Herbert B. Scher (Eds.)'s Controlled Release Pesticides PDF

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Sample text

TABLE IV CONTROLLED RELEASE MATERIALS Rubber Natural Synthetic Ethylene - Propylene Polymer C e l l u l o s i c Materials P o l y i s o b u t y l e n e - Butyl Rubber Styrene - Butadiene Copolymer P o l y a c r y l o n i t r i 1 es Polyacrylates Polyesters Polyamides Polyethylene Polyvinyl Chloride Chloroprene Polymer Polyurethanes Ci s Polybutadiene Acetal Copolymer Others: S i l i c o n Rubber Polyacrylamides Hydrin Rubber Microporous P l a s t i c Sheet A d i r e c t quotation by C a r d a r e l l i and Walker i n t h e i r f i n a l r e p o r t to the EPA on the Development of R e g i s t r a t i o n C r i t e r i a f o r CR P e s t i c i d e Formulations, sums up t h e i r views on the e n v i r o n mental impact from the use of CR p e s t i c i d e products : " I t should be recognized that the polymeric material must degrade i n some fashion before there can be any environmental impact i n the c h e m i c a l , biochemical or b i o l o g i c a l sense.

A more fundamental and comprehensive approach to the general problem of d i f f u s i o n i n multicomponent systems i s a f f o r d e d by the theory of i r r e v e r s i b l e thermodynamics. The r a t e of f l o w of a substance i n such a system i s dependent not o n l y on i t s own g r a d i e n t of chemical p o t e n t i a l ( i . e . , c o n c e n t r a t i o n g r a d i e n t ) but a l s o on the g r a d i e n t s of chemical p o t e n t i a l of the other components as w e l l as e x t e r n a l f o r c e g r a d i e n t s ( s t r e s s , e l e c t r i c f i e l d s , temperature, e t c .

Newly developed pesticides may never reach the market unless they can be stablized long enough to effect control through controlled-release formulations. Economic and environmental advantages might also be gained by the release of constant but lower concentrations of toxicants than may be possible with conventional type formulations. The technology of microencapsulation and other controlled release systems, as will be discussed during this Symposium, have been developed to the point of making controlled release pesticide formulations a r e a l i t y .

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