原子間力顕微鏡による高分子表面部の弾性率の評価

概要

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This paper describes quantitative estimation of the elastic modulus of latex rubber from AFM force curves. To obtain the force curves, a nano-indentation test using a cantilever with a sharp AFM probe and a micro-indentation test using a cantilever with a glass ball of 10μ m diameter on its tip were performed on the rubber surface. A tensile test was also carried out to obtain a true stress-strain curve of the rubber, which gave a strain-dependent elastic modulus.The results obtained are as follows : (1) Both the elastic module obtained from the tensile test and that obtained from the micro-indentation are almost 2 MPa, showing that the estimation from force curves under certain clear condition is quantitatively effective. (2) The elastic modulus from the force curve of the nano-indentation test with a sharp probe shows a surface effect of the rubber : its high value of 15 MPa in a shallow indentation depth (10 nm) and low value of 5 MPa in a deep indentation depth (200 nm). (3) As a geometric model of the AFM probe tip, a paraboloid of revolution is appropriate in an indentation range less than 300 nm.
近畿大学の論文
2002-12-30