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Synthesis, characterization, and thermal degradation kinetic of polystyrene-g-polycaprolactone



In the present study, it has been demonstrated that polystyrene-g-polycaprolactone (PS-g-PCL) was successfully prepared by “click chemistry.” For this purpose, first, poly(styrene-co-4-chloromethylstyrene) (P(S-co-CMS)) with 4-chloromethylstyrene content (10%) was synthesized. Second, alkyne-functionalized polycaprolactone (PCL) was obtained using propargyl alcohol and caprolactone. P(S-co-CMS) and PCL were reacted in N,N-dimethylformamide for 24 h at 25°C to give PS-g-PCL. The synthesized polymer was characterized by nuclear magnetic resonance (1H-NMR), gel permeation chromatography, Fourier transform infrared spectroscopy and thermogravimetric analysis. The apparent activation energies for thermal degradation of PS-g-PCL were obtained by differential (Kissenger) and integral methods (Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose, Tang, Coats–Redfern, Van Krevelen et al.). The decomposition mechanism and pre-exponential factor were calculated in terms of Coats–Redfern method. The most likely decomposition processes of first and second degradation stages were An type and F3 type, respectively. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012