Description α-Methylstyrene (AMS) is a chemical intermediate used in the manufacture of plasticizers, resins and polymers. It is a co-product formed in a variation of the cumene process. The homopolymer obtained from this monomer, poly(α-methylstyrene), is unstable, being characterized by a low ceiling temperature. Basic Info Chemical Name 2-Phenyl-1-propene Synonyms 2-phenyl-1-propen; 1-methyl-1-phenylethene; 2-methyl-2-phenylethene; Benzene, (1-methylethenyl)-; AMS; Expand CAS No. 98-83-9 Molecular Formula C9H10 Molecular Weight 118.17600 PSA 0.00000 LogP 2.71970 Properties Appearance & Physical State clear to yellow liquid Density 0.909 Boiling Point 165-169ºC Melting Point -23ºC Flash Point 45ºC Refractive Index 1.537-1.539 Water Solubility insoluble Storage Condition 2-8ºC Vapor Density 4.1 (vs air) Vapor Pressure 2.1 mm Hg ( 20 °C) |