Preparation of Polymer Electrolytes Derived from Polyurethaneamine

Abstract

Polyurethaneamine (PUA) was prepared from N-methyldiethanolamine and hexamethylenediiso-cyanate. A variety of quaternary ammonium salts of PUA (cationic polymer) were prepared from PUA and alkyl bromides of various chain length (C2C12) with a view of obtaining good flocculants. In alkylating PUA with alkyl bromides, it was found that alkylation occured to urethane-N as well as quaternization reaction, and using low molecule of urethane as model compound prepared from ethanol and hexamethylenediisocyanate, alkylation to urethane-N was ascertained by the reaction of urethane and dodecyl bromide. The flocculation ability for aqueous suspension of kaoline was investigated in the relation to the structure of cationic polymers by measuring the sedimentation velocity, sedimentation volume, and turbidity. Cationic polymer obtained from PUA and the higher alkyl bromide showed good flocculation effect. The suitable range of degree of quaternization was 4060%. Cationic polymer was most effective for flocculation with increase of acidity. The most clarity of supernatant gave 40ppm turbidity at the dosage of 50ppm using cationic polymer (degree of quaternization 84.4%) obtained from PUA and dodecyl bromide. Interraction (metachromasia) between methyl orange and cationic site of a number of cationic polymers were examined, and cationic polymers with the higher degree of quaternization derived from the higher alkyl bromides and PUA were shown large metachro-masia. Cationic polymers derived from the higher alkyl bromides showed good flocculating ability which are not inferior that of typical commercial products.