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Determination of the residual monomer concentration of ε‐caprolactam in polyamide‐6 using thermogravimetric analysis coupled with Fourier transform infrared spectroscopy gas analysis
Author(s) -
Kurt Samet,
Maier Jonas,
Horny Robert,
Horn Siegfried,
Koch Dietmar,
MoosburgerWill Judith
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50730
Subject(s) - thermogravimetric analysis , caprolactam , fourier transform infrared spectroscopy , polyamide , monomer , materials science , polymerization , infrared spectroscopy , polymer chemistry , analytical chemistry (journal) , polymer , chemistry , chemical engineering , organic chemistry , composite material , engineering
For the anionic polymerization of ε‐caprolactam to polyamide‐6 the residual monomer concentration in the final polymer is an important characteristic. To determine this residual ε‐caprolactam monomer concentration, a fast and fail‐safe method was developed, which couples thermogravimetric analysis (TGA) with Fourier transform infrared spectroscopy (FTIR) gas analysis. FTIR allows an identification of the types of gasses released during heat treatment. Calibration of the infrared absorbance of ε‐caprolactam and the corresponding mass loss in TGA allows a quantitative evaluation of the ε‐caprolactam monomer release. Low‐heating rates and powdery samples guarantee high‐precision measurements.