COMPUTER-SIMULATION OF CURVED CRYSTAL HABITS - POLYMER CRYSTALLIZATION UNDER AN ANISOTROPIC GROWTH CONDITION

Computer simulation was carried out to study the morphological change in the lateral habit of polyethylene single crystals grown from the me lt. Monte Carlo simulation was utilized for modelling the processes of surface nucleation and step propagation on the growth faces of a two- dimensional crystal with hexagonal packing. Anisotropy of growth was i ntroduced in the simulation by choosing different rates for these proc esses on the {110} and {100} faces. Depending on the ratio of the step propagation velocity to the rate of increasing width of the growth fa ce, the computer simulation produced curved crystals of truncated loze nge or lenticular shape, both of which have been observed experimental ly. The change in morphology has been analysed quantitatively. Copyrig ht (C) 1996 Elsevier Science Ltd.