Back to Search
Start Over
Melting of alpha'- and alpha-crystals of poly(lactic acid)
- Source :
- AIP conference proceedings 1736 (2016). doi:10.1063/1.4949583, info:cnr-pdr/source/autori:Di Lorenzo, Maria Laura; Androsch, René/titolo:Melting of alpha'-and alpha-crystals of poly(lactic acid)/doi:10.1063%2F1.4949583/rivista:AIP conference proceedings/anno:2016/pagina_da:/pagina_a:/intervallo_pagine:/volume:1736
- Publication Year :
- 2016
- Publisher :
- American Institute of Physics, New York , Stati Uniti d'America, 2016.
-
Abstract
- The influence of chain structure on thermal stability of ?'-crystals of poly(lactic acid) (PLA) with high L-lactic acid content (96-100 %) is detailed in this contribution. ?'-crystals of PLA grow at temperatures below 120 °C, and spontaneously transform into stable ?-modification during heating. Using conventional differential scanning calorimetry (DSC) and fast scanning chip calorimetry (FSC), a wide range of scanning rates, between about 10-1 and 102 K s-1 could be tested. It was found that reorganization of disordered ?'-crystals into stable ?-crystals can be suppressed by fast heating. The critical heating rate needed to completely melt ?'-crystals and to avoid formation of ?-crystals on continuation of heating varies with the chain composition, and decreases upon increase of the D-lactic acid content in the PLA chain.
- Subjects :
- Enthalpy
Poly(lactic acid)
Melting
Calorimetry
Crystal polymorphism
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- AIP conference proceedings 1736 (2016). doi:10.1063/1.4949583, info:cnr-pdr/source/autori:Di Lorenzo, Maria Laura; Androsch, René/titolo:Melting of alpha'-and alpha-crystals of poly(lactic acid)/doi:10.1063%2F1.4949583/rivista:AIP conference proceedings/anno:2016/pagina_da:/pagina_a:/intervallo_pagine:/volume:1736
- Accession number :
- edsair.cnr...........992c1fef9ea415a0dce3925b34aca625
- Full Text :
- https://doi.org/10.1063/1.4949583