期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 105, 期 -, 页码 108-117出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2017.11.006
关键词
Glass fibre reinforced polymer; Impedance spectroscopy; Moisture uptake; Dielectric changes
资金
- EPSRC project DURACOMP (Providing Confidence in Durable Composites) [EP/K026925/1]
- EPSRC [EP/K026925/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K026925/1] Funding Source: researchfish
This is a first study comparing dielectric spectroscopy and gravimetric measurements of moisture uptake in pultruded glass fibre reinforced polymers (FRPs). Specimens were subjected to sub-Tg hygrothermal aging for 224 days. Impedance spectra in the frequency range 0.1 Hz to 10 MHz were captured during exposure and compared with gravimetric measurements. Moisture concentration was found to increase the FRP's dielectric permittivity monotonically and decrease bulk resistance. High quality dielectric data was obtained as moisture uptake is independent of inherent changes suggested by mass loss which compromise gravimetry. Dielectric measurements remained sensitive to moisture despite significant mass loss, which typically distorts the weight gain process complicating the commonly adopted gravimetric methodology. Real-time dielectric measurements were obtained from FRP specimens continuously immersed in water and without making use of any additional sensing elements. The novel approach adopted is of high commercial impact as moisture uptake control is recognized as a significant problem by industry. (C) 2017 The Authors. Published by Elsevier Ltd.
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