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. 2020 Dec 8;10(71):43566–43578. doi: 10.1039/d0ra07635j

Summary of Tp, T50%, and Ea values from the DSC dynamic methods of Kissinger; Flynn–Wall; and Ozawa for l-lactide ROP using various initiators/initiating systems at heating rates of: 5, 10, 15, and 20 °C min−1.

Initiators/initiating systems Heating rate, β (°C min−1) T p (°C) T 50% (°C) E a (kJ mol−1)
Kissingera Flynn–Wallb Ozawac
Sn(Oct)2 5 142.0 141.8 57 65 61
10 157.8 157.0
15 167.3 166.0
20 176.0 173.0
Liquid Sn(OnC4H9)2 5 128.9 131.1 52 59 56
10 145.3 147.2
15 150.8 152.5
20 160.3 161.7
Sn(Oct)2/nC4H9OH 5 139.2 138.8 60 67 64
10 152.3 151.7
15 161.5 160.3
20 170.0 169.0
Liquid Sn(OnC6H13)2 5 144.8 144.2 57 60 61
10 157.5 157.1
15 170.0 167.3
20 177.0 174.3
Sn(Oct)2/nC6H13OH 5 148.8 148.5 61 67 66
10 160.0 159.0
15 174.3 173.3
20 179.3 178.0
Liquid Sn(OnC8H17)2 5 152.3 152.8 65 71 69
10 168.5 167.3
15 175.5 175.8
20 185.3 184.0
Sn(Oct)2/nC8H17OH 5 160.3 158.3 71 74 72
10 169.3 168.0
15 177.5 176.5
20 187.0 186.7
a

Kissinger: d[ln (β/Tp2)]/d(1/Tp) = −Ea/R = slope.

b

Flynn–Wall: log g(α) = log (Af(cat)Ea/R) − log β − 2.315 − 0.457 (Ea/RT50%), slope = −0.457 (Ea/R).

c

Ozawa: log β = constant − 0.4567 (Ea/RTp), slope = −0.4567 (Ea/R).