引張変形を受けるポリマ材のミクローナノ構造変化のAFMによる評価

概要

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Neck propagation of polymeric materials under tension is a characteristic feature which can be physically explained by the deformation induced evolution of molecular chain structure. In this study, atomic force microscope is applied to glassy polymer with tensile deformation to observe the hierarchical structures at successive molecular to macrolevels, and to clarify the quantitative relation between micro- and macroscopic deformation behaviors. First, hierarchical structure of fibrillar morphology on drawn amorphous polycarbonate film were observed : microfibril structure with a diameter between 5 and 7μm ; that with a diameter between 1 and 2.5 μm ; nanofibrils with a diameter of around 100 nm ; and regular chain pattern corresponding to the crystalline packing. Second, microscopic lattice pattern marked on surface of the specimen was employed to investigate the relation between micro- and macroscopic deformation behaviors. Macroscopic deformation and orientation of microfibril structure were quantitatively measured around the neck, which revealed that the rotation of the aligned microfibril structures were behind to that of the principal direction of plastic stretch due to shear strain by necking.
一般社団法人日本機械学会の論文
1998-03-25