Filler Particles in Rubbers by PF mode AFM

Distribution of Filler Particles in Rubbers by PF mode AFM Sample Preparation Microtoming 

Natural rubber (polyisoprene, PI) mixed with 1.8 PHR DCP for chemical cross-linking and 15 PHR carbon black N660 (Degussa AG, Hiirth, Germany) with a primary particle diameter of 67 nm [142] is microtomed at low temperatures to provide 10 pm thin slices with smooth sample surfaces. These slices are mounted on metallic sample holder discs using pressure sensitive adhesive. 

Pulsed Force Mode Imaging of Filler Distributions 

We use the standard pulsed force mode-AFM procedures (Sect. 3.2.4) for the investigation of the filler distribution. A contact mode AFM cantilever with a spring 

By appropriate selection of the markers for stiffness and adhesion, it is possible to differentiate the rubbery matrix (low modulus, high adhesion) and the filler particles (high modulus, low adhesion). As shown in Fig. 3.66, elevations in the height image corresponds well with areas of higher stiffness and lower adhesion. The carbon black particles can be observed in a non-homogeneous distribution at the surface of this microtomed specimen. 

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