# The difference of equilibrium melting point between poly(

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In order to explore the origin of the higher melting point of poly(lactic acid) (PLA) stereocomplex crystal (SC) than that of homo‐crystal (HC), the equilibrium melting point (${T}_{\mathrm{m}}^{0}$) differential between SC and HC was determined using the Hoffman–Weeks method. The results showed that, for PLA samples with Mn around 16, 20 and 65 kg mol−1, the ${T}_{\mathrm{m}}^{0}$ differential between SC and HC is around 36, 42 and 55 °C, respectively. Thus, the higher melting point of SC compared to HC does not stem from ${T}_{\mathrm{m}}^{0}$ differential only. For PLA samples with lower Mn, the supercooling differential between poly(l‐lactic acid) (PLLA)/poly(d‐lactic acid) (PDLA) blends and PLLA is smaller than that with higher Mn, which means chain diffusion behavior is crucial for SC formation in PLLA/PDLA blends. The fact that the SC adopts the intermolecular parallel arrangement rather than the adjacent chain folding is verified by the greater slope of the melting point of SC versus crystallization temperature fitting curve when Mn is relative higher. © 2018 Society of Chemical Industry
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Document Type: Research Article

Publication date: February 1, 2019