Melting of Conformationally Disordered Crystals (a'-Phase) of Poly(L-lactic acid) (Articolo in rivista)

Type
Label
  • Melting of Conformationally Disordered Crystals (a'-Phase) of Poly(L-lactic acid) (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/macp.201400126 (literal)
Alternative label
  • René Androsch , Christoph Schick , Maria Laura Di Lorenzo (2014)
    Melting of Conformationally Disordered Crystals (a'-Phase) of Poly(L-lactic acid)
    in Macromolecular chemistry and physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • René Androsch , Christoph Schick , Maria Laura Di Lorenzo (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • R. Androsch, Martin-Luther-University Halle-Wittenberg , Center of Engineering Sciences D-06099 , Halle/Saale , Germany. C. Schick, University of Rostock , Institute of Physics, Wismarsche Str. 43-45, 18051 Rostock , Germany. M. L. Di Lorenzo, Consiglio Nazionale delle Ricerche, Istituto per i Polimeri, Compositi e Biomateriali - c/o Comprensorio Olivetti - Via Campi Flegrei, 34 - 80078 , Pozzuoli , (NA), Italy (literal)
Titolo
  • Melting of Conformationally Disordered Crystals (a'-Phase) of Poly(L-lactic acid) (literal)
Abstract
  • Melting and reorganization of conformationally disordered crystals (??-phase) of poly( L -lactic acid) (PLLA) are analyzed as a function of the rate of heating in a wide range between about 10 -1 and 10 3 K s -1 . It is found for the fi rst time that the reorganization of conformationally disordered ??-crystals into stable ?-crystals can be suppressed by fast heating. Heating of ??-crystals of PLLA at a constant rate, faster than 30 K s -1 , leads to its complete melting between 150 and 160 °C and suppression of formation of ?-crystals on continuation of heating. Non-isothermal reorganization of ??-crystals into ?-crystals only occurs when heating at a rate slower than 30 K s -1 . It is evidenced that isothermal reorganization of ??-crystals into ?-crystals at 150-160 °C proceeds via melting followed by recrystallization rather than a solid-solid phase transition. (literal)
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