Nonspherical polystyrene (PS)/poly(n-butyl methacrylate) (PBMA) composite particles with uneven surfaces were produced by seeded dispersion polymerization of BMA with 1.65-m, monodisperse, spherical PS seed particles. The composite particles consisted of a PS core and an incomplete PBMA shell. The formation mechanism of such nonspherical particles was discussed.

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The tensile static and fatigue tests for conical shaped FRP joints using polymeric adhesives (FRP joint) were conducted at wide ranges of loading rate and temperature. The time and temperature dependence on the static and fatigue strengths of the FRP joints were investigated from the viewpoint of viscoelastic behavior of the matrix resin of FRP.The static and fatigue strengths and fracture modes of the FRP joints depended on time to fracture and test temperature. The reciprocation law of time and temperature for the viscoelastic behavior of the matrix resin of FRP holds for the static and fatigue strengths of the FRP joints. Therefore, the master curves of static and fatigue strengths for the FRP joints can be obtained, and this fact enables us to estimate the fatigue strength at an arbitrary temperature and the number of cycles to fracture.