Accession Number:

ADA183317

Title:

Distribution of Matrix Homopolymer in Block Copolymers of Spherical Morphology.

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY

Personal Author(s):

• Berney,C. V.
• Cheng,Paul
• Cohen,R. E.

Report Date:

1987-07-29

Pagination or Media Count:

27.0

Abstract:

Samples made by blending deuterated polystyrene Sd of three different molecular weights with a polystyrene-polybutadiene block copolymer SB were studied with small-angle scattering techniques using X-rays SAXS and neutrons SANS. The SANS results were sensitive both to the amount of added homopolymer Sd and to its chain length. Anomalously high SANS intensities and the absence of an intraparticle scattering maximum are consistent with the exclusion of added Sd from the corona of the SB micelles, resulting in Sd enrichment of the interstitial regions. Keywords Block copolymers, Polymer chain configuration.

Descriptors:

• *BLOCK COPOLYMERS
• *POLYSTYRENE
• ANGLES
• CHAINS
• COLLOIDS
• DEUTERIUM COMPOUNDS
• INDEX TERMS
• INTERSTITIAL
• LENGTH
• MOLECULAR WEIGHT
• NEUTRONS
• POLYMERS
• SCATTERING

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE