Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)

Richard Alan Register, Ashish Sen, Robert A. Weiss, Chi Li, Stuart Cooper

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Carboxy‐terminated polybutadiene neutralized with Cu2+ (CuPBD) and its blend with poly(styrene‐co‐4‐vinylpyridine) (SVP) were examined by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), small‐angle x‐ray scattering (SAXS), and extended x‐ray absorption fine structure (EXAFS) spectroscopy. The DSC results indicate that in the blend substantial mixing occurs in the CuPBD‐rich phase, although complete miscibility is not achieved, and the SVP‐rich phase remains relatively pure. The TEM micrographs indicate that the morphology, while irregular, is reasonably described as bicontinuous, with a domain size of order 100 nm. The SAXS patterns show that the ionic aggregates present in CuPBD are destroyed upon blending, which is interpreted as being due to steric hindrances between ionic groups coordinated to vinylpyridine nitrogens. The EXAFS radial structure function of the blend exhibits a marked decrease in the Cu‐Cu peak in comparison with CuPBD, indicating a change in local structure upon blending. The results indicate that some of the SVP is miscible with CuPBD owing to complexation between the pendant pyridine groups and the Cu2+ ions, which disrupts the ionic aggregates. However, the two materials are not fully miscible, leading to a rather coarse two‐phase morphology.

Original languageEnglish (US)
Pages (from-to)1911-1925
Number of pages15
JournalJournal of Polymer Science Part B: Polymer Physics
Volume27
Issue number9
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

Fingerprint

polybutadiene
Polybutadienes
Cations
Differential scanning calorimetry
Positive ions
Scattering
Transmission electron microscopy
cations
heat measurement
Complexation
fine structure
Pyridine
transmission electron microscopy
Nitrogen
scanning
Solubility
Spectroscopy
Ions
scattering
pyridines

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Chemistry
  • Polymers and Plastics
  • Physical and Theoretical Chemistry

Cite this

@article{35f45d632e954799b55d748886583934,
title = "Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)",
abstract = "Carboxy‐terminated polybutadiene neutralized with Cu2+ (CuPBD) and its blend with poly(styrene‐co‐4‐vinylpyridine) (SVP) were examined by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), small‐angle x‐ray scattering (SAXS), and extended x‐ray absorption fine structure (EXAFS) spectroscopy. The DSC results indicate that in the blend substantial mixing occurs in the CuPBD‐rich phase, although complete miscibility is not achieved, and the SVP‐rich phase remains relatively pure. The TEM micrographs indicate that the morphology, while irregular, is reasonably described as bicontinuous, with a domain size of order 100 nm. The SAXS patterns show that the ionic aggregates present in CuPBD are destroyed upon blending, which is interpreted as being due to steric hindrances between ionic groups coordinated to vinylpyridine nitrogens. The EXAFS radial structure function of the blend exhibits a marked decrease in the Cu‐Cu peak in comparison with CuPBD, indicating a change in local structure upon blending. The results indicate that some of the SVP is miscible with CuPBD owing to complexation between the pendant pyridine groups and the Cu2+ ions, which disrupts the ionic aggregates. However, the two materials are not fully miscible, leading to a rather coarse two‐phase morphology.",
author = "Register, {Richard Alan} and Ashish Sen and Weiss, {Robert A.} and Chi Li and Stuart Cooper",
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Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine). / Register, Richard Alan; Sen, Ashish; Weiss, Robert A.; Li, Chi; Cooper, Stuart.

In: Journal of Polymer Science Part B: Polymer Physics, Vol. 27, No. 9, 01.01.1989, p. 1911-1925.

Research output: Contribution to journalArticle

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AU - Register, Richard Alan

AU - Sen, Ashish

AU - Weiss, Robert A.

AU - Li, Chi

AU - Cooper, Stuart

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AB - Carboxy‐terminated polybutadiene neutralized with Cu2+ (CuPBD) and its blend with poly(styrene‐co‐4‐vinylpyridine) (SVP) were examined by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), small‐angle x‐ray scattering (SAXS), and extended x‐ray absorption fine structure (EXAFS) spectroscopy. The DSC results indicate that in the blend substantial mixing occurs in the CuPBD‐rich phase, although complete miscibility is not achieved, and the SVP‐rich phase remains relatively pure. The TEM micrographs indicate that the morphology, while irregular, is reasonably described as bicontinuous, with a domain size of order 100 nm. The SAXS patterns show that the ionic aggregates present in CuPBD are destroyed upon blending, which is interpreted as being due to steric hindrances between ionic groups coordinated to vinylpyridine nitrogens. The EXAFS radial structure function of the blend exhibits a marked decrease in the Cu‐Cu peak in comparison with CuPBD, indicating a change in local structure upon blending. The results indicate that some of the SVP is miscible with CuPBD owing to complexation between the pendant pyridine groups and the Cu2+ ions, which disrupts the ionic aggregates. However, the two materials are not fully miscible, leading to a rather coarse two‐phase morphology.

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