The thermal transformation of an aromatic poly (amide), poly (ortho-oxyamide) and poly (benzoxazole) |
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| Authors: | K A Voloshchuk I Popovic S V Martinov A I Donskikh G M Tseitlin J Velickovic |
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| Institution: | (1) Polymer department, Moscow mendeleev institute of chemical technology, Miusskaja square 9, 125190 Moscow, Russia;(2) Faculty of technology and metallurgy, University of beograd, Karnegieva 4, YU-11000 Beograd, P.O.B. 494, Yugoslavia |
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| Abstract: | The thermal behaviour of three aromatic polymers, poly(3,3-dioxy-4,4-diphenylmethane) (POA), poly(2,2-m-phenylene-5,5-dibenzoxazolemethane) (PBO) and a commercial poly-(phenyleneisophthalamide) (Phenylon) was studied by thermal analysis, i.e. DSC and TG. PBO was formed by the progressive thermocyclization of POA. By transforming POA into PBO the thermal stability was increased proportionally to the degree of cyclization, due to the stiffening of the polymer chain. PBO was found to be more thermally stable than Phenylon. The activation energies of the desorption of moisture, cyclization and thermal degradation of the polymers in both nitrogen and air were determined from non-isothermal TG data. |
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| Keywords: | aromatic polymers DSC-TG kinetics thermal degradation mechanism thermal transformation |
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