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  • 1 National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5 Tsukuba, Ibaraki 305-8565 Japan Tsukuba Central 5 Tsukuba, Ibaraki 305-8565 Japan
  • | 2 Otsuma Women's University 12 Sanban-cho Chiyoda-ku, Tokyo 102-8357 Japan 12 Sanban-cho Chiyoda-ku, Tokyo 102-8357 Japan
  • | 3 Fukui University of Technology 3-6-1 Gakuen Fukui-City, Fukui 910-8505 Japan 3-6-1 Gakuen Fukui-City, Fukui 910-8505 Japan
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Abstract  

Thermal degradation behaviour of alcoholysis lignin-based polycaprolactones (ALPCL's) with various molar ratios of β-caprolactone monomer to each hydroxyl group of lignin (CL/OH ratios) was studied by TG-FTIR. The temperature was varied from 20 to 800C. Thermal degradation temperatures (Td's) of alcoholysis lignin (AL) and ALPCL's were determined using TG curves. Td increased with increasing CL/OH ratio, suggesting that AL becomes thermally stable after the derivatization with PCL chains. Mass residue (MR) at 500C was also determined using TG curves. MR values decreased with increasing CL/OH ratios. The evolved gases formed by thermal degradation of ALPCL's at various temperatures were simultaneously analyzed by FTIR. The main peaks observed for the samples are as follows: wavenumber (assignment): 1160 cm-1 (vC-O-), 1260 cm-1(-C(=O)-O-C-), 1517 and 1617 cm-1 (vC=C), 1770 cm-1 (vC=O), 2345 cm-1 (vCO2), 2945 cm-1 (vC-H) and 3700 cm-1 (vOH). It was found that the peak intensities for C=O, CH, C-O-C, OH peaks, which were observed for evolved gases at 430C, increased with increasing CL/OH ratios, suggesting that the evolved gases at 430C are mainly formed by thermal degradation of PCL chains in ALPCL's.

Manuscript Submission: HERE

  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)