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. 2023 Oct 11;24(11):4939–4957. doi: 10.1021/acs.biomac.3c00623

Table 3. Data Obtained from DSC Thermograms in the Second Heating Scana.

  Xc (%)
 T1m (°C)
 T2m (°C)
 Tc (°C)
    exposure time (d)
   exposure time (d)
   exposure time (d)
   exposure time (d)
sample initial 40 60 90 initial 40 60 90 initial 40 60 90 initial 40 60 90
extruded PHB 55.35 ± 2.61 50.91 66.50 72.40 169.6 ± 0.54 169.89 169.49 168.24 174.6 ± 0.21 174.52 173.26 173.93 74.55 ± 1.02 90.77 91.65 87.09
0.5L 51.18 ± 1.49 52.39 64.72 55.54 166.9 ± 1.43 164.77 164.06 161.75 168.7 ± 0.72 171.73 171.02 170.35 103.8 ± 2.03 93.24 90.73 86.18
0.5L/0.5MA 50.38 ± 2.71 62.46 59.22 61.39 162.9 ± 0.41 161.56 161.69 161.8 171.5 ± 0.17 171.11 170.73 171.17 83.83 ± 0.73 85.82 86.34 84.28
0.5L/1MA 53.55 ± 0.91 52.51 64.34 62.34 164.5 ± 0.95 160.52 160.15 160.14 172.0 ± 0.32 170.49 169.75 169.47 88.80 ± 0.79 86.51 85.85 83.11
0.5L/1.5MA 53.76 ± 0.79 52.55 53.36 62.07 161.1 ± 0.75 160.17 159.68 157.96 170.5 ± 0.94 170.46 170.13 168.71 63.48 ± 4.69 84.39 83.21 79.99
0.5L/2MA 53.00 ± 0.78 65.43 63.19 64.95 160.1 ± 0.93 157.75 155.91 155.32 169.6 ± 0.14 168.73 167.50 166.81 59.67 ± 1.86 79.89 74.47 69.77
1L 50.62 ± 4.30 49.13 61.31 62.23 160.5 ± 1.34 160.82 157.56 159.58 169.7 ± 0.33 167.73 166.53 167.41 93.99 ± 16.2 103.61 97.98 99.70
1L/0.5MA 47.77 ± 1.11 49.50 55.47 61.69 158.8 ± 0.36 158.51 156.97 157.23 168.9 ± 0.19 168.81 167.30 167.72 87.94 ± 1.17 87.42 86.76 84.23
1L/1MA 51.41 ± 0.92 50.25 59.28 62.77 157.7 ± 0.44 157.74 156.9 156.64 168.7 ± 0.12 169.11 168.62 167.71 66.76 ± 0.57 75.01 79.84 75.67
1L/1.5MA 49.16 ± 1.70 49.98 63.96 60.86 157.1 ± 0.23 157.92 155.92 155.44 168.5 ± 0.34 169.02 167.58 167.15 65.52 ± 2.80 77.48 72.3 74.31
1L/2MA 52.62 ± 2.43 48.64 61.37 64.99 158.8 ± 0.94 157.27 155.52 155.63 168.5 ± 0.36 168.49 167.24 166.79 58.45 ± 0.14 76.3 77.19 75.81
a

Degree of crystallinity, Xc; Melting point temperature, T1m for the chemically modified phase and T2m for PHB; Crystallization temperature, Tc, average ± standard deviation, n = 3. Standard deviation for the biodegradable samples is ca. 1.8% for Xc, 0.76 °C for T1m, 0.35 °C for T2m, and 2.91 °C for Tc.