Abstract
An improved formulation for the nucleation rate j of a generalized sequential process is presented. The topological nature of linear chains was formulated by introducing activation energy for chain sliding diffusion within crystals. It is shown that when chain sliding diffusion is easy extended chain crystals (ECC) will be formed from folded chain crystals (FCC) by lamellar thickening, whereas when it is difficult FCCs will be formed, which shows the origin of ECC and FCC. It indicates that there is no essential difference in formation mechanism between FCC and ECC. It is predicted that polymers crystallized from the melt into hexagonal form will change continuously from FCC to ECC with increasing crystallization temperature.
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