UMacromolecular architecture effects on block copolymer dynamics: Linear tetrablocks and inverse starblocks

K. Chrissopoulou; Y. Tselikas; S. H. Anastasiadis; G. Fytas; A. N. Semenov; G. Fleischer; N. Hadjichristidis; E. L. Thomas

doi:10.1021/ma9901083

UMacromolecular architecture effects on block copolymer dynamics: Linear tetrablocks and inverse starblocks

K. Chrissopoulou^*, Y. Tselikas, S. H. Anastasiadis, G. Fytas, A. N. Semenov, G. Fleischer, N. Hadjichristidis, E. L. Thomas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Photon correlation spectroscopy and pulsed-field-gradient NMR have been used to investigate the role of different macromolecular architecture on the dynamics of block copolymer solutions in the low wavevector (q) limit using linear tetrablock (TB) and inverse starblock (SB) copolymers composed of two jointed TB's (N_SB = 2N_TB). The three relaxation processes observed for diblocks are also evident in the present case: the cooperative diffusion, the internal copolymer chain relaxation (q²-dependent intensity and qindependent rate), and the polydispersity diffusive mode, controlled by the self-diffusion (due to the finite composition polydispersity). The internal mode characteristics are identical for both systems at a given concentration, in agreement with theoretical estimates for Rouse chains, whereas the selfdiffusivities show the effect of the total molecular weight and the architecture. At high concentrations of the SB copolymers, there is evidence for an extra relaxation process with a strong-concentration-dependent intensity apparently due to the proximity to the ODT and due to the macromolecular architecture.

Original language	English (US)
Pages (from-to)	5115-5126
Number of pages	12
Journal	Macromolecules
Volume	32
Issue number	15
DOIs	https://doi.org/10.1021/ma9901083
State	Published - Jul 27 1999
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "UMacromolecular architecture effects on block copolymer dynamics: Linear tetrablocks and inverse starblocks",

abstract = "Photon correlation spectroscopy and pulsed-field-gradient NMR have been used to investigate the role of different macromolecular architecture on the dynamics of block copolymer solutions in the low wavevector (q) limit using linear tetrablock (TB) and inverse starblock (SB) copolymers composed of two jointed TB's (NSB = 2NTB). The three relaxation processes observed for diblocks are also evident in the present case: the cooperative diffusion, the internal copolymer chain relaxation (q2-dependent intensity and qindependent rate), and the polydispersity diffusive mode, controlled by the self-diffusion (due to the finite composition polydispersity). The internal mode characteristics are identical for both systems at a given concentration, in agreement with theoretical estimates for Rouse chains, whereas the selfdiffusivities show the effect of the total molecular weight and the architecture. At high concentrations of the SB copolymers, there is evidence for an extra relaxation process with a strong-concentration-dependent intensity apparently due to the proximity to the ODT and due to the macromolecular architecture.",

author = "K. Chrissopoulou and Y. Tselikas and Anastasiadis, {S. H.} and G. Fytas and Semenov, {A. N.} and G. Fleischer and N. Hadjichristidis and Thomas, {E. L.}",

year = "1999",

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doi = "10.1021/ma9901083",

language = "English (US)",

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T1 - UMacromolecular architecture effects on block copolymer dynamics

T2 - Linear tetrablocks and inverse starblocks

AU - Chrissopoulou, K.

AU - Tselikas, Y.

AU - Anastasiadis, S. H.

AU - Fytas, G.

AU - Semenov, A. N.

AU - Fleischer, G.

AU - Hadjichristidis, N.

AU - Thomas, E. L.

PY - 1999/7/27

Y1 - 1999/7/27

N2 - Photon correlation spectroscopy and pulsed-field-gradient NMR have been used to investigate the role of different macromolecular architecture on the dynamics of block copolymer solutions in the low wavevector (q) limit using linear tetrablock (TB) and inverse starblock (SB) copolymers composed of two jointed TB's (NSB = 2NTB). The three relaxation processes observed for diblocks are also evident in the present case: the cooperative diffusion, the internal copolymer chain relaxation (q2-dependent intensity and qindependent rate), and the polydispersity diffusive mode, controlled by the self-diffusion (due to the finite composition polydispersity). The internal mode characteristics are identical for both systems at a given concentration, in agreement with theoretical estimates for Rouse chains, whereas the selfdiffusivities show the effect of the total molecular weight and the architecture. At high concentrations of the SB copolymers, there is evidence for an extra relaxation process with a strong-concentration-dependent intensity apparently due to the proximity to the ODT and due to the macromolecular architecture.

AB - Photon correlation spectroscopy and pulsed-field-gradient NMR have been used to investigate the role of different macromolecular architecture on the dynamics of block copolymer solutions in the low wavevector (q) limit using linear tetrablock (TB) and inverse starblock (SB) copolymers composed of two jointed TB's (NSB = 2NTB). The three relaxation processes observed for diblocks are also evident in the present case: the cooperative diffusion, the internal copolymer chain relaxation (q2-dependent intensity and qindependent rate), and the polydispersity diffusive mode, controlled by the self-diffusion (due to the finite composition polydispersity). The internal mode characteristics are identical for both systems at a given concentration, in agreement with theoretical estimates for Rouse chains, whereas the selfdiffusivities show the effect of the total molecular weight and the architecture. At high concentrations of the SB copolymers, there is evidence for an extra relaxation process with a strong-concentration-dependent intensity apparently due to the proximity to the ODT and due to the macromolecular architecture.

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EP - 5126

JO - Macromolecules

JF - Macromolecules

IS - 15

ER -

UMacromolecular architecture effects on block copolymer dynamics: Linear tetrablocks and inverse starblocks

Abstract

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