ABSTRACT
A very large number of research papers regarding the structure of drawn crystalline polymers, such as polyethylene (PE) and isotactic polypropylene, exist in publications. The dependence of the modulus of ultrahigh-molecule-weight PE fibers on the fraction of the taut tie molecules (TTms) has been explained by comparing the values of modulus calculated using a sample model with experimental results. The TTMs in oriented crystalline polymers play a decisive role on modules of the material. The species associated with the peak at lower temperature is considered to result from the cluster-shaped TTMs. The TTMs, with equal contour length and end-to-end distance, in both irradiated and unirradiated samples would reach the same relaxed state while the temperature