under a Leica DM2500 polarizing optical microscopy equipped
with a camera. The temperature was programmed as follows:
heating from 20 ◦C to 110 ◦C with a heating rate of 20 ◦C min-1,
holding for 5 min at 110 ◦C, then cooling down to 20 ◦C with a
cooling rate of 20 ◦C/min.
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