期刊
SURFACE AND INTERFACE ANALYSIS
卷 48, 期 12, 页码 1271-1277出版社
WILEY-BLACKWELL
DOI: 10.1002/sia.6031
关键词
carbon fiber; chemistry; epoxy resin; composites; interface
资金
- National Key Basic Research and Development Program [2011CB605602]
- National Natural Science Foundation of China [51503216]
- Zhejiang Provincial Natural Science Foundation of China [LQ16E030003]
- Natural Science Foundation of Ningbo of China [2015A610015]
Polyacrylonitrile (PAN)-based carbon fibers were electrochemically oxidized in aqueous ammonium bicarbonate with increasing current density. The electrochemical treatment led to significant changes of surface physical properties and chemical structures. The oxidized fibers showed much cleaner surfaces and increased levels of oxygen functionalities. However, it was found that there was no correlation between surface roughness and the fiber/resin bond strength, i.e. mechanical interlocking did not play a major role in fiber/resin adhesion. Increases in surface chemical functionality resulted in improved fiber/resin bonding and increased interlaminar shear strength (ILSS) of carbon fiber reinforced epoxy composites. The relationship between fiber surface functionality and the hydrothermal aging behavior of carbon fiber/epoxy composites was investigated. The existence of free volume resulted from poor wetting of carbon fibers by the epoxy matrix and the interfacial chemical structure were the governing factors in the moisture absorption process of carbon fiber/epoxy composites. Copyright (c) 2016 John Wiley & Sons, Ltd.
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