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- W4221105382 abstract "Abstract The bulk enthalpy of melting of α ‐crystals of poly (L‐lactic acid) (PLLA) is evaluated by fast scanning calorimetry (FSC), by correlating the melting enthalpy of samples of different crystallinity with the corresponding heat capacity at 90 °C, that is at a temperature higher than the glass transition temperature of the bulk amorphous phase and lower than the melting temperature. Extrapolation of this relationship for crystals formed at 140 °C towards the heat capacity of fully solid PLLA yields a value of 104.5±6 J g −1 when melting occurs at 180–200 °C. The analysis relies on a two‐phase structure, that is, absence of a vitrified rigid amorphous fraction (RAF) at the temperature of analysis the solid fraction (90 °C). Formation and vitrification of an RAF are suppressed by avoiding continuation of primary crystallization and secondary crystallization during cooling the system from the crystallization temperature of 140 °C to 90 °C, making use of the high cooling capacity of FSC. Small‐angle X‐ray scattering (SAXS) confirmed thickening of initially grown lamellae which only is possible if these lamellae are not surrounded by a glassy RAF. Linear crystallinity values obtained by SAXS and calorimetrically determined enthalpy‐based crystallinities agree close to each other." @default.
- W4221105382 created "2022-04-03" @default.
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- W4221105382 date "2022-04-11" @default.
- W4221105382 modified "2023-09-29" @default.
- W4221105382 title "Bulk Enthalpy of Melting of Poly (<scp>l</scp>‐lactic acid) (PLLA) Determined by Fast Scanning Chip Calorimetry" @default.
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- W4221105382 doi "https://doi.org/10.1002/marc.202200148" @default.
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