抄録
Nylon composites containing ultrafine particles such as gold, silver and copper (I) oxide, were prepared by the RAD process. Various properties of the composites such as optical, mechanical, and electrical properties were studied in order to examine the interfacial properties between ultrafine particles and nylon matrix. The composites showed such colloidal colors as red (Au), yellow (Ag), and yellowish green (copper (I) oxide) which were all uniformly transparent without metalic luster. Both solid film of the composite and m -crezol solution of the composite maintained its colloidal color for a long time without agglomeration or aggregation of the particles. The mechanical relaxation of the composites suggested that the rigid nylon region around particle was formed by strong interaction between particles and nylon molecules. This region stably kept holding ultrafine particles in nylon matrix, and it also prevented particles from agglomerating. The composites showed interesting elecrical properties different from those of nylon alone because the rigid region of nylon polarized very slowly by applying the electric field. The time lag in the electrical response was caused by slow relaxation of the interfacial region.
