Thermal behavior of poly(lactic acid)-nanocomposite studied by near-infrared imaging based on roundtrip temperature scan

Hideyuki Shinzawa, Masakazu Nishida, Akira Tsuge, Daitaro Ishikawa, Yukihiro Ozaki, Shigeaki Morita, Wataru Kanematsu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The thermal behavior of poly(lactic acid) (PLA) was studied by nearinfrared imaging to provide a molecular-level understanding of the physical improvement caused by nanoclay dispersion. A set of PLA samples, each having different nanoclay dispersion, was prepared under varying sonication time. Crystallinity variation of the polymer interacting with the nanoclay particles was analyzed by a roundtrip temperature scan below the melting temperature. Namely, the samples underwent heating and then cooling in the opposite way during the spectral measurement. The discrepancy of the spectral feature between the heating and the cooling indicated the development of the hysteresis associated with the cold crystallization of the PLA lamellae. The generation of the spectral residuals revealed the inner working mechanism of how the polymer structure undergoes variation depending on the presence of the clay particles and their dispersions. The sonication brings substantial dispersion of the nanoclay over the polymer matrix. The nanoclay particles then induce the additional development of the crystalline structure due to the molecular interaction between the PLA and nanoclay arising from the presence of enormous surface area, which in turn induces variation of mechanical strength to the polymer.

Original languageEnglish
Pages (from-to)371-378
Number of pages8
JournalApplied spectroscopy
Volume68
Issue number3
DOIs
Publication statusPublished - 2014 Mar 1

Keywords

  • NIR
  • NIR imaging
  • Nanocomposite
  • Near-Infrared spectroscopy
  • PLA
  • Poly(lactic acid)
  • Sonication

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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