Model filled polymers. IX. Synthesis of uniformly crosslinked polystyrene microbeads
| Autor: | Shenmin Ma, Zheng-You Ding, Ronald Salovey, Dennis Kriz, J. J. Aklonis |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Dispersity Polymer Microbead (research) Condensed Matter Physics Divinylbenzene Styrene chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Copolymer Polystyrene Physical and Theoretical Chemistry Emulsion copolymerization |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 30:1189-1194 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/polb.1992.090301102 |
| Popis: | Monodisperse sized crosslinked polystyrene (PS) beads prepared 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 mol % DVB and S, within each crosslinked PS microbead, the crosslink density varies by a factor exceeding two and decreases with increased conversion. A semicontinuous copolymerization, involving incremental additions of DVB, produces uniformly crosslinked PS beads. For both copolymerization techniques, Tg correlates well with crosslink density and PS beads are spherical and monodisperse in size. © 1992 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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