Accession Number:

ADA172457

Title:

A Reexamination of Single Chain Scattering in Heterogeneous Block Copolymers.

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING

Personal Author(s):

• Berney,C. V.
• Kofinas,P.
• Cohen,R. E.

Report Date:

1986-09-01

Pagination or Media Count:

12.0

Abstract:

Calculations utilizing a scattering formalism due to deGennes are compared with previously-reported SANS data from two polystyrene-polybutadiene samples which have been blended with similar diblocks in which the B segment is deuterated. The present conclusion is that both the lower- and higher- molecular-weight samples exhibit scattering in excess of that predicted, presumably due to clustering of the labelled chains or some other chain-length dependent phenomenon. Keywords small angle neutron scattering.

Descriptors:

• *BLOCK COPOLYMERS
• *POLYSTYRENE
• *POLYBUTADIENE
• *NEUTRON SCATTERING
• ANGLES
• MOLECULAR WEIGHT
• CLUSTERING
• CHAINS
• HETEROGENEITY
• LABELED SUBSTANCES

Subject Categories:

• Plastics
• Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE