Journal
POLYMERS
Volume 9, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/polym9040143
Keywords
aramid fibers; sizing agents; vinyl epoxy composites; adhesion properties
Categories
Funding
- Nation Basic Research Program of China (973 Program) [2011CB606101]
- National Natural Science Foundation of China [51603120, 51673039]
- Shanghai Pujiang Talent Program [16PJ1400300]
- Fundamental Research Funds for the Central Universities [16D110618]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [LK1602]
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To improve interfacial adhesion between aramid fibers and vinyl epoxy resins, a series of hydroxyl and ethylene-functional aromatic polyamides ((ClPPTA) m-R') with different chain segments were successfully synthesized via a one-pot low-temperature polycondensation. The hydroxyl and ethylene-functional aromatic polyamides were characterized by Fourier transform infrared spectroscopy (FT-IR), solid-state C-13 CP/MAS nuclear magnetic resonance spectroscopy (C-13 CP/MAS NMR), thermal gravimetric analysis (TGA), and wide-angle X-ray diffraction (WXRD). The contact angle of the hydroxyl and ethylene-functional aromatic polyamides films were measured. The hydroxyl and ethylene-functional aromatic polyamides were used as the sizing agents for aramid fiber/vinyl epoxy composites. The surface chemical composition and morphology of the unsized and sized fibers were identified using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The interfacial adhesion between aramid fibers and vinyl epoxy composites was investigated by the micro-debond tests. The results showed that the interfacial shear strength between the sized aramid fibers and vinyl epoxy composites was greatly improved.
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