The traditional view of epitaxial growth of a crystal on an underlying substrate, having appropriate lattice matches, is that the growth proceeds immediately and that nucleation considerations are unnecessary. In the case of substrates having limited dimensions, it is necessary to ensure that the dimensions of the critical secondary nucleus do not exceed the dimensions of the substrate crystal. It is shown that this condition is very important when polymeric substrates are used. In essence, there is a necessity for the elementary growth 'template' of the depositing polymer to fit the elementary existing lamellar template of the substrate. For the case of polyethylene growing on a polypropylene substrate, it is shown that a simple theory explains all the known facts and resolves a current controversy involving epitaxy versus nucleation for that system.
Посилання на статтю:
The role of secondary nucleation in epitaxial growth: the template model / Aaron J. Greso and Paul J. Phillips // Polymer. – 1994. – Vol 35. – P. 3373-3376.