Self-assembly and optical property of triblock copolymers made of polystyrene and oligo(p-phenyleneethynylene) in different mixtures of toluene and hexane

Hong Huo, Kun Li, Qing Wang, Chi Wu

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Using a combination of laser light scattering (LLS), UV-vis, and fluorescence spectrometry methods, we comparatively examined the self-assembly and optical property of two triblock copolymers made of polystyrene (PS, coillike) and oligo(p-phenyleneethynylene) (OPE, rodlike) in different mixtures of toluene and hexane. For the coil-rod-coil (PS-OPE-PS) triblock copolymer, intrachain wrapping of the two soluble PS coil blocks on the insoluble middle OPE rod block in the solvent mixture reduces the π-π stacking of OPE and makes it more planar, resulting in a red shift in its UV-vis and fluorescence spectra, presumably, due to the J-type aggregation. While for the rod-coil-rod (OPE-PS-OPE) triblock copolymer, two intrachain stacked insoluble OPE blocks are wrapped and stabilized by the soluble middle PS block in toluene. The addition of hexane, a nonsolvent of PS, leads to further interchain aggregation of OPE, resulting in large polymeric micelles with an insoluble OPE core and a soluble PS shell. The blue shift in its UV-vis and fluorescence spectra reflects that intrachain stacking and interchain packing of OPE in the core are mainly H-type; i.e., they are parallel to each other, which increases the π-π interaction of OPE.

Original languageEnglish (US)
Pages (from-to)6692-6698
Number of pages7
JournalMacromolecules
Volume40
Issue number18
DOIs
StatePublished - Sep 4 2007

Fingerprint

Polystyrenes
Toluene
Hexanes
Hexane
Self assembly
Block copolymers
Optical properties
Fluorescence
Agglomeration
Micelles
Light scattering
Spectrometry
Lasers
phenyleneethynylene

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

@article{d68482eeae6b4bf7945567b39083e80b,
title = "Self-assembly and optical property of triblock copolymers made of polystyrene and oligo(p-phenyleneethynylene) in different mixtures of toluene and hexane",
abstract = "Using a combination of laser light scattering (LLS), UV-vis, and fluorescence spectrometry methods, we comparatively examined the self-assembly and optical property of two triblock copolymers made of polystyrene (PS, coillike) and oligo(p-phenyleneethynylene) (OPE, rodlike) in different mixtures of toluene and hexane. For the coil-rod-coil (PS-OPE-PS) triblock copolymer, intrachain wrapping of the two soluble PS coil blocks on the insoluble middle OPE rod block in the solvent mixture reduces the π-π stacking of OPE and makes it more planar, resulting in a red shift in its UV-vis and fluorescence spectra, presumably, due to the J-type aggregation. While for the rod-coil-rod (OPE-PS-OPE) triblock copolymer, two intrachain stacked insoluble OPE blocks are wrapped and stabilized by the soluble middle PS block in toluene. The addition of hexane, a nonsolvent of PS, leads to further interchain aggregation of OPE, resulting in large polymeric micelles with an insoluble OPE core and a soluble PS shell. The blue shift in its UV-vis and fluorescence spectra reflects that intrachain stacking and interchain packing of OPE in the core are mainly H-type; i.e., they are parallel to each other, which increases the π-π interaction of OPE.",
author = "Hong Huo and Kun Li and Qing Wang and Chi Wu",
year = "2007",
month = "9",
day = "4",
doi = "10.1021/ma071247k",
language = "English (US)",
volume = "40",
pages = "6692--6698",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "18",

}

Self-assembly and optical property of triblock copolymers made of polystyrene and oligo(p-phenyleneethynylene) in different mixtures of toluene and hexane. / Huo, Hong; Li, Kun; Wang, Qing; Wu, Chi.

In: Macromolecules, Vol. 40, No. 18, 04.09.2007, p. 6692-6698.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Self-assembly and optical property of triblock copolymers made of polystyrene and oligo(p-phenyleneethynylene) in different mixtures of toluene and hexane

AU - Huo, Hong

AU - Li, Kun

AU - Wang, Qing

AU - Wu, Chi

PY - 2007/9/4

Y1 - 2007/9/4

N2 - Using a combination of laser light scattering (LLS), UV-vis, and fluorescence spectrometry methods, we comparatively examined the self-assembly and optical property of two triblock copolymers made of polystyrene (PS, coillike) and oligo(p-phenyleneethynylene) (OPE, rodlike) in different mixtures of toluene and hexane. For the coil-rod-coil (PS-OPE-PS) triblock copolymer, intrachain wrapping of the two soluble PS coil blocks on the insoluble middle OPE rod block in the solvent mixture reduces the π-π stacking of OPE and makes it more planar, resulting in a red shift in its UV-vis and fluorescence spectra, presumably, due to the J-type aggregation. While for the rod-coil-rod (OPE-PS-OPE) triblock copolymer, two intrachain stacked insoluble OPE blocks are wrapped and stabilized by the soluble middle PS block in toluene. The addition of hexane, a nonsolvent of PS, leads to further interchain aggregation of OPE, resulting in large polymeric micelles with an insoluble OPE core and a soluble PS shell. The blue shift in its UV-vis and fluorescence spectra reflects that intrachain stacking and interchain packing of OPE in the core are mainly H-type; i.e., they are parallel to each other, which increases the π-π interaction of OPE.

AB - Using a combination of laser light scattering (LLS), UV-vis, and fluorescence spectrometry methods, we comparatively examined the self-assembly and optical property of two triblock copolymers made of polystyrene (PS, coillike) and oligo(p-phenyleneethynylene) (OPE, rodlike) in different mixtures of toluene and hexane. For the coil-rod-coil (PS-OPE-PS) triblock copolymer, intrachain wrapping of the two soluble PS coil blocks on the insoluble middle OPE rod block in the solvent mixture reduces the π-π stacking of OPE and makes it more planar, resulting in a red shift in its UV-vis and fluorescence spectra, presumably, due to the J-type aggregation. While for the rod-coil-rod (OPE-PS-OPE) triblock copolymer, two intrachain stacked insoluble OPE blocks are wrapped and stabilized by the soluble middle PS block in toluene. The addition of hexane, a nonsolvent of PS, leads to further interchain aggregation of OPE, resulting in large polymeric micelles with an insoluble OPE core and a soluble PS shell. The blue shift in its UV-vis and fluorescence spectra reflects that intrachain stacking and interchain packing of OPE in the core are mainly H-type; i.e., they are parallel to each other, which increases the π-π interaction of OPE.

UR - http://www.scopus.com/inward/record.url?scp=34748921199&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34748921199&partnerID=8YFLogxK

U2 - 10.1021/ma071247k

DO - 10.1021/ma071247k

M3 - Article

AN - SCOPUS:34748921199

VL - 40

SP - 6692

EP - 6698

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 18

ER -