Distributions of chain ends and junction points in ordered block copolymers

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00057a026· OSTI ID:6784656

Mayes, A M; Johnson, R D; Russell, T P ^[1]; Smith, S D ^[2]; Satija, S K; Majkrzak, C F ^[3]

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1. IBM Research Div., San Jose, CA (United States)
2. Procter and Gamble Co., Cincinnati, OH (United States)
3. National Inst. of Standards and Technology, Gaithersburg, MD (United States)

Chain configurations in ordered symmetric poly(styrene-b-methyl methacrylate) diblock copolymers were examined by neutron reflectively. In a thin-film geometry the copolymers organize into lamellar microdomains oriented parallel to the substrate surface. The copolymers organize into lamellar microdomains oriented parallel to the substrate surface. The copolymers were synthesized with small fractions of deuterated segments at either the chain ends or centers. This selective labeling permitted characterization of the spatial distribution of chain ends and junction points normal to the plane of the film. From the reflectivity analysis, the junction points are found to be confined to the PS/PMMA interfacial regions. The chain ends, however, are well distributed through their respective domains, exhibiting only a weak maximum in concentration at the center of the domains.

• DOE Contract Number: FG03-88ER45375
• OSTI ID: 6784656
• Journal Information: Macromolecules; (United States), Vol. 26:5; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPOLYMERS
MOLECULAR STRUCTURE
PMMA
DEUTERIUM
NEUTRONS
SCATTERING
SYNTHESIS
BARYONS
ELEMENTARY PARTICLES
ESTERS
FERMIONS
HADRONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYACRYLATES
POLYMERS
POLYVINYLS
STABLE ISOTOPES
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures