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- W761289466 abstract "Literature values of the enthalpy of melting (Δhm°) of 100% crystalline poly(l-lactic acid) (PLLA) vary in a wide range (82–203 J g–1). In most cases, such values were determined without taking into account the presence of α′- or α-crystal modifications, or the influence of d-lactic acid units in the analyzed poly(lactic acid). The bulk enthalpy of melting was determined for the stable orthorhombic α form in only few studies, and thermodynamic properties of the metastable α′-modification are not available yet. In the present work, the temperature dependence of Δhm° for both the α′- and α-crystal polymorphs of PLLA are determined, by combining differential scanning calorimetry and X-ray diffraction. It is proven that the enthalpies of melting of α′- and α-crystals of 100% crystalline PLLA are different. At the respective melting temperatures of 150 °C and 180 °C, the Δhm° values of the α′- and α-forms are 107 and 143 J g−1. At identical temperature, the enthalpy of melting of α′-crystals is approximately 25 J g−1 lower than that of the α-form. This observation is rationalized taking into account the presence of conformational defects in the disordered α′-modification." @default.
- W761289466 created "2016-06-24" @default.
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- W761289466 date "2015-09-01" @default.
- W761289466 modified "2023-10-14" @default.
- W761289466 title "Enthalpy of melting of α′- and α-crystals of poly(l-lactic acid)" @default.
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- W761289466 doi "https://doi.org/10.1016/j.eurpolymj.2015.07.024" @default.
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