a The temperature program was initial temperature at 70 °C, increased by 10 °C/min to 170 °C, increased by 2 °C/min to 200 °C, increased by 5 °C/min to 220 °C and held for 16 min, increased by 5 °C/min to 235 °C and held for 7 min, and finally, increased by 5 °C/min to 280 °C.
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