The elemental analysis results showed that substituting degree increased with the increase of amount of ethylene chlorohydrin which show linear relation .

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Relations between substituting degree brei viscosity and monomer concentration chloroacetic acid concentration reaction time and reaction temperature are concluded from experiment results and pH value change rules of conductivity of the reaction system are studied .

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This peper attempts to apply analysis method of grey theory in fuzzy synthetic evaluation model substituting grey connection coefficient form membership degree and based on system analysis .

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