Dielectric Studies of Poly(ethylene oxide)/Poly(styrene-co-p-hydroxystyrene) Blends: Influence of Hydrogen Bonding on the Dynamics of Amorphous Blends

Xing Jin, Shihai Zhang, James Patrick Runt

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The segmental dynamics of a poly(styrene-co-p-hydroxystyrene) random copolymer [SHS, 50 wt % HS] and its amorphous, melt-miscible blends with poly(ethylene oxide) were investigated using broadband dielectric relaxation spectroscopy. The fragility of the neat copolymer was found to be close to that of polystyrene with comparable molecular weight, consistent with the idea that intramolecular hydrogen bonding primarily enhances the monomer friction coefficient and Tg, while having little effect on fragility. Despite the large mobility difference between the component polymers, a single cooperative segmental relaxation is observed for the blends (SHS concentration ≥ 60%), demonstrating the coupling ability of intermolecular hydrogen bonds. Blend fragility increased significantly with SHS content, reflecting the combined contribution of the two components. The most intriguing finding was a fast process in blends containing ≥80 wt % SHS. The available evidence supports its assignment to noncooperative segmental relaxation of PEO repeat units, having some similarities to the modified segmental dynamics of nanoconfined polymers.

Original languageEnglish (US)
Pages (from-to)8033-8039
Number of pages7
JournalMacromolecules
Volume36
Issue number21
DOIs
StatePublished - Oct 21 2003

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Styrene
Polyethylene oxides
Hydrogen bonds
Polymers
Copolymers
Dielectric relaxation
Polystyrenes
Monomers
Molecular weight
Spectroscopy
Friction

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The segmental dynamics of a poly(styrene-co-p-hydroxystyrene) random copolymer [SHS, 50 wt {\%} HS] and its amorphous, melt-miscible blends with poly(ethylene oxide) were investigated using broadband dielectric relaxation spectroscopy. The fragility of the neat copolymer was found to be close to that of polystyrene with comparable molecular weight, consistent with the idea that intramolecular hydrogen bonding primarily enhances the monomer friction coefficient and Tg, while having little effect on fragility. Despite the large mobility difference between the component polymers, a single cooperative segmental relaxation is observed for the blends (SHS concentration ≥ 60{\%}), demonstrating the coupling ability of intermolecular hydrogen bonds. Blend fragility increased significantly with SHS content, reflecting the combined contribution of the two components. The most intriguing finding was a fast process in blends containing ≥80 wt {\%} SHS. The available evidence supports its assignment to noncooperative segmental relaxation of PEO repeat units, having some similarities to the modified segmental dynamics of nanoconfined polymers.",
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Dielectric Studies of Poly(ethylene oxide)/Poly(styrene-co-p-hydroxystyrene) Blends : Influence of Hydrogen Bonding on the Dynamics of Amorphous Blends. / Jin, Xing; Zhang, Shihai; Runt, James Patrick.

In: Macromolecules, Vol. 36, No. 21, 21.10.2003, p. 8033-8039.

Research output: Contribution to journalArticle

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AU - Jin, Xing

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N2 - The segmental dynamics of a poly(styrene-co-p-hydroxystyrene) random copolymer [SHS, 50 wt % HS] and its amorphous, melt-miscible blends with poly(ethylene oxide) were investigated using broadband dielectric relaxation spectroscopy. The fragility of the neat copolymer was found to be close to that of polystyrene with comparable molecular weight, consistent with the idea that intramolecular hydrogen bonding primarily enhances the monomer friction coefficient and Tg, while having little effect on fragility. Despite the large mobility difference between the component polymers, a single cooperative segmental relaxation is observed for the blends (SHS concentration ≥ 60%), demonstrating the coupling ability of intermolecular hydrogen bonds. Blend fragility increased significantly with SHS content, reflecting the combined contribution of the two components. The most intriguing finding was a fast process in blends containing ≥80 wt % SHS. The available evidence supports its assignment to noncooperative segmental relaxation of PEO repeat units, having some similarities to the modified segmental dynamics of nanoconfined polymers.

AB - The segmental dynamics of a poly(styrene-co-p-hydroxystyrene) random copolymer [SHS, 50 wt % HS] and its amorphous, melt-miscible blends with poly(ethylene oxide) were investigated using broadband dielectric relaxation spectroscopy. The fragility of the neat copolymer was found to be close to that of polystyrene with comparable molecular weight, consistent with the idea that intramolecular hydrogen bonding primarily enhances the monomer friction coefficient and Tg, while having little effect on fragility. Despite the large mobility difference between the component polymers, a single cooperative segmental relaxation is observed for the blends (SHS concentration ≥ 60%), demonstrating the coupling ability of intermolecular hydrogen bonds. Blend fragility increased significantly with SHS content, reflecting the combined contribution of the two components. The most intriguing finding was a fast process in blends containing ≥80 wt % SHS. The available evidence supports its assignment to noncooperative segmental relaxation of PEO repeat units, having some similarities to the modified segmental dynamics of nanoconfined polymers.

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