A new conception on the toughness of nylon 6/silica nanocomposite prepared viain situ polymerization

Abstract

A novel method, in situ polymerization, was used for the preparation of nylon 6/silica nanocomposites, and the mechanical properties of the nanocomposites were examined. The results showed that the tensile strength, elongation at break, and impact strength of silica‐modified nanocomposites exhibited a tendency of up and down with the silica content increasing, while those of silica‐unmodified nanocomposites decreased gradually. It also exhibited that the mechanical properties of silica‐modified nanocomposites have maximum values only when 5% silica particles were filled. Based on the relationship between impact strength of the nanocomposites and the matrix ligament thickness τ, a new criterion was proposed to explain the unique mechanical properties of nylon 6/silica nanocomposites. The nylon 6/silica nanocomposites can be toughened only when the matrix ligament thickness is less than τc and greater than τa, where τa is the matrix ligament thickness when silica particles begin to aggregate, and τc is the critical matrix ligament thickness when silica particles begin to toughen the nylon 6 matrix. The matrix ligament thickness, τ, is not independent, which related with the volume fraction of the inorganic component because the diameter of inorganic particles remains constant during processing. According to the observation of Electron Scanning Microscope (SEM), the process of dispersion to aggregation of silica particles in the nylon 6 matrix with increasing of the silica content was observed, and this result strongly supported our proposal. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 789–795, 1998

Mechanical, Electrical, and Glass Transition Behavior of Copper–PMMA Composites

“…The analysis of the mechanical parameters carried out previously indicates that the infiltration of metallic particles of nanometric size has an important effect on the mechanical properties, achieving a change in the yield behavior of the material, compared with the effect taken place by the metallic particles of micrometric size. The facts mentioned above agree with results reported by other authors [1,[36][37][38][39]. This behavior could be due to the small size of the nanometric particles related with the great surrounding polymeric area.…”

Nylon 6/SiO2Nanocomposites Synthesized by in situAnionic Polymerization

“…The observations related to impact strength, flexural strength and flexural modulus were in agreement with the results reported in the literature [21,22].…”

Recovery and utilisation of non-metallic fraction from waste printed circuit boards in polypropylene composites

“…Table 3 rep-resents the mechanical properties of PP/PCB composite at different compositions. The results are in line with the results obtained by Ou et al 15 A strong interfacial bonding between the matrix and fillers is required for effective stress transfer from the filler to matrix and vice versa to increase the strength of the composite. Thus, incorporation of 3 wt-% maleic anhydride grafted polypropylene (MAPP) to PP/10%PCB results increased mechanical properties as compared to the composite without any compatibiliser.…”