Enhanced segregation of a diblock copolymer caused by hydrogen bonding

Journal Article · Mon Aug 29 00:00:00 EDT 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00096a049· OSTI ID:7153040

Dai, K H; Kramer, E J; Frechet, J M.J.; Wilson, P G ^[1]; Moore, R S; Long, T E ^[2]

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1. Cornell Univ., Ithaca, NY (United States)
2. Eastman Kodak Co., Rochester, NY (United States). Research Labs.

Utilizing forward recoil spectrometry (FRES), the authors have determined the segregation isotherm which describes the interfacial excess z of diblock copolymers of poly(d[sub 8]-styrene-b-2-vinylpyridine) [dPS-PVP] 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 [phi][sub [infinity]], 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 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.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7153040
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 27:18; ISSN MAMOBX; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
AZINES
CHEMICAL BONDS
COPOLYMERS
HETEROCYCLIC COMPOUNDS
INTERFACES
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
PYRIDINES
SEGREGATION
SYNTHETIC MATERIALS