4. Conclusions
In the current work, the effects of potassium permanganate
surface treatment on the UHMWPE fibers reinforced NR composites
were investigated and the following conclusions were obtained.
UHMWPE fibers were treated using potassium permanganate
solution, and the chemical and the morphological changes were
characterized by FTIR, XPS and SEM. The analyses indicated that
after surface treatment, the content of oxygen-containing groups
were increased on the surface of UHMWPE fibers and the SEM
observation showed the increasing surface roughness with potassium permanganate treatment.
The modulus and tensile stress at a given elongation of treated
UHMWPE fibers/NR composites increased markedly, compared
with as-received UHMWPE fibers/NR composites and pure NR. This
was due to the improved interfacial adhesion between fiber and NR
matrix. The tear strength and the hardness of the composites
increased with adding as-received and treated UHMWPE fibers.
The results of the dynamic mechanical tests showed that the
storage modulus and the tangent of the loss angle are decreased in
the potassium permanganate treated UHMWPE fibers/NR composites. From SEM images, it was observed that there were several
micro-fibrillations between the treated fiber and NR matrix, which
meant the interfacial adhesion strength in the composite was great.
4. ConclusionsIn the current work, the effects of potassium permanganatesurface treatment on the UHMWPE fibers reinforced NR compositeswere investigated and the following conclusions were obtained.UHMWPE fibers were treated using potassium permanganatesolution, and the chemical and the morphological changes werecharacterized by FTIR, XPS and SEM. The analyses indicated thatafter surface treatment, the content of oxygen-containing groupswere increased on the surface of UHMWPE fibers and the SEMobservation showed the increasing surface roughness with potassium permanganate treatment.The modulus and tensile stress at a given elongation of treatedUHMWPE fibers/NR composites increased markedly, comparedwith as-received UHMWPE fibers/NR composites and pure NR. Thiswas due to the improved interfacial adhesion between fiber and NRmatrix. The tear strength and the hardness of the compositesincreased with adding as-received and treated UHMWPE fibers.The results of the dynamic mechanical tests showed that thestorage modulus and the tangent of the loss angle are decreased inthe potassium permanganate treated UHMWPE fibers/NR composites. From SEM images, it was observed that there were severalmicro-fibrillations between the treated fiber and NR matrix, whichmeant the interfacial adhesion strength in the composite was great.
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