Model Filled Polymers 8. Synthesis of Crosslinked Polymeric Beads by Seed Polymerization
Abstract
Monodisperse crosslinked polystyrene (PS) and polymethacrylate (PMA) beads of sizes greater than 1 micron in diameter are prepared by particle nucleation onto pre-existing polymer seeds in a multistage emulsion polymerization, in the absence of emulsifier. An adequate seed concentration, which decreases with increasing seed size, is necessary to achieve monodisperse beads. Monodisperse multicomposition beads are prepared by polymerizing styrene onto PMA seeds, but not by polymerizing methyl methacrylate onto PS seeds. Free radical capture by growing seed particles with surface polymerization may lead to the formation of asymmetric shaped particles.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1991
- Accession Number
- ADA237429
Entities
People
- Dezhong Zou
- J. J. Aklonis
- Liqing Sun
- R. Salovey
Organizations
- University of Southern California