電子顕微鏡によるポリプロピレンの環境応力割れの観察

概要

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It is important to study the craze propagation process in connection with the environmental stress cracking. In various chemical environments, thc crazes were induced on the polypropylene specimens. And the propagation of these crazes was observed electron microscopically by using the surface replica method. The shape of crazes was influenced by the kind of the environmental agents, and it was observed that the shape in polypropylene was strongly affected by the environments in the order of the concentrated sulfuric acid, isopropanol, castor oil, Noigen, ethyleneglycol, water and air. Under the environments giving a slight influence on polypropylene, the initial small crazes had usually curved shape but later they became to show branching. And the propagation of crazes became to slow or stop. On the other hand, the crazes under the environments giving severe influence such as isopropanol and castor oil were straight and sharp initially. These crazes propagated rapidly, and caused the specimens to crack. The typical craze propagation process in various environments was indicated schematically in Fig. 21.
社団法人日本材料学会の論文
1975-10-15