Texture of some crystalline synthetic polymers by electron microscopy

The importance of sample preparation is demonstrated with examples of techniques based on ( 1 ) evaporation in vacuo, ( 2 ) casting from solvent or solvent mixtures, (3) ultrasonic disintegration. Attention is drawn to the “sheaf‐like” arrangement of the microfibrils and to other aspects of the texture. There is evidence of periodicities, but these are considered to vary with the preparation, and may be a consequence of the helical arrangement and “rope‐like” character of the bundles of microfibrils or of a tendency to form a woven texture.