Linked polyurethane-acrylate (LPUA) emulsions with good stability were synthesized by seed swelling emulsion polymerization. We then investigated the thermal degradation process of the LPUA film by means of thermogravimetry-derivative thermogravimetry (TG-DTG) at different heating rates. It was shown that the heating rate had obvious influence on the thermal weight loss of LPUA. Both the starting and ending temperatures of decomposition shifted to a higher temperature with increased heating rate. The most probable kinetic parameters of decomposition were obtained from the Coats-Redfern integral equation and Achar differential equation. It was shown that the optimum mechanism functions of the decomposition reaction were 3D diffusion, spherical symmetry, D4, and deceleration type a–t curve. The thermal decomposition mechanism function of the LPUA film was f (α) = 3/2[(1−α)−1/3 − 1]−1; G (α) = (1 − 2α/3) − (1 − α)2/3.
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