S. Isoda
May 1, 1984
Citations
0
Influential Citations
18
Citations
Journal
Polymer
Abstract
Abstract When poly( p -xylylene) is synthesized from gaseous monomers, it grows epitaxially on substrates. The effects of the substrate and annealing on the epitaxy are examined by growing the polymer on cleavage (001) surfaces of four kinds of alkali halides (NaCl, KCl, KBr and Kl). The polymer crystallizes with its chains oriented along the 〈100〉 and 〈010〉 directions of the substrates and the faster growth planes are parallel to the (001) plane of substrate, i.e., the (010) plane of the α-form crystal and the (100) plane of the β-form. The degree of orientation is the highest on KBr and the lowest on NaCl. The lattice matching requirement is important in the epitaxial synthesis. The observed orientation of the polymer chain on each substrate is compared with the orientation expected from a minimum of interfacial potential energy calculated on the basis of dispersion-repulsive forces between atoms in the polymer and ions in the substrate. The orientational angle of polymer chain on the substrates and the degree of its orientation are qualitatively explained in terms of the processes of monomer deposition, polymerization and crystallization under the directive influence of the substrate.