Substrate-induced crystallization of n-paraffins on oriented polyolefins

n-Paraffins of n-C₂₀H₄₂ to n-C₅₀ H₁₀₂ were epitaxially crystallized on oriented polyolefins; polyethylene, polypropylene, poly-1-butene and poly-4-methyl-1-pentene. In most cases, n-paraffin crystals were epitaxially grown on the substrate surface with the (001) basal plane parallel to it, maintaining a two-dimensional lattice coincidence with the polymer substrate. The epitaxial modes with this orientation were classified into the following three types irrespective of the polymers: 1. (1) (001)_p{norm of matrix}SS, 〈110〉_p{norm of matrix}FA, 2. (2) (001)_p{norm of matrix}SS, [010]_p{norm of matrix}FA, 3. (3) (001)_p{norm of matrix}SS, 〈110〉 _p $ ̊ $ ̌gaFA, where p, SS and FA denote n-paraffin crystals, substrate surface and fiber axis of the polymers, respectively. The angle α depends on the kind of polymer substrate. n-Paraffins longer than n-C₄₀H₈₂ were laid down in parallel on the polypropylene substrate with their axes at a 46° angle with respect to the substrate fiber axis.