||Methods for assessing exposure to chemical substance. Volume II. : Methodology for estimating the migration of additives and impurities from polymeric materials /
Schwope, Arthur D. ;
Goydan, R. ;
Reid, R. C.
||Little (Arthur D.), Inc., Cambridge, MA. ;Massachusetts Inst. of Tech., Cambridge.;Environmental Protection Agency, Washington, DC. Office of Pollution, Prevention, and Toxics.
|| U.S. Environmental Protection Agency, Office of Pesticides and Toxic Substance,
Hazardous substances--Environmental aspects.
Environmental transport ;
Public health ;
Study estimates ;
Computerized simulation ;
Diffusion coefficient ;
Physicochemical properties ;
Mass transfer ;
Air pollution ;
Water pollution ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||190 pages : illustrations ; 28 cm
The report contains extensive documentation concerning the migration of additives from polymers to the environment. The additives and monomer residues can migrate from the plastic or elastomer over time. The rate and extent of migration is dependent on many factors such as temperature, the compatibility of the migrant with the polymer, the molecular size of the migrant, the compatibility of the migrant with the phase external to the polymer, and the interactions that may occur between the external phase and the polymer. The Exposure Evaluation Division (EED) of the Office of Pollution Prevention and Toxics is frequently required to assess the potential for exposure to chemicals that are used as additives in polymeric materials or are the monomers or low molecular weight oligomers contained in polymers. The task was undertaken with the objective of developing and documenting a defensible approach to assess the potential for release of chemical additives and reaction residues from polymeric materials. A family of mathematical models was developed and/or adapted for describing the migration of additives to gases, liquids and solids in contact with polymeric materials. In all cases, the user must specify the physical situation.
"September 1992." "Volume II of nine volumes." "Thomas Murray, project officer." Microfiche.