Model Filled Polymers I. Synthesis of Crosslinked Monodisperse Polystyrene Beads
Abstract
Monodisperse crosslinked polystyrene beads of varied size and crosslink density are prepared by emulsion copolymerization of styrene and divinylbenzene in the absence of emulsifier. Tumbling and internally stirred reactors were used for synthesis, with minimal agglomeration at least 0.22 weight percent potassium persulfate and up to 10 percent by weight of styrene in aqueous emulsion in the absence of oxygen. Particle sizes decreased from 800 to 200 nm on raising the polymerization temperature form 60 to 95 C. The glass transition temperature of the beads increased from 104.4 to 133 C by the inclusion of up to 10% by weight of divinylbenzene. The thermal stability of the beads was higher for peroxide than for persulfate initiation. The crosslink density estimated from the degree of swelling was about one third that expected from stoichiometry. The polystyrene beads are used as filler particles in polymer composites. Keywords: Polymer composites; Filled polymers; Emulsion polymerization; Polymer synthesis; Monodisperse polystyrene beads; Crosslinked networks. (JES)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 16, 1989
- Accession Number
- ADA213228
Entities
People
- D. Kriz
- D. Zou
- Garam Kim
- J. J. Aklonis
- K. Gandhi
- Liuyang Sun
- M. Park
- R. Salovey
- Y. D. Lee
Organizations
- University of Southern California