Visualization of Inter- and Intramolecular Interactions in Poly(3-hydroxybutyrate)/Poly(L -lactic acid) (PHB/PLLA) Blends During Isothermal Melt Crystallization Using Attenuated Total Reflection Fourier Transform infrared (ATR FT-IR) Spectroscopic Imaging
| Autor: | Huiqiang Lu, Harumi Sato, Sergei G. Kazarian |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Infrared Special Issue: Honoring Yukio Ozaki poly(3-hydroxybutyrate) 02 engineering and technology ATR FT-IR spectroscopic imaging 01 natural sciences Isothermal process law.invention symbols.namesake biopolymer blend law image Crystallization Fourier transform infrared spectroscopy Instrumentation poly(L-lactide) Spectroscopy chemistry.chemical_classification 010401 analytical chemistry technology industry and agriculture Attenuated total reflection Fourier transform infrared Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Fourier transform Chemical engineering chemistry Intramolecular force Attenuated total reflection FT-IR spectroscopy symbols phase separation 0210 nano-technology |
| Zdroj: | Applied Spectroscopy |
| ISSN: | 1943-3530 0003-7028 |
| Popis: | Inter- and intramolecular interactions in multicomponent polymer systems influence their physical and chemical properties significantly and thus have implications on their synthesis and processing. In the present study, chemical images were obtained by plotting the peak position of a spectral band from the data sets generated using in situ attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopic imaging. This approach was successfully used to visualize changes in intra- and intermolecular interactions in poly(3-hydroxybutyrate)/poly(L-lactic acid) (PHB/PLLA) blends during the isothermal melt crystallization. The peak position of ν(C＝O) band, which reflects the nature of the intermolecular interaction, shows that the intermolecular interactions between PHB and PLLA in the miscible state (1733 cm−1) changes to the inter- and intramolecular interaction (CH3⋯O=C, 1720 cm−1) within PHB crystal during the isothermal melt crystallization. Compared with spectroscopic images obtained by plotting the distribution of absorbance of spectral bands, which reveals the spatial distribution of blend components, the approach of plotting the peak position of a spectral band reflects the spatial distribution of different intra- and intermolecular interactions. With the process of isothermal melt-crystallization, the disappearance of the intermolecular interaction between PHB and PLLA and the appearance of the inter- and intramolecular interactions within the PHB crystal were both visualized through the images based on the observation of the band position. This work shows the potential of using in-situ ATR FT-IR spectroscopic imaging to visualize different types of inter- or intramolecular interactions between polymer molecules or between polymer and other additives in various types of multicomponent polymer systems. Graphical Abstract |
| Databáze: | OpenAIRE |
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