Arborescent polystyrene-graft-poly(2-vinylpyridine) copolymers

Solution polyelectrolyte behavior

Mario Gauthier, Abdul Munam

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Branched polyelectrolyte precursors were obtained on a 100 g scale by coupling 'living' poly(2-vinylpyridine) (P2VP) macroanions with linear polystyrene and arborescent polystyrene substrates of generations G0 or G1, functionalized with acetyl groups. Arborescent copolymers with M n ≈ 5000 or 30000 side-chains and containing 87-98 mol% of P2VP were thus synthesized. These materials are characterized by a very compact structure, a narrow molecular weight distribution (M w/M n = 1.08-1.10), and a roughly geometric increase in branching functionality and molecular weight for successive generations. The copolymers are freely soluble in water and in polar organic solvents such as methanol and N,N-dimethylformamide (DMF) upon protonation by trifluoroacetic acid (TFA), a strong acid. The solutions obtained display properties typical of polyelectrolytes, including strong curvature in plots of reduced viscosity (η sp/C) versus concentration (C) at low concentrations. The copolymers exhibit larger reduced viscosity increases in methanol than in DMF, and coil expansion apparently varies in the order G1 > G0 > G2. The reduced viscosity of the arborescent polyelectrolyte solutions is much lower than for linear P2VP samples of comparable molecular weights, however, due to the small dimensions and increased structural rigidity of the molecules. The addition of salts to the branched polyelectrolyte solutions further decreases their viscosity and the curvature of the reduced viscosity plots, presumably as a result of charge screening.

Original languageEnglish
Pages (from-to)3100-3108
Number of pages9
JournalRSC Advances
Volume2
Issue number7
DOIs
Publication statusPublished - Apr 7 2012

Fingerprint

Polystyrenes
Polyelectrolytes
Grafts
Copolymers
Viscosity
Dimethylformamide
Methanol
Molecular weight
Trifluoroacetic acid
Trifluoroacetic Acid
Protonation
Molecular weight distribution
Rigidity
Organic solvents
Screening
Salts
Display devices
poly(2-vinylpyridine)
Molecules
Acids

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Arborescent polystyrene-graft-poly(2-vinylpyridine) copolymers : Solution polyelectrolyte behavior. / Gauthier, Mario; Munam, Abdul.

In: RSC Advances, Vol. 2, No. 7, 07.04.2012, p. 3100-3108.

Research output: Contribution to journalArticle

@article{db53a7fd56924a258caca46e129f5c6c,
title = "Arborescent polystyrene-graft-poly(2-vinylpyridine) copolymers: Solution polyelectrolyte behavior",
abstract = "Branched polyelectrolyte precursors were obtained on a 100 g scale by coupling 'living' poly(2-vinylpyridine) (P2VP) macroanions with linear polystyrene and arborescent polystyrene substrates of generations G0 or G1, functionalized with acetyl groups. Arborescent copolymers with M n ≈ 5000 or 30000 side-chains and containing 87-98 mol{\%} of P2VP were thus synthesized. These materials are characterized by a very compact structure, a narrow molecular weight distribution (M w/M n = 1.08-1.10), and a roughly geometric increase in branching functionality and molecular weight for successive generations. The copolymers are freely soluble in water and in polar organic solvents such as methanol and N,N-dimethylformamide (DMF) upon protonation by trifluoroacetic acid (TFA), a strong acid. The solutions obtained display properties typical of polyelectrolytes, including strong curvature in plots of reduced viscosity (η sp/C) versus concentration (C) at low concentrations. The copolymers exhibit larger reduced viscosity increases in methanol than in DMF, and coil expansion apparently varies in the order G1 > G0 > G2. The reduced viscosity of the arborescent polyelectrolyte solutions is much lower than for linear P2VP samples of comparable molecular weights, however, due to the small dimensions and increased structural rigidity of the molecules. The addition of salts to the branched polyelectrolyte solutions further decreases their viscosity and the curvature of the reduced viscosity plots, presumably as a result of charge screening.",
author = "Mario Gauthier and Abdul Munam",
year = "2012",
month = "4",
day = "7",
doi = "10.1039/c2ra20181j",
language = "English",
volume = "2",
pages = "3100--3108",
journal = "RSC Advances",
issn = "2046-2069",
publisher = "Royal Society of Chemistry",
number = "7",

