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To promote dispersion of nano-silica in polypropylene (PP), a polymerizable foaming agent p-vinylphenylsulfonylhydrazide was synthesized and grafted onto the nanoparticles via free-radical polymerization. It was found that the grafted poly(p-vinylphenylsulfonylhydrazide) played dual role when being melt mixed with PP. The side sulfonylhydrazide groups were gasified to form polymer bubbles, leading...
The sliding wear performance of epoxy composites filled with nano-sized Al 2 O 3 particles was studied in the present paper. To enhance the interfacial interaction between the fillers and the matrix polymer, the nanoparticles were pretreated by either silane coupling agent or graft polymerization. The experimental results indicated that the frictional coefficient and wear rate of epoxy...
To prepare epoxy-based composites with low frictional coefficient and high wear resistance, nanometer silicon nitride particles were added. Dry sliding wear tests indicate that the composite materials exhibit significantly improved tribological performance and mechanical properties at rather low filler content (typically less than 1vol.%). Unlike the severe wear observed in unfilled epoxy dominated...
To overcome the disadvantages generated by the loosened nanoparticle agglomerates dispersed in polymer composites, an irradiation grafting method was applied to modify nanosilica by covalently bonding polyacrylamide (PAAM) onto the particles. When the grafted nanosilica was added to epoxy, the curing kinetics of the matrix was accelerated. Moreover, the grafting PAAM can take part in the curing of...
The interfacial structure of carbon fiber/polyetheretherketone (CF/PEEK) composites has been studied with Raman and X-ray photoelectron spectroscopy. Analysis of the fibers isolated from the composites proved that the polymer segments tended to form strong interactions with the fiber on the surface. Study of the fiber with a thin layer of PEEK coating further revealed that melting of the polymer plays...
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