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- Title
Equilibrium Melting Temperature of Polymorphic Poly(L-lactide) and Its Supercooling Dependence on Growth Kinetics.
- Authors
Ri-Chao Zhang; Dan Sun; Ai Lu; Meiling Zhong; Guangyao Xiong; Yizao Wan
- Abstract
In this study, the isothermal crystallization process of poly(L-lactide) (PLLA) has been investigated using in situ XRD, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). Linear and nonlinear extrapolation methods have been deployed to estimate the equilibrium melting temperature (T0m), which is used for analyzing the supercooling dependence of the PLLA spherulitic growth rate (G). A double-melting behavior observed for PLLA under crystallization Tc < 120 °C has been attributed to the formation of both α' and α crystals. The T0m values of both α' and α crystals have been evaluated using the linear method (172.8 °C) and nonlinear method (196.4 °C), with the nonlinear estimate being 23.6 °C higher. A discontinuity in the temperature dependence of spherulite growth rate is observed around 128.3 °C. Regime II-III transition is found to occur at 128.3 °C when T0m = 196.4 °C as estimated by the nonlinear extrapolation method.
- Subjects
CRYSTALLIZATION; EXTRAPOLATION; DIFFERENTIAL scanning calorimetry; MICROSCOPY; SPHERULITES (Polymers)
- Publication
Polymers (20734360), 2017, Vol 9, Issue 11, p625
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym9110625