Method for detecting thickness of bonded rubber of carbon black in natural rubber based for reinforcement performance

A method for detecting a thickness of bonded rubber of a carbon black in a natural rubber based for reinforcement performance, comprising steps of:

• (1) using a cutter to prepare a rubber product to-be-detected into a strip rubber product of a predetermined size, clamping the strip rubber product by an atomic force microscope (AFM) dedicated sample clamper and putting the clamped strip rubber product into a chamber of a microtome, and tightening a screw to fix the strip rubber product in the microtome, wherein the rubber product to-be-detected is obtained by mixing a rubber, a carbon black and an additive to form a rubber composite and then performing a vulcanization reaction on the rubber composite, and the additive is one or more selected from the group consisting of a reinforcing filler, an antioxidant, oil and a vulcanization system;
• (2) making a temperature of the fixed strip rubber product be in a range of −100° C.˜−60° C., using an AFM dedicated slicing knife to slice the strip rubber product to cut out a flat surface, cleaning the cut surface of a slice 2-5 times with absolute alcohol at room temperature and placing the slice under a microscope for observation until there is no debris and then for later use;
• (3) scanning the cut surface of the slice prepared in step (2) by an AFM probe at room temperature and atmospheric conditions to obtain a morphological diagram and a phase diagram of the cut surface;
• and
• (4) measuring a thickness of a bonded rubber by observing the morphological diagram and the phase diagram, and determining a reinforcement performance of the carbon black in the rubber product to-be-detected according to the thickness of the bonded rubber.