Thermal degradation studies of novel diethylene glycol based unsaturated polyesters in air

Thermal degradation of some unsaturated polyesters synthesized by ‘1-step’, ‘2-step’ and ‘3-step’ polyesterification processes and designated as NUP-I, NUP-II and NUP-III, respectively, have been studied using thermogravimetry (TG), derivative thermogravimetry (DTG), differential thermal analysis (D...

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Bibliographic Details
Published in:Polymer degradation and stability 1998, Vol.62 (1), p.9-14
Main Authors: Agrawal, J.P., Sarwade, D.B., Makashir, P.S., Mahajan, R.R., Dendage, P.S.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
Degradation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
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Summary:Thermal degradation of some unsaturated polyesters synthesized by ‘1-step’, ‘2-step’ and ‘3-step’ polyesterification processes and designated as NUP-I, NUP-II and NUP-III, respectively, have been studied using thermogravimetry (TG), derivative thermogravimetry (DTG), differential thermal analysis (DTA), iso-thermal TG, infrared (IR) spectroscopy and hot stage microscopy. The data from dynamic studies in static air and dynamic nitrogen suggest that the mode of degradation is different in air and nitrogen. The degradation in static air involves two stages as against single stage degradation in nitrogen. Isothermal studies in air reveal that the degradation follows a two-step first-order reaction. IR studies show that the degradation starts with the breaking of ester linkages and CO 2 is the initial gaseous product detected at 300 °C.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(97)00213-9