Citation: . EFFECT OF RADIATION ON HIGH-CHARGE-DENSITY POLYDIALLY-DIMETHYL AMMONIUM CHLORIDE IN DILUTE AQUEOUS SOLUTION[J]. Chinese Journal of Polymer Science, ;2003, 21(4): 459-464. shu

EFFECT OF RADIATION ON HIGH-CHARGE-DENSITY POLYDIALLY-DIMETHYL AMMONIUM CHLORIDE IN DILUTE AQUEOUS SOLUTION

Received Date: 6 September 2002
Revised Date: 23 November 2002

The effect of radiation on high-charge-density cationic polymer, polydiallyl-dimethyl ammonium chloride (poly-DADMAC), in dilute aqueous solution was investigated. The irradiated samples were characterized in terms of reducedviscosity and electric conductivity. The crosslinking reaction of polyDADMAC chains occurs preferentially in the irradiatedsamples at a concentration of polyDADMAC higher than 1.3 g/100 mL that was induced indirectly by the OH radicals, oneof the radiolysis products of water. In more dilute samples(less than 0.8g/100 mL) the chain scission of macro radicals appears to be the main reaction.N2O atmosphere enhances the crosslinking due to the extra OH radicals produced by reaction between N2O and eaq-,another radiolysis products of water.Methanol and some mineral salts such as KCl,KBr inhibit the crosslinking to a certain extent.The mechanism of sensitization and inhibition is discussed in detail.
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