Temperature-dependent interfacial properties of hydrophobically end-modified poly(2-isopropyl-2-oxazoline)s assemblies at the air/water interface and on solid substrates

Rodolphe Obeid, Jin Young Park, Rigoberto C. Advincula, Françoise M. Winnik

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We describe herein the properties at the air/water (A/W) interface of hydrophobically end-modified (HM) poly(2-isopropyl-2-oxazoline)s (PiPrOx) bearing an n-octadecyl chain on both termini (telechelic HM-PiPrOx) or on one chain end (semitelechelic HM-PiPrOx) for different subphase temperatures and spreading solvents using the Langmuir film balance technique. The polymer interfacial properties revealed by the π-A isotherms depend markedly on the architecture and molecular weight of the polymer. On cold water subphases (14 °C), diffusion of PiPrOx chains onto water takes place for all polymers in the intermediate compressibility region (5 mN m-1). At higher subphase temperatures (36 and 48 °C), the HM-PiPrOx film exhibited remarkable stability with time. Brewster angle microscopy (BAM) imaging of the A/W interface showed that the polymer assembly was not uniform and that large domains formed, either isolated grains or pearl necklaces, depending on the polymer structure, the concentration of the spreading solution and the subphase temperature. The Langmuir films were transferred onto hydrophilic substrates (silica) by the Langmuir-Blodgett (LB) technique and onto hydrophobic substrates (gold) by Langmuir-Schaefer (LS) film deposition, resulting in the formation of adsorbed particles ranging in size from 200 to 500 nm, depending on the polymer architecture and the substrate temperature. The particles presented "Janus"-like hydrophilic/hydrophobic characteristics.

Original languageEnglish
Pages (from-to)142-152
Number of pages11
JournalJournal of Colloid and Interface Science
Volume340
Issue number2
DOIs
Publication statusPublished - 2009 Dec 15
Externally publishedYes

Fingerprint

Polymers
Water
Langmuir Blodgett films
Substrates
Air
Temperature
Bearings (structural)
Compressibility
Silicon Dioxide
Gold
Isotherms
Microscopic examination
Molecular weight
Silica
Imaging techniques

Keywords

  • Air/water interface
  • Atomic force microscopy
  • Brewster angle microscopy (BAM)
  • Domains
  • Hydrophobicaly-modified polymers
  • Langmuir films
  • Langmuir-Blodgett (LB)
  • Langmuir-Schaefer (LS)
  • Lower critical solution temperature (LCST)
  • Poly(2-isopropyl-2-oxazoline)
  • Self-assembly
  • Telechelic polymers
  • Thermo-responsive polymers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Temperature-dependent interfacial properties of hydrophobically end-modified poly(2-isopropyl-2-oxazoline)s assemblies at the air/water interface and on solid substrates. / Obeid, Rodolphe; Park, Jin Young; Advincula, Rigoberto C.; Winnik, Françoise M.

In: Journal of Colloid and Interface Science, Vol. 340, No. 2, 15.12.2009, p. 142-152.

Research output: Contribution to journalArticle

@article{288613d57d314ab1be7593f191fab28e,
title = "Temperature-dependent interfacial properties of hydrophobically end-modified poly(2-isopropyl-2-oxazoline)s assemblies at the air/water interface and on solid substrates",
abstract = "We describe herein the properties at the air/water (A/W) interface of hydrophobically end-modified (HM) poly(2-isopropyl-2-oxazoline)s (PiPrOx) bearing an n-octadecyl chain on both termini (telechelic HM-PiPrOx) or on one chain end (semitelechelic HM-PiPrOx) for different subphase temperatures and spreading solvents using the Langmuir film balance technique. The polymer interfacial properties revealed by the π-A isotherms depend markedly on the architecture and molecular weight of the polymer. On cold water subphases (14 °C), diffusion of PiPrOx chains onto water takes place for all polymers in the intermediate compressibility region (5 mN m-1). At higher subphase temperatures (36 and 48 °C), the HM-PiPrOx film exhibited remarkable stability with time. Brewster angle microscopy (BAM) imaging of the A/W interface showed that the polymer assembly was not uniform and that large domains formed, either isolated grains or pearl necklaces, depending on the polymer structure, the concentration of the spreading solution and the subphase temperature. The Langmuir films were transferred onto hydrophilic substrates (silica) by the Langmuir-Blodgett (LB) technique and onto hydrophobic substrates (gold) by Langmuir-Schaefer (LS) film deposition, resulting in the formation of adsorbed particles ranging in size from 200 to 500 nm, depending on the polymer architecture and the substrate temperature. The particles presented {"}Janus{"}-like hydrophilic/hydrophobic characteristics.",
keywords = "Air/water interface, Atomic force microscopy, Brewster angle microscopy (BAM), Domains, Hydrophobicaly-modified polymers, Langmuir films, Langmuir-Blodgett (LB), Langmuir-Schaefer (LS), Lower critical solution temperature (LCST), Poly(2-isopropyl-2-oxazoline), Self-assembly, Telechelic polymers, Thermo-responsive polymers",
author = "Rodolphe Obeid and Park, {Jin Young} and Advincula, {Rigoberto C.} and Winnik, {Fran{\cc}oise M.}",
year = "2009",
month = "12",
day = "15",
doi = "10.1016/j.jcis.2009.06.060",
language = "English",
volume = "340",
pages = "142--152",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Temperature-dependent interfacial properties of hydrophobically end-modified poly(2-isopropyl-2-oxazoline)s assemblies at the air/water interface and on solid substrates

