Abstract
High-molecular weight nylon 66/modified clay (Mclay) nanocomposites with a low apparent viscosity were prepared by in-situ polymerization and post solid-state polycondensation. Thermogravimetric analysis and X-ray diffraction patterns of the Mclay revealed that cetyltrimethyl ammonium bromide successfully inserted into the interlayers of the clay. Scanning electron microscope images of the cross sections showed that the Mclay was well-dispersed in the nylon 66 matrix. The effects of clay on the mechanical, rheological, and thermal properties of the nanocomposites were investigated using an Instron 5969 machine, a capillary rheometer, and a differential scanning calorimeter. The results indicated that the incorporation of a very small amount of Mclay considerably decreased the shear viscosity of the nanocomposites and increased the melt index, acting as a viscosity reducer. More importantly, the mechanical properties and spinnability of the nylon 66/Mclay nanocomposites were not affected by the viscosity reducer.
Highlights
Nylon 66 (PA66 or polyamide 66) is a versatile engineering plastic within the nylon family.It is widely used because of its light weight, good mechanical properties, high abrasion resistance, excellent chemical resistance, and relatively low cost [1,2,3,4,5]
Polyamide/layer silicate composites have attracted considerable attention since they were first reported by Okada, in 1987 [6]
Song et al prepared nylon 66/clay nanocomposites via condensation polymerization, which showed enhanced thermal stability and flame-retardant properties compared with those features of pure PA66 [8]
Summary
Nylon 66 (PA66 or polyamide 66) is a versatile engineering plastic within the nylon family. Some reports have suggested a low apparent viscosity of nylon 6 clay composites, there have been few reports on reducing the apparent viscosity of the melt of high-molecular weight nylon 66 without changing its mechanical properties. We report an effective approach to preparing high-molecular weight nylon 66/modified clay (Mclay) nanocomposites on the basis of an in-situ intercalative polymerization and post solid-state polycondensation. These results indicate that the clay enhanced the tensile strength of the nylon 66/Mclay nanocomposites. The apparent viscosity of the nylon 66/Mclay nanocomposites was reduced, enabling easy processing
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