Journal
APPLIED SURFACE SCIENCE
Volume 512, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145662
Keywords
Fibres; Polymer-matrix composites (PMCs); Interface; Plasma graft
Categories
Funding
- National Defense key program Fundamental Research program [A35201XXXXX]
- Dalian Science and Technology Innovation Fund Project [2019J11CY007]
- National Natural Science Foundation of China [51303106]
- Fundamental Research Funds for the Central Universities [DUT18GF107]
- Aviation Science Foundation [20173754009]
- LiaoNing Revitalization Talents Program [XLYC 1802085, XLYC 1807003]
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The poor adhesion between polybenzoxazole (PBO) fibre and resin can lead to limitations in the composites formed for practical applications. Air atmospheric dielectric barrier discharge was applied to graft multi-carboxyl polyurethane (C-PU) designed and synthesised by introducing polar functional groups on the PBO fibre surface to enhance interfacial bonding. The effects of power density and C-PU concentration on the composites formed, as well as the surface ageing time of post-grafted fibres, were studied. The surface chemical composition and morphologies of the grafted PBO fibre were characterised by X-ray photoelectron spectroscopy, attenuated total reflection Fourier transformed infrared spectroscopy, and scanning electron microscopy. Mechanical performance testing showed that the interlaminar shear strength of the PBO/BMI composites is significantly improved and that the fibre surface activity can be maintained for up to 15 days. More importantly, the transition temperature of the as-prepared C-PU graft matched with the curing temperature of the BMI resin.
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