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Morphology, crystal structure, and orientation of poly-p-oxybenzoate on mica

✍ Scribed by Frantisek Rybnikar; P. H. Geil

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
768 KB
Volume
35
Category
Article
ISSN
0887-6266

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✦ Synopsis

Polymerization of p-acetoxybenzoic acid between mica sheets, from both the melt and dilute solution, in a wide range of polymerization temperatures (180-400ЊC) yields an epitaxial-like overgrowth of PpOBA on the mica cleavage surface. The PpOBA overgrowth forms long rows by lateral aggregation of ribbon crystals situated in three substrate directions rotated by 60Њ. The c-axes of the PpOBA phase I and II lattices are parallel to the 001 plane of the mica, coinciding with the a-axes of the mica hexagonal structure. The a I -and b II -axes lie predominantly on the mica surface. The surface-orienting effect is tentatively attributed to surface steps and or/polar effects; lattice matching does not occur. The recrystallization of bulk polymer samples previously prepared also leads to ordering between mica like that in melt or solution polymerization.

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