ELECTRON MICROSCOPIC OBSERVATION ON THE MATERIAL TRANSFORMED FROM THE SINGLE CRYSTAL OF p-AMINOHIPPURIC ACID THROUGH THE THERMAL SOLID STATE POLYCONDENSATION PROCEDURE

抄録

Morphological change in a product from p-aminohippuric acid monomer single crystal through the thermal solid state polycondensation reaction at 170°C up to 1200h is observed mainly by means of scanning electron microscopy. In the early stage of the polymerization process (100-200h), many rectangular prisms ca. 5μm long are observed on the surface of the specimen. A needle-shaped or fibrillar material is formed after the polymerization for ca. 250h. It is found that the surface of the specimen is finally covered with the microfibrils ca. 100nm in diameter.