Styrene Monomer, also known as ethenylbenzene, vinylbenzene, and phenylethene, is an organic compound with the chemical formula C6H5CH=CH2. This derivative of benzene is a colorless oily liquid that evaporates easily and has a sweet smell, although high concentrations have a less pleasant odor. Styrene Monomer is the precursor to polystyrene and several copolymers.
Specifications
| Names | |
|---|---|
| Preferred IUPAC namePhenylethene | |
| Other namesVinyl benzene; cinnamene; styrol; phenylethene; diarex HF 77; styrolene; styropol; vinylbenzene; phenylethylene | |
| Identifiers | |
| CAS Number | 100-42-5 |
| ChEBI | CHEBI:27452 |
| ChEMBL | ChEMBL285235 |
| ChemSpider | 7220 |
| Jmol interactive 3D | |
| KEGG | |
| PubChem | 7501 |
| RTECS number | WL3675000 |
| UNII | 44LJ2U959V |
| InChI | |
| SMILES | |
| Properties of Styrene Monomer | |
| Chemical formula | C8H8 |
| Molar mass | 104.15 g/mol |
| Appearance | colorless oily liquid |
| Odor | sweet, floral[1] |
| Density | 0.909 g/cm3 |
| Melting point | −30 °C (−22 °F; 243 K) |
| Boiling point | 145 °C (293 °F; 418 K) |
| Solubility in water | 0.03% (20°C)[1] |
| Vapor pressure | 5 mmHg (20°C)[1] |
| Refractive index(nD) | 1.5469 |
| Viscosity | 0.762 cP at 20 °C |
| Structure | |
| Dipole moment | 0.13 D |
| Hazards | |
| Main hazards | flammable, toxic |
| Safety data sheet | |
| R-phrases | R10 R36 |
| S-phrases | S38 S20 S23 |
| NFPA 704 | 322 |
| Flash point | 31 °C (88 °F; 304 K) |
| Explosive limits | 0.9%-6.8%[1] |
| Lethal dose or concentration (LD, LC): | |
| LC50 (Median concentration) | 2194 ppm (mouse, 4 hr) 5543 ppm (rat, 4 hr)[2] |
| LCLo (Lowest published) | 10,000 ppm (human, 30 min) 2771 ppm (rat, 4 hr)[2] |
| US health exposure limits (NIOSH): | |
| PEL (Permissible) | TWA 100 ppm C 200 ppm 600 ppm (5-minute maximum peak in any 3 hours)[1] |
| REL (Recommended) | TWA 50 ppm (215 mg/m3) ST 100 ppm (425 mg/m3)[1] |
| IDLH (Immediate danger | 700 ppm[1] |
| Related compounds | |
| Related styrenes; related aromaticcompounds |
Polystyrene, Stilbene; Ethylbenzene |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
