Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding

Kevin H. Dai; Edward J. Kramer; Jean M.J. Fréchet; Paul G. Wilson; Robert S. Moore; Timothy E. Long

doi:10.1021/ma00096a049

Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding

Kevin H. Dai, Edward J. Kramer, Jean M.J. Fréchet, Paul G. Wilson, Robert S. Moore, Timothy E. Long

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

16 Scopus citations

Abstract

Utilizing forward recoil spectrometry (FRES), we have determined the segregation isotherm which describes the interfacial excess z_i* of diblock copolymers of poly(d₈-styrene-b-2-vinylpyridine) [dPSPVP] at the interface between the PS/PVP, PS/poly(4-vinyl phenol) [PS/PVPh], and PS/poly(4-vinylbenzoic acid) [PS/PVBA] as a function of ϕ_∞, the volume fraction of diblock copolymer remaining in the host PS phase after annealing the specimens to reach the equilibrium segregation. A remarkable increase in the saturation Z_i* is observed at the PS/PVBA and the PS/PVPh interfaces as compared to that at the corresponding PS/PVP interface. This enhanced segregation is caused by an attraction due to the formation of hydrogen bonds of the PVP block with PVBA and PVPh homopolymers. The segment density profile of copolymer at the PS/PVBA interface determined by neutron reflectometry indicates that the interface is almost totally occupied by the copolymer and the copolymer chains at the interface are highly stretched. This result suggests that the interface is close to the “brush” structure as pictured by Leibler.

Original language	English (US)
Pages (from-to)	5187-5191
Number of pages	5
Journal	Macromolecules
Volume	27
Issue number	18
DOIs	https://doi.org/10.1021/ma00096a049
State	Published - Aug 1 1994
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding",

abstract = "Utilizing forward recoil spectrometry (FRES), we have determined the segregation isotherm which describes the interfacial excess zi* of diblock copolymers of poly(d8-styrene-b-2-vinylpyridine) [dPSPVP] at the interface between the PS/PVP, PS/poly(4-vinyl phenol) [PS/PVPh], and PS/poly(4-vinylbenzoic acid) [PS/PVBA] as a function of ϕ∞, the volume fraction of diblock copolymer remaining in the host PS phase after annealing the specimens to reach the equilibrium segregation. A remarkable increase in the saturation Zi* is observed at the PS/PVBA and the PS/PVPh interfaces as compared to that at the corresponding PS/PVP interface. This enhanced segregation is caused by an attraction due to the formation of hydrogen bonds of the PVP block with PVBA and PVPh homopolymers. The segment density profile of copolymer at the PS/PVBA interface determined by neutron reflectometry indicates that the interface is almost totally occupied by the copolymer and the copolymer chains at the interface are highly stretched. This result suggests that the interface is close to the “brush” structure as pictured by Leibler.",

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AU - Moore, Robert S.

AU - Long, Timothy E.

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Y1 - 1994/8/1

N2 - Utilizing forward recoil spectrometry (FRES), we have determined the segregation isotherm which describes the interfacial excess zi* of diblock copolymers of poly(d8-styrene-b-2-vinylpyridine) [dPSPVP] at the interface between the PS/PVP, PS/poly(4-vinyl phenol) [PS/PVPh], and PS/poly(4-vinylbenzoic acid) [PS/PVBA] as a function of ϕ∞, the volume fraction of diblock copolymer remaining in the host PS phase after annealing the specimens to reach the equilibrium segregation. A remarkable increase in the saturation Zi* is observed at the PS/PVBA and the PS/PVPh interfaces as compared to that at the corresponding PS/PVP interface. This enhanced segregation is caused by an attraction due to the formation of hydrogen bonds of the PVP block with PVBA and PVPh homopolymers. The segment density profile of copolymer at the PS/PVBA interface determined by neutron reflectometry indicates that the interface is almost totally occupied by the copolymer and the copolymer chains at the interface are highly stretched. This result suggests that the interface is close to the “brush” structure as pictured by Leibler.

AB - Utilizing forward recoil spectrometry (FRES), we have determined the segregation isotherm which describes the interfacial excess zi* of diblock copolymers of poly(d8-styrene-b-2-vinylpyridine) [dPSPVP] at the interface between the PS/PVP, PS/poly(4-vinyl phenol) [PS/PVPh], and PS/poly(4-vinylbenzoic acid) [PS/PVBA] as a function of ϕ∞, the volume fraction of diblock copolymer remaining in the host PS phase after annealing the specimens to reach the equilibrium segregation. A remarkable increase in the saturation Zi* is observed at the PS/PVBA and the PS/PVPh interfaces as compared to that at the corresponding PS/PVP interface. This enhanced segregation is caused by an attraction due to the formation of hydrogen bonds of the PVP block with PVBA and PVPh homopolymers. The segment density profile of copolymer at the PS/PVBA interface determined by neutron reflectometry indicates that the interface is almost totally occupied by the copolymer and the copolymer chains at the interface are highly stretched. This result suggests that the interface is close to the “brush” structure as pictured by Leibler.

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Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding

Abstract

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