Using aluminium triflate as a co-catalyst for the polymerization of o-phenylenediamine and its derivatives
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Date
Authors
Amer, Ismael
Young, Desmond A.
Vosloo, Hermanus C.M.
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Publisher
Wiley
Abstract
Aromatic diamine monomers, including o-phenylenediamine (oPD), 4-methyl-o-phenylenediamine (4Me-oPD), 4,5-dimethylo-
phenylenediamine (dMe-oPD) and 4-(tert-butyl)-o-phenylenediamine (tBu-oPD), were polymerized by chemical oxidation
using ammonium persulfate as an oxidant. Aluminium triflate (Al(OTf)3) was also used for the first time as a co-catalyst
under various reaction conditions for the polymerization of oPD derivatives. The polymerization yield was improved when
Al(OTf)3 wasintroduced to thepolymerization reaction for mostpolymers. The solubilityofpoly(4-methyl-o-phenylenediamine)
(P(4Me-oPD)), poly(4,5-dimethyl-o-phenylenediamine) (P(dMe-oPD)) andpoly(4-(tert-butyl)-o-phenylenediamine) (P(tBu-oPD))
polymers was improved compared with the poly(o-phenylenediamine) (P(oPD)) polymers in most common solvents. The
homopolymers obtained were characterized by Fourier transform IR spectroscopy, UV−visible spectroscopy, 1H and 13C NMR,
wide-angle X-ray diffraction, DSC and TGA. The results showed that the yield, solubility and structure of the polymers are
significantly dependent on the polymerization conditions. DSC measurements indicated that the polymers exhibited melting
and crystallization transitions. The polymers also showed good thermal stability and decompose above 400 ◦C in nitrogen.
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Citation
Amer, I. et al. 2014. Using aluminium triflate as a co-catalyst for the polymerization of o-phenylenediamine and its derivatives. Polymer international, 63(7):1229-1237. [https://doi.org/10.1002/pi.4628]