Depth Analysis of Polymer Degradation by MALDI-TOF-MS

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  • KITADA Yukio
    Material Analysis Department, Analytical Technology Research Center, Yazaki Research and Technology Center, YAZAKI Corporation
  • OKAMOTO Mami
    Material Analysis Department, Analytical Technology Research Center, Yazaki Research and Technology Center, YAZAKI Corporation
  • MIURA Makiko
    Material Analysis Department, Analytical Technology Research Center, Yazaki Research and Technology Center, YAZAKI Corporation
  • TOYODA Kazuhiro
    Material Analysis Department, Analytical Technology Research Center, Yazaki Research and Technology Center, YAZAKI Corporation
  • SATO Hiroaki
    Department of Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • MIZUKADO Junji
    Department of Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)

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Other Title
  • MALDI-TOF-MSを活用した高分子材料の劣化深さ方向分析
  • MALDI-TOF-MS オ カツヨウ シタ コウブンシ ザイリョウ ノ レッカ フカサ ホウコウ ブンセキ

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Description

<p>Analysis near the surface is crucial for researching the degradation process, since degradation begins with on external stimulation, such as light and heat. Poly (butylene terephthalate) (PBT) is an engineering plastic with a good balance of mechanical and electrical properties, widely used in automobile components, such as connectors. We report here on a technique to analyze the depth profile of degradation products using matrix assisted laser desorption/ionization time-of–flight mass spectrometry (MALDI-TOF-MS), formed the upon thermal aging of PBT. Pristine and aged sample pieces were shaved into thin films by a microtome for MALDI-TOF-MS analysis of the depth profile. The tensile strength was drastically reduced and the COOH/COOH end-group was increased for bulk samples after aging at 180°C for 200 hours. The degradation proceeds via thermo-oxidation pathway mainly because of the appearance of the (CH2)3-COOH/COOH end group in the layers shallower than 155 μm. It was suggested that the decomposition into low-molecular-weight products in the layers shallower than 155 μm affected the decrease in tensile strength. The MALDI-TOF-MS would be useful for the analysis of the degradation process in depth profile.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 70 (4.5), 247-253, 2021-04-05

    The Japan Society for Analytical Chemistry

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