Article non-isothermal crystallization kinetics of poly(ethylene glycol)-poly(L-lactide) diblock copolymer and poly(ethylene glycol) homopolymer via fast-scan chip-calorimeter

Dejia Chen, Lisha Lei, Meishuai Zou, Xiaodong Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)- poly(L-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time t1/2. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and.

Original languageEnglish
Article number1156
JournalPolymers
Volume13
Issue number7
DOIs
Publication statusPublished - 1 Apr 2021

Keywords

  • Diblock copolymer
  • Double-crystallizable
  • Fast cooling rate
  • Fast-scan chip-calorimeter
  • Non-isothermal crystallization kinetics
  • Poly(ethylene glycol)- poly(L-lactide)

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