Journal
POLYMER
Volume 202, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.122712
Keywords
Fast scanning calorimetry; Crystallization; Thermal history
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Funding
- Toray Research Center, Inc.
- Ministry of Education and Science of the Russian Federation [14.Y26.31.0019]
- Tokyo Tech World Research Hub Initiative (WRHI)
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Fast scanning calorimetry (FSC) measurements were carried out for multi-step, isothermal, crystallized poly (butylene terephthalate) to quantify the effect of single-step to triple-step annealing above Tg (40 degrees C interval below the previous annealing temperature) on the crystallization/melting kinetics. In the case of double-step annealing, two endothermic peaks were observed on the FSC curves due to the melting of the crystal formed during the 1st step (base crystal; BC) and 2nd step (thermal history crystal; THC). The crystallization rate of the THC decreased due to the spatial restriction of the pre-existing BC. The melting kinetics of the THC were not affected by the time of 1st step crystallization. If the sample was re-heated to the 1st step temperature (T-c1) after multiple annealing, the thermal history of the previous annealing was completely erased. Moreover, in the re-annealing process at T-c1, secondary crystallization showed the same behavior as that expected from the result of single-step annealing.
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