}

TY - JOUR

T1 - Arborescent polystyrene-graft-poly(2-vinylpyridine) copolymers

T2 - Solution polyelectrolyte behavior

AU - Gauthier, Mario

AU - Munam, Abdul

PY - 2012/4/7

Y1 - 2012/4/7

N2 - Branched polyelectrolyte precursors were obtained on a 100 g scale by coupling 'living' poly(2-vinylpyridine) (P2VP) macroanions with linear polystyrene and arborescent polystyrene substrates of generations G0 or G1, functionalized with acetyl groups. Arborescent copolymers with M n ≈ 5000 or 30000 side-chains and containing 87-98 mol% of P2VP were thus synthesized. These materials are characterized by a very compact structure, a narrow molecular weight distribution (M w/M n = 1.08-1.10), and a roughly geometric increase in branching functionality and molecular weight for successive generations. The copolymers are freely soluble in water and in polar organic solvents such as methanol and N,N-dimethylformamide (DMF) upon protonation by trifluoroacetic acid (TFA), a strong acid. The solutions obtained display properties typical of polyelectrolytes, including strong curvature in plots of reduced viscosity (η sp/C) versus concentration (C) at low concentrations. The copolymers exhibit larger reduced viscosity increases in methanol than in DMF, and coil expansion apparently varies in the order G1 > G0 > G2. The reduced viscosity of the arborescent polyelectrolyte solutions is much lower than for linear P2VP samples of comparable molecular weights, however, due to the small dimensions and increased structural rigidity of the molecules. The addition of salts to the branched polyelectrolyte solutions further decreases their viscosity and the curvature of the reduced viscosity plots, presumably as a result of charge screening.

AB - Branched polyelectrolyte precursors were obtained on a 100 g scale by coupling 'living' poly(2-vinylpyridine) (P2VP) macroanions with linear polystyrene and arborescent polystyrene substrates of generations G0 or G1, functionalized with acetyl groups. Arborescent copolymers with M n ≈ 5000 or 30000 side-chains and containing 87-98 mol% of P2VP were thus synthesized. These materials are characterized by a very compact structure, a narrow molecular weight distribution (M w/M n = 1.08-1.10), and a roughly geometric increase in branching functionality and molecular weight for successive generations. The copolymers are freely soluble in water and in polar organic solvents such as methanol and N,N-dimethylformamide (DMF) upon protonation by trifluoroacetic acid (TFA), a strong acid. The solutions obtained display properties typical of polyelectrolytes, including strong curvature in plots of reduced viscosity (η sp/C) versus concentration (C) at low concentrations. The copolymers exhibit larger reduced viscosity increases in methanol than in DMF, and coil expansion apparently varies in the order G1 > G0 > G2. The reduced viscosity of the arborescent polyelectrolyte solutions is much lower than for linear P2VP samples of comparable molecular weights, however, due to the small dimensions and increased structural rigidity of the molecules. The addition of salts to the branched polyelectrolyte solutions further decreases their viscosity and the curvature of the reduced viscosity plots, presumably as a result of charge screening.

UR - http://www.scopus.com/inward/record.url?scp=84859115589&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859115589&partnerID=8YFLogxK

U2 - 10.1039/c2ra20181j

DO - 10.1039/c2ra20181j

M3 - Article

VL - 2

SP - 3100

EP - 3108

JO - RSC Advances

JF - RSC Advances

SN - 2046-2069

IS - 7

ER -