Table of Contents
Journal of Polymers
Volume 2017 (2017), Article ID 4253181, 10 pages
https://doi.org/10.1155/2017/4253181
Research Article

Round Robin Tests to Determine Fiber Content of Carbon Fiber-Reinforced Thermoplastic Composites by Combustion and Thermogravimetry

1Polymer Subcommittee of the Industrial Technology Cooperative Promotion Committee, Umezono 1-1-1, Tsukuba, Ibaraki 305-8560, Japan
2Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
3Human Life Technology Research Institute, Toyama Industrial Technology Center, Futagami-cho 150, Takaoka, Toyama 933-0981, Japan
4Western Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute, Agaminami 2-10-1, Kure, Hiroshima 737-0004, Japan
5Industrial Research Institute of Shizuoka Prefecture, Makigaya 2078, Aoi-ku, Shizuoka-shi, Shizuoka 421-1298, Japan

Correspondence should be addressed to Masahiro Funabashi

Received 24 May 2017; Revised 14 September 2017; Accepted 16 October 2017; Published 14 November 2017

Academic Editor: Yves Grohens

Copyright © 2017 Masahiro Funabashi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To propose methods to determine the fiber content of carbon fiber-reinforced plastics (CFRP) for the International Organization for Standardization, the fiber contents of CFRP with polyamide-6 were measured using a combustion method based on ISO 14127 and a thermogravimetry method based on the modified ISO 9924-3 under a round robin test managed by the Polymer Subcommittee of the Industrial Technology Cooperative Promotion Committee in Japan. In the combustion method, the fiber contents of the CFRTP (~0.3 g) were determined by the mass of carbon fiber remaining after burning (ISO 14127). The fiber contents in weight of the CFRTP with 8, 9, or 10 plies were determined to be 55.720%, 61.088%, or 65.326%, respectively, by 17 research institutes. In the thermogravimetry method, the fiber contents of the CFRTP (~10 mg) were determined by the mass of carbon fiber remaining after heating it to 600°C in nitrogen gas using thermogravimetry apparatus (modified ISO 9924-3). The fiber contents of the CFRTP with 8, 9, or 10 plies were determined to be 56.908%, 61.579%, or 64.819%, respectively, by 8 research institutes. It was confirmed that thermogravimetry method was as accurate as the combustion method based on ISO 14127.