Key Laboratory of Advanced Materials(Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
Jun Xu (徐军), E-mail:jun-xu@mail.tsinghua.edu.cn
收稿:2017-04-10,
修回:2017-05-07,
录用:2017-05-17,
纸质出版:2017-12-05
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Study on Melting and Recrystallization of Poly(butylene succinate) Lamellar Crystals
Zhi-yu Lv, Michael C. Zhang, Yang Zhang, et al. Study on Melting and Recrystallization of Poly(butylene succinate) Lamellar Crystals
Study on Melting and Recrystallization of Poly(butylene succinate) Lamellar Crystals
Zhi-yu Lv, Michael C. Zhang, Yang Zhang, et al. Study on Melting and Recrystallization of Poly(butylene succinate) Lamellar Crystals
Differential scanning calorimetry (DSC) has been widely applied to study crystallization and melting of materials. However
for polymeric lamellar crystals
the melting thermogram during heating process usually exhibits a broad endothermic peak or even multiple endotherms
which may result from changes of metastability
via
recrystallization process. Sometimes
the recrystallization exotherm cannot be observed due to its overlapping with the melting endotherm. In this work
we employed a step heating procedure consisting of successive heating and temperature holding stages to measure the metastability of isothermally crystallized poly(butylene succinate) (PBS) crystals. With this approach we could gain the fraction of crystals melted at different temperature ranges and quantitatively detect the melting-recrystallization behavior. The melting-recrystallization behavior depends on the polymer chain structure and the crystallization temperature. For instance
PBS block copolymer hardly shows recrystallization behavior while PBS oligomer and high molecular weight PBS homopolymer demonstrate remarkable melting-recrystallization phenomenon. High molecular weight PBS isothermally crystallized in the low temperature range shows multiple melting-recrystallization while those isothermally crystallized at elevated temperatures do not exhibit observable recrystallization behavior. Furthermore
the melting endotherms were fitted
via
the melting kinetics equations. The original isothermally crystallized lamellae demonstrate quite different melting kinetics from the recrystallized lamellar crystals that melt at the highest temperature range
which is attributed to the different degrees of stabilization. Finally
the mechanism of melting-recrystallization is briefly discussed. We propose that apparent melt-recrystallization phenomenon be observed when melting of preformed lamellar crystals and recrystallization of thicker lamellae have similar free energy barrier.
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