Non-isothermal Degradation Kinetics of Poly (2,2′-dihydroxybiphenyl)


Catalytic oxidative polymerization of 2,2′-dihydroxybiphenyl (DHBP) was performed by using Schiff base polymer-Cu (II) complex and hydrogen peroxide as catalyst and oxidant, respectively. According to size exclusion chromatography (SEC) analysis, the number-average molecular weight (M n), weight-average molecular weight (M w) and polydispersity index (PDI) values of poly (2,2′-dihydroxybiphenyl) (PDHBP) were found to be 37,500, 90,000 g mol−1 and 2.4, respectively. The thermal degradation kinetics was investigated by thermogravimetric analysis in dynamic nitrogen atmosphere at four different heating rates: 5, 10, 15 and 20 °C min−1. The derivative thermogravimetry curves of PDHBP showed that its thermal degradation process had one weight-loss step. The apparent activation energies of thermal decomposition for PDHBP as determined by Tang, Flynn-Wall-Ozawa (FWO), Kissenger-Akahira-Sunose (KAS), Coats-Redfern (CR) and Invariant kinetic parameter (IKP) methods were 109.1, 109.0, 110.0, 108.4 and 109.8 kJ mol−1, respectively. The mechanism function and pre-exponential factor were determined by master plots and Criado-Malek-Ortega method. The most likely decomposition process was a D n Deceleration type in terms of the CR, master plots and Criado-Malek-Ortega results.


Materials Science and Engineering

Keywords and Phrases

Physical Chemistry; Characterization and Evaluation of Materials; Soft Matter; Complex Fluids; Polymer Sciences; Poly (2; 2′-Dihydroxybiphenyl); Kinetic Parameter; Mechanism Function

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Article - Journal

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© 2009 Springer Verlag, All rights reserved.

Publication Date

01 Apr 2009