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|Title:||Chlorine substitution in poly(arylamine)s during synthesis and protonation in hydrochloric acid|
|Authors:||Neoh, K.G. |
|Source:||Neoh, K.G.,Kang, E.T.,Tan, K.L. (1993). Chlorine substitution in poly(arylamine)s during synthesis and protonation in hydrochloric acid. Polymer Degradation and Stability 40 (3) : 357-363. ScholarBank@NUS Repository.|
|Abstract:||The effects of varying the oxidant monomer ratio in the polymerization of aniline, N-phenyl-p-phenylenediamine and N,N′-diphenylbenzidine in a hydrochloric acid solution of (NH4)2S2O8 were investigated. With the first two monomers, increasing the oxidant monomer ratio from 0·3 to 3 results in a substantial increase in polymer yield but the extent of covalent bond formation between chlorine and the polymer is also increased. In addition, differences in the N C and imine amine ratios, and in thermal stability, are evident in the polymers synthesized at different oxidant monomer ratios. The degree of polymerization of N,N′-diphenylbenzidine is low and it exhibits a very high susceptibility to chlorine substitution in the reaction mixture. A comparison of the extent of chlorine substitution is made among polymers synthesized in (NH4)2S2O8 HCl, and polyaniline base and aromatic amine monomers treated with HCl of the same concentration. © 1993.|
|Source Title:||Polymer Degradation and Stability|
|Appears in Collections:||Staff Publications|
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