STRUCTURE AND DEFECTS IN SANIDIC LIQUID-CRYSTALLINE POLYMERS .2. STRUCTURE-ANALYSIS OF SANIDIC POLYMERS BY SIMULATION OF DIFFRACTION PATTERNS FROM MONOMERIC ANALOGS

The diffraction patterns from sanidic polymers normally show 8-10 refl ections of which only 4 or 5 are unique, so that it is impossible to s olve their structure. A large number of equally probable models can ea sily be proposed. In this work, the monomeric analogs have been invest igated by electron diffraction and imaging because they produce diffra ction patterns which are rich in information and which can be analyzed to give the unit cell, its symmetry, and the direction of the molecul e with respect to the cell axes. clear analogies can be drawn with the spacings observed in the polymeric materials above the glass transiti on temperature.