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The compounds most generally used for that purpose are divalent transition-metal salts of higher aliphatic acids, such as stearic acid or dithiocarbonates or acetoacetic acid. The photochemical reaction is an oxidation-reduction reaction that forms free radicals capable of reacting with polyethylene, RH, to initiate an autooxidation chain reaction, as follows: M +2 (X) n — M + 1 (X) n _, + X- X- + R-H -» XH + RRH R- + 0 2 -» ROO- > ROOH + R• RO- + -OH and so on. 7 Blends of Biodegradable and Non-degradable Polymers The blending of biodegradable polymers, such as starch, with inert polymers, such as polyethylene, has received a considerable amount of attention for possible application in the waste disposal of plastics.
Therefore, the successful development of such devices requires the selection of bonds that are capable of undergoing rapid hydrolysis. 4 are slow to hydrolyze but which hydrolyze at increasingly rapid rates as the pH is lowered. Polymers based on both of these linkages are under intensive development and this chapter will cover, in depth, the development and current status of poly (ortho esters). 3 Ortho Ester Hydrolysis Mechanism The hydrolysis of acetáis, ketals and ortho esters proceeds as is illustrated in Scheme 2 for ortho esters .
Therefore, in order to prevent autoacceleration of the hydrolysis, a base must be incorporated into the polymer to neutralize the y-hydroxybutyric acid. The metabolic fate of the degradation products from a polymer prepared from diethoxy tetrahydrofuran and ds/irans-cyclohexanedimethanol has been -OXI-R- Ö H9O O ]l + HO-R-OH HOCH2CH2CH2COOH Scheme 4 48 J. Heller studied. 4% remained in the carcass . 1 4 Ccarboxyl-labelled y-hydroxybutyrate and y-butyrolactone were found to be metabolized very rapidly to 1 4 C 0 2 in the intact rat and the major pathway of metabolism does not appear to involve formation of succinic acid .
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