2-Phenyl-1-propene Chemical Properties
- Melting point:
- −24 °C(lit.)
- Boiling point:
- 165-169 °C(lit.)
- 0.909 g/mL at 25 °C(lit.)
- vapor density
- 4.1 (vs air)
- vapor pressure
- 2.1 mm Hg ( 20 °C)
- refractive index
- Flash point:
- 114 °F
- storage temp.
- Clear colorless
- 5-6 (500g/l, H2O)
- explosive limit
- Water Solubility
- Exposure limits
- NIOSH REL: TWA 50 ppm (240 mg/m3), STEL 100 ppm (485 mg/m3), IDLH 700 ppm; OSHA PEL: ceiling 100 ppm; ACGIH TLV: TWA 50 ppm, STEL 100 ppm (adopted).
- CAS DataBase Reference
- 98-83-9(CAS DataBase Reference)
- NIST Chemistry Reference
- EPA Substance Registry System
- .alpha.-Methylstyrene (98-83-9)
- Hazard Codes
- Risk Statements
- Safety Statements
- UN 2303 3/PG 3
- WGK Germany
- Autoignition Temperature
- 445 °C
- HS Code
- 2902 90 00
- Hazardous Substances Data
- 98-83-9(Hazardous Substances Data)
- LD50 orally in Rabbit: 4900 mg/kg
2-Phenyl-1-propene Usage And Synthesis
clear colourless liquid
Methylstyrene is a colorless liquid with a characteristic odor.
Colorless liquid with a sharp aromatic odor. Odor threshold concentration is 290 ppb (quoted, Amoore and Hautala, 1983).
Intermediate for ABS plastics, Styrene - Butadiene rubber, Polystyrene, Styrene - Acrylonitrile Resins, Perfumery, Polyalphamethyl Styrene, Polyester resins
Polymerization monomer, especially forpolyesters.
α-Methylstyrene is not a styrenic monomer in the strict sense. The methyl substitution on the side chain, rather than the aromatic ring, moderates its reactivity in polymerization. It is used as a specialty monomer in ABS resins, coatings, polyester resins, and hot-melt adhesives. As a copolymer in ABS and polystyrene, it increases the heat-distortion resistance of the product. In coatings and resins, it moderates reaction rates and improves clarity.
α-Methylstyrene (AMS) is produced as a by-product in the production of phenol and acetone from cumene.
A colorless liquid. Insoluble in water and less dense than water. Flash point 115°F. May be mildly toxic by ingestion, inhalation and skin absorption. Vapors may be narcotic by inhalation. Used as a solvent and to make other chemicals.
Air & Water Reactions
Flammable. Oxidizes readily in air to form unstable peroxides that may explode spontaneously [Bretherick, 1979 p.151-154, 164]. Insoluble in water.
2-Phenyl-1-propene is easily peroxidizable; the peroxide may initiate exothermic polymerization of the bulk material. Reacts violently with strong oxidizing agents [Handling Chemicals Safely, 1980 p. 866; Bretherick, 1979 p. 160].
Moderate fire risk. Explosive limits in air1.9–6.1%. Avoid inhalation and skin contact. Upperrespiratory tract irritant, kidney and female repro-ductive damage. Possible carcinogen.
Inhalation causes irritation of respiratory tract, headache, dizziness, light-headedness, and breathlessness. Ingestion causes irritation of mouth and stomach. Contact with liquid irritates eyes. Prolonged skin contact can cause severe rashes, swelling, and blistering.
Mildly toxic by inhalation. Human systemic effects by inhalation: irritant effects. A skin and eye irritant. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. When heated to decomposition it emits acrid smoke and irritating fumes.
Methylstyrene is used as additive, plasticizer, and copolymer; used in the production of modified polyester and alkyd resin formulations.
Chemical/Physical. Polymerizes in the presence of heat or catalysts (Hawley, 1981).
UN2303 Isopropenylbenzene, Hazard Class: 3; Labels: 3-Flammable liquid
Wash the monomer three times with aqueous 10% NaOH (to remove inhibitors such as quinol), then six times with distilled water, dry with CaCl2 and distil it unde
Vapors may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, peroxides, halogens, catalysts for vinyl or ionic polymers; aluminum, iron chloride; copper. Methylstyrene may form unstable peroxides; may polymerize. Usually contains an inhibitor, such as tert-butyl catechol.
ncineration, often by admixture with a more flammable solvent
- POLY(N-ISOPROPYL ACRYLAMIDE)
- Vinylbenzyl chloride
- Cefprozil hydrate
- PHENYL VALERATE
- 4-Vinylbenzyl chloride
- (ALPHA,GAMMA-BISDIPHENYLENE-BETA-PHENYLALLYL), FREE RADICAL
- beta-Methylphenethyl alcohol
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