𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Cationic coating polymerization of cyclopentadiene onto silica particles

✍ Scribed by Stefan Spange; Elke Langhammer

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
992 KB
Volume
198
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The cationic polymerization of cyclopentadiene (CPD) initiated by different initiators (triphenylmethyl chloride, triphenylmethyl bromide, methyl triflate, and trifluoroacetic acid) onto silica particles yields polycyclopentadiene (PCPD)‐silica composites in high yield beside small amounts of soluble polymers. The novel PCPD‐silica particles are characterized by UV/VIS reflectance spectra and IR spectra. The percentage of coating (PG) is determined by combustion analysis and depends on the reaction temperature and the technical procedure of the polymerization. The influence of the initiator used and initiator/monomer ratio on the PG of the silica particles are investigated, too. It can be shown that the total amount of coating strongly depends on the initiator used. In case of trifluoroacetic acid initiation, particle aggregation takes place if the carbon content of the PCPD particles exceeds 15% carbon weight due to crosslinking between the PCPD layers of the coated silica particles, as evidenced by electron scanning microscopy.

πŸ“œ SIMILAR VOLUMES

Coating of Nanosize Silver Particles wit
Coating of Nanosize Silver Particles with Silica
✍ Vishwas V. Hardikar; Egon MatijeviΔ‡ πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 115 KB

The formation of silica shells on core silver particles by a modified St ΓΆber process was investigated and the coated particles were characterized using UV-visible spectroscopy, transmission electron microscopy, and electrophoresis. The deposition conditions, such as reagent concentrations and react

Preparation of Iron Particles Coated wit
Preparation of Iron Particles Coated with Silica
✍ Guihua Wang; Andrew Harrison πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 119 KB

## Preparation of Iron Particles Coated with Silica A method is described for coating fine iron particles (Ο³1 m) with a uniform silica layer, produced by the hydrolysis of tetraethyl orthosilicate. The presence of a small amount of gelatin on the surface of the iron particles facilitates this proc