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Optical micrographs of P4HB spherulites formed at the indicated non-isothermal crystallization times by cooling the sample at a rate of 0.5 °C/min from 45 °C, where some spherulites were isothermally grown (60 min) from the melt state. Micrographs were taken at temperatures of 44 °C (a), 38 °C (b), 36 °C (c), and 33 °C (d).
