Preparation and evaluation of polyurethane foam/rubber membrane-based samplers for use in isocyanate sampling.
Rudzinski-WE; Yin-J; Anderson-T; Norman-S; Unnikrishnan-G; Varkey-JT; George-SC; Thomas-S; Aminabhavi-TM
Polym-plast Technol Eng 1998 Jan; 37(1):103-113
In order to collect isocyanate in both aerosol and vapor forms, we have developed a dual-membrane sampler which features a moist porous bed, backed up by an impermeable membrane. A polyester-polyurethane foam (PUF) was selected to function as the porous bed, and it was evaluated for its ability to resist solvent degradation and swelling while permitting rapid air penetration. Natural rubber (NR) and styrene-butadience rubber (SBR) membranes were prepared to serve as backup membranes. These were also evaluated for their solvent compatibitility and air-penetration characteristics. A polyester-polyurethane foam backed up by a NR membrane prepared by an efficient vulcanization procedure was selected as the best combination for development of the isocyanate sampler. Recovery studies using the hexamethylene-based polyisocyanate, biuret, indicated better than 80% recovery of polyisocyanate after application to the PUF.
Occupational-exposure; Sampling; Sampling-methods; Solvents; Analytical-methods; Isocyanates; Polyurethane-foams; Vapors; Aerosols; Styrenes; Air-sampling; Sampling-equipment
100-42-5; 822-06-0; 108-19-0
Research Tools and Approaches: Exposure Assessment Methods
Polymer-Plastics Technology and Engineering
Southwest Texas State University, Department of Chemistry, San Marcos, Texas