. 2018 Jan 18;10(1):90. doi: 10.3390/polym10010090

Table 1.

Thermal properties of the three polyester films before and after degradation for different times.

Time (h)	PES			PBS			PHS
Time (h)	T_m (°C)	∆H_m (J/g)	X_c (%)	T_m (°C)	∆H_m (J/g)	X_c (%)	T_m (°C)	∆H_m (J/g)	X_c (%)
0	102.1 ± 0.8	49.2 ± 1.1	64.0 ± 1.4	105.1 ± 0.7	53.1 ± 1.5	48.2 ± 1.4	52.2 ± 0.8	57.0 ± 1.2	42.1 ± 0.9
2	101.9 ± 0.6	47.1 ± 1.2	62.1 ± 1.6	105.1 ± 0.8	51.9 ± 1.2	47.0 ± 1.1	52.0 ± 0.6	55.0 ± 1.6	40.8 ± 1.2
6	101.7 ± 0.6	45.8 ± 1.0	59.8 ± 1.3	105.0 ± 0.6	50.2 ± 1.7	45.9 ± 1.5	51.1 ± 0.6	54.2 ± 1.3	40.0 ± 1.0
8	101.0 ± 0.5	45.1 ± 1.2	59.2 ± 1.6	104.2 ± 0.4	46.8 ± 1.1	42.3 ± 1.0	51.1 ± 0.3	51.4 ± 2.2	38.1 ± 1.6
10	101.0 ± 0.5	42.8 ± 0.9	56.6 ± 1.2	104.1 ± 0.4	44.1 ± 1.5	39.8 ± 1.4	49.8 ± 0.3	50.0 ± 1.1	36.9 ± 0. 8

Time: referred to the degradation time of polyesters; T_m: melting temperature; ∆H_m: enthalpy of fusion. $X_{C} (%) = \frac{Δ H_{m}}{Δ H_{m}^{0}} \times 100 %$ , $Δ H_{m}^{0} = 76.4$ , 110, and 135 J/g for PES, PBS, and PHS, respectively [37].