Abstract
Acetylene was polymerized on various substrates of the systematic series of homologous isomorphic organic crystals for understanding the mechanism of epitaxial polymerization. Electron microscopy revealed that fibrillar polyacetylenes grew on the substrates and oriented in a zigzag fashion in the specific directions (the [110] and or [010] directions on the (001) substrate surfaces). The number of orientation directions and the orientation distribution of fibrils in cis - and trans - polyacetylenes were characterized for each substrate. The observed growth patterns were mostly explained by geometrical lattice mismatching factors. The exception is the case between trans -polyacetylene and anthracene which is discussed from the view point of interfacial potential energy.
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