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B A Lasoski

Publications and source records attributed to B A Lasoski.

3 recordsLinked to original sources
PubMed1980

Dialkylnitrosamines in elastomers.

Accelerators and stabilizers used in natural rubber and many types of synthetic rubber are often derived from dialkylamines. It has been found that raw polymers, compounded uncured elastomers, and cured rubber parts containing these dialkylamino compounds emit low concentrations of the corresponding dialkylnitrosamine (R2N-N = O) when they are heated. Exposure of operators working with these materials can be reduced below a level of 50 parts per trillion by volume in air by use of ventilation velocities of about 50 ft/min. around the operation. The analytical method is described.

Elastomers↗
PubMed1980

Aqueous extraction of N-nitrosamines from elastomers.

Elastomers compounded with accelerators or stabilizers derived from dialkylamines have been found to contain the corresponding N-nitrosodialkylamines. Previous work showed that the N-nitrosamines are evolved from heated elastomers; we have not found they are also extractable in water. In the absence of the dialkylamino compound in the elastomer, no N-nitrosodialkylamines were detected. Generally, less than 250 parts of N-nitrosamine per billion parts of elastomer was detected after extracting for one or five days at room temperature or 100 degrees C. Compounded and cured polychloroprene, ethylene-propylene-diene terpolymer, chlorosulfonated polyethylene, and natural rubber, as well as several commercial rubber articles, were included in this study. Controls were run to determine the background levels of N-nitrosamines and the recovery of N-nitrosamines from the extraction solvent. N-nitrosamines were quantitated using gas chromatography with thermal energy analyzer detection.

Chromatography, Gas↗