AU - Obeid, Rodolphe

AU - Park, Jin Young

AU - Advincula, Rigoberto C.

AU - Winnik, Françoise M.

PY - 2009/12/15

Y1 - 2009/12/15

N2 - We describe herein the properties at the air/water (A/W) interface of hydrophobically end-modified (HM) poly(2-isopropyl-2-oxazoline)s (PiPrOx) bearing an n-octadecyl chain on both termini (telechelic HM-PiPrOx) or on one chain end (semitelechelic HM-PiPrOx) for different subphase temperatures and spreading solvents using the Langmuir film balance technique. The polymer interfacial properties revealed by the π-A isotherms depend markedly on the architecture and molecular weight of the polymer. On cold water subphases (14 °C), diffusion of PiPrOx chains onto water takes place for all polymers in the intermediate compressibility region (5 mN m-1). At higher subphase temperatures (36 and 48 °C), the HM-PiPrOx film exhibited remarkable stability with time. Brewster angle microscopy (BAM) imaging of the A/W interface showed that the polymer assembly was not uniform and that large domains formed, either isolated grains or pearl necklaces, depending on the polymer structure, the concentration of the spreading solution and the subphase temperature. The Langmuir films were transferred onto hydrophilic substrates (silica) by the Langmuir-Blodgett (LB) technique and onto hydrophobic substrates (gold) by Langmuir-Schaefer (LS) film deposition, resulting in the formation of adsorbed particles ranging in size from 200 to 500 nm, depending on the polymer architecture and the substrate temperature. The particles presented "Janus"-like hydrophilic/hydrophobic characteristics.

AB - We describe herein the properties at the air/water (A/W) interface of hydrophobically end-modified (HM) poly(2-isopropyl-2-oxazoline)s (PiPrOx) bearing an n-octadecyl chain on both termini (telechelic HM-PiPrOx) or on one chain end (semitelechelic HM-PiPrOx) for different subphase temperatures and spreading solvents using the Langmuir film balance technique. The polymer interfacial properties revealed by the π-A isotherms depend markedly on the architecture and molecular weight of the polymer. On cold water subphases (14 °C), diffusion of PiPrOx chains onto water takes place for all polymers in the intermediate compressibility region (5 mN m-1). At higher subphase temperatures (36 and 48 °C), the HM-PiPrOx film exhibited remarkable stability with time. Brewster angle microscopy (BAM) imaging of the A/W interface showed that the polymer assembly was not uniform and that large domains formed, either isolated grains or pearl necklaces, depending on the polymer structure, the concentration of the spreading solution and the subphase temperature. The Langmuir films were transferred onto hydrophilic substrates (silica) by the Langmuir-Blodgett (LB) technique and onto hydrophobic substrates (gold) by Langmuir-Schaefer (LS) film deposition, resulting in the formation of adsorbed particles ranging in size from 200 to 500 nm, depending on the polymer architecture and the substrate temperature. The particles presented "Janus"-like hydrophilic/hydrophobic characteristics.

KW - Air/water interface

KW - Atomic force microscopy

KW - Brewster angle microscopy (BAM)

KW - Domains

KW - Hydrophobicaly-modified polymers

KW - Langmuir films

KW - Langmuir-Blodgett (LB)

KW - Langmuir-Schaefer (LS)

KW - Lower critical solution temperature (LCST)

KW - Poly(2-isopropyl-2-oxazoline)

KW - Self-assembly

KW - Telechelic polymers

KW - Thermo-responsive polymers

UR - http://www.scopus.com/inward/record.url?scp=70349807757&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70349807757&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2009.06.060

DO - 10.1016/j.jcis.2009.06.060

M3 - Article

C2 - 19796770

AN - SCOPUS:70349807757

VL - 340

SP - 142

EP - 152

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -