contrast to ?frozen aggregates formed by PAA-b-PS copolymers in aqueous media, the micelles of PAA-b-(PAA-grad-PS) amphiphilic copolymers can reversibly change their aggregation number upon a variation in the pH or salinity of the solution.

Název v anglickém jazyce

Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid

Popis výsledku anglicky

A novel type of amphiphilic ionic copolymer comprising a hydrophilic poly(acrylic acid) (PAA) block and an amphiphilic poly(acrylic acid)-grad-poly(styrene) (PAA-grad-PS) copolymer block was synthesized using a one step direct nitroxide-mediated polymerization. The aggregation behaviour of the copolymers in the aqueous medium was studied by small-angle neutron scattering and dynamic light scattering and by transmission electron microscopy in a wide range of pHs and ionic strengths. It has been demonstrated that PAA-b-(PAA-grad-PS) copolymers are soluble in alkaline water at room temperature without special experimental procedures and self-assemble into nano-scale aggregates at low/moderate pH and/or high ionic strength. In contrast to ?frozen aggregates formed by PAA-b-PS copolymers in aqueous media, the micelles of PAA-b-(PAA-grad-PS) amphiphilic copolymers can reversibly change their aggregation number upon a variation in the pH or salinity of the solution.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

GAP208/10/1600: Polymerní částice a nanostrukturované materiály stabilizované povrchově aktivními molekulami

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Soft Matter

ISSN

1744-683X

e-ISSN

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Svazek periodika

8

Číslo periodika v rámci svazku

29

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

7649-7659

Kód UT WoS článku

000305981600017

EID výsledku v databázi Scopus

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