Abstract
The morphology and structure of pristine polyparaphenylene (PPP) have been investigated in detail using transmission electron microscopy techniques. A comparison is made between three samples prepared by the different polymerization techniques described by Kovacic, Yamamoto and Fauvarque. The morphology is either fibrillar or mosaic-like. The crystallinity, the size of crystallites and their relative orientation are different. The unit cells were indexed to be monoclinic. A single-crystal diffraction pattern is obtained for Yamamoto PPP, suggesting the presence of extended crystalline lamellae. This was confirmed by dark-field imaging where moire patterns show the dimension of the lamellae (50 to 100 nm).
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