In this work, the effects of annealing at Ta above and below the Tg of amorphous quenched poly(L-lactide) were investigated by the combination of time resolved FTIR (TR-FTIR) and conventional (DSC) and flash DSC (FSC). At TaTg, TR-FTIR directly evidenced an increase of gt conformer concentration as precursor of 103 helix formation and crystallization. On the other hand, DSC and FSC highlighted the effects of annealing during a subsequent scan. Overall results let hypothesize a further step into the hierarchical pathway of PLLA crystallization mechanism, in which the liquid organizes conformationally before its struc-turing into the crystalline phase.
Conformational transition of PLLA prior to cold crystallization / Rocchi, LORENZO AUGUSTO; Di Lisio, Valerio; Martinelli, Andrea. - (2022). (Intervento presentato al convegno XXIV convegno nazionale associazione italiana macromolecole (AIM) tenutosi a Trento; Italy;).
Conformational transition of PLLA prior to cold crystallization
Lorenzo Augusto Rocchi
Primo
;Andrea MartinelliUltimo
2022
Abstract
In this work, the effects of annealing at Ta above and below the Tg of amorphous quenched poly(L-lactide) were investigated by the combination of time resolved FTIR (TR-FTIR) and conventional (DSC) and flash DSC (FSC). At TaTg, TR-FTIR directly evidenced an increase of gt conformer concentration as precursor of 103 helix formation and crystallization. On the other hand, DSC and FSC highlighted the effects of annealing during a subsequent scan. Overall results let hypothesize a further step into the hierarchical pathway of PLLA crystallization mechanism, in which the liquid organizes conformationally before its struc-turing into the crystalline phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
