Real-Time Monitoring of Structural Changes in Poly(lactic acid) during Thermal Treatment by High-Speed Terahertz Time-Domain Spectroscopy for Nondestructive Inspection

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Thermally induced structural changes in polymeric materials are usually accompanied by a change of vital properties such as mechanical stability. We demonstrate an emerging technique for real-time monitoring of thermally induced structural changes of poly(lactic acid) (PLA). The technique is based on terahertz time-domain spectroscopy (THz-TDS) because spectra of the dielectric function of PLA in the terahertz frequency range reflect macroscopic molecular vibration modes which are strongly linked to the PLA morphology and structure. By comparison with conventional X-ray diffraction data, we confirm a strong correlation between the polymer structure and the spectra of the dielectric function. We achieve real-time monitoring of two essential thermally induced structural changes: the cold crystallization process from amorphous phase to the crystalline α-phase and the glass transition process. The proposed technique is useful for understanding the structural changes in polymeric materials induced by thermal treatments and holds promise for nondestructive inspection of polymeric products in a contactless manner.

Original languageEnglish
Pages (from-to)3008-3016
Number of pages9
JournalACS Applied Polymer Materials
Volume1
Issue number11
DOIs
Publication statusPublished - 2019 Nov 8

Keywords

  • cold crystallization
  • dielectric function
  • glass transition
  • poly(lactic) acid
  • real-time monitoring
  • terahertz spectroscopy
  • thermal treatment

ASJC Scopus subject areas

  • Polymers and Plastics
  • Process Chemistry and Technology
  • Organic Chemistry

Fingerprint

Dive into the research topics of 'Real-Time Monitoring of Structural Changes in Poly(lactic acid) during Thermal Treatment by High-Speed Terahertz Time-Domain Spectroscopy for Nondestructive Inspection'. Together they form a unique fingerprint.

Cite this