M- AND p-VINYLTOLUENE

This test method will detect the following impurities non-aromatic hydrocarbons containing ten carbons or less, ethylbenzene, p- and m-xylene, cumene, o-xylene, n-propylbenzene, m- and p-ethyltoluene, alpha-methyl-styrene, m- and p-vinyltoluene and others where specific impurity standards are available. Absolute purity cannot be determined if unknown impurities are present. 

Vinyltoluene n. H2C=CHC6H4CH3. A colorless liquid, the commercial forms comprising a 60 40 mixture of the m- and p-isomers, used as a solvent and as a polymerizable monomer in place of styrene in the production of polyester resins See image). 

Bagchi, P., and Birnbaum, S.M. (1981) Effect of pH on the adsorption of immunoglobulin G on anionic poly(vinyltoluene) model latex particles./. Colloid Interface Sci. 83, 460 178. 

Note Normally inhibited with 8-12 ppm 4-7er7-butylcatechol to prevent polymerization. According to Chevron Phillips Company (March 2002), 99.93% styrene contains the following components (ppm) benzene (<1), toluene (<1), ethylbenzene (50), a-meth ylstyrene (175), m + p-xylene (120), o-xylene (125), isopropylbenzene (100), / -propylbenzene (60), m + p-ethyltoluene (20), vinyltoluene (10), phenylacetylene (50), m + p-divinylbenzene (<10), o-divinylbenzene (<5), aldehydes as benzaldehyde (15), and peroxides as benzoyl-peroxides (5). 

---