《Table 3 Melting temperatures (Tm) , melting enthalpy (ΔHm) , degree of crystallinity (χc) , calcula

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《"Isothermal Crystallization Kinetics and Crystalline Morphologies of Poly(butylene adipate-co-butylene 1,4-cyclohexanedicarboxylate) Copolymers"》

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Figure 4 shows the second heating scans of DSC analysis after isothermal crystallization at different Tcs for PBC and PBAC-80 copolymer（for other PBAC copolymers，see Fig.S3，in ESI）.Obviously，all samples show double melting peaks and all peaks shift to higher temperature under higher Tc.The values of these peaks are summarized in Table 3.The double melting behaviors are quite common for semicrystalline polymers.The lower endothermal peak（Tm1）is generally associated with the melting of poor crystals which grow at Tc between large crystals，while the higher endothermal peak（Tm2）can be ascribed to the fusion of crystals actually formed at Tc during the primary crystallization.This result is a little similar to the report by Celli et al[40].However，a third peak that usually results from melting，recrystallization and remelting mechanism is not observed for all samples in the current study.The Tm1 of PBAC copolymers tends to separate from Tm2 with more amount of BA unit at lower Tc，indicating that the presence of BA unit would result in more amount of imperfect crystals under low Tc.It is worth noting that all Tm1 is approximately7°C higher than the corresponding Tc.Subsequently，Tm2 is used for the Hoffman-Weeks equation to estimate the Tm0values for PBC and PBAC copolymers.