Accession Number:

ADA237472

Title:

Model Filled Polymers .11. Synthesis of Uniformly Crosslinked Polystyrene Microbeads

Descriptive Note:

Technical rept. no. 9, 1 Sep 1990-1 Jun 1991

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMICAL ENGINEERING

Report Date:

1991-06-10

Pagination or Media Count:

29.0

Abstract:

Monodisperse sized crosslinked polystyrene PS beads by reaction of styrene S and divinylbenzene DVB, in batch emulsion copolymerization in the absence of emulsifiers, are not uniformly crosslinked, because DVB is more reactive than S. For copolymerization of 1 to 10 mole DVB and S, within each crosslinked PS microbead, 7 crosslink density varies by a factor exceeding two and decreases with uniformity crosslinked PS beads. For both copolymerization techniques, T8 correlates well with crosslink density and PS beads are spherical and monodisperse in size.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE