Time-resolved ex situ Raman/FT-IR spectroscopic study of structural changes in polymeric gears during operation: Towards the development of operando spectroscopic systems for polymer gears

H. Okubo; K. Kobayashi; D. Iba; I. Moriwaki; S. Yao; S. Sasaki

Polymer Testing (Sep 2022)

Time-resolved ex situ Raman/FT-IR spectroscopic study of structural changes in polymeric gears during operation: Towards the development of operando spectroscopic systems for polymer gears

H. Okubo,
K. Kobayashi,
D. Iba,
I. Moriwaki,
S. Yao,
S. Sasaki

Affiliations

H. Okubo: Kyoto Institute of Technology, Department of Mechanical Engineering, Kyoto, Goshokaidou-chou Matsugasaki Sakyo-ku Kyoto, Kyoto, 606-8585, Japan; Corresponding author.
K. Kobayashi: Graduate School, Kyoto Institute of Technology, Department of Mechanical Engineering, Kyoto, Goshokaidou-chou Matsugasaki Sakyo-ku Kyoto, Kyoto, 606-8585, Japan
D. Iba: Kyoto Institute of Technology, Department of Mechanical Engineering, Kyoto, Goshokaidou-chou Matsugasaki Sakyo-ku Kyoto, Kyoto, 606-8585, Japan
I. Moriwaki: Kyoto Institute of Technology, Department of Mechanical Engineering, Kyoto, Goshokaidou-chou Matsugasaki Sakyo-ku Kyoto, Kyoto, 606-8585, Japan
S. Yao: Fukuoka University, Department of Chemical Engineering, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
S. Sasaki: Tokyo University of Science, Department of Mechanical Engineering, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan

Journal volume & issue: Vol. 113
p. 107675

Abstract

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In this study, time-resolved ex situ Raman and Fourier transform infrared (FT-IR) spectroscopy were performed to monitor structural changes in a polyamide (PA) 66 gear during operation and reveal the failure mechanisms of the material. A gear test was performed using a lab-built gear tester, which is a power-absorption type. Raman and FT-IR analyses were performed on the side gear surfaces around the root of the gear (at the side of the active flank), where a bending stress is continuously loaded during operation. The results showed that the crystallinity changed, amide related bonds were broken, trans-gauche (TG) transformation occurred, and a change in the inner stress condition of the PA66 gear occurred over time. It was concluded that these changes interact with each other during operation and are related to the failure of the PA66 gear, such as the initiation of the plastic gear degradation.

Published in Polymer Testing

ISSN: 0142-9418 (Print); 1873-2348 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Chemical technology: Polymers and polymer manufacture
Website: https://www.journals.elsevier.com/polymer-testing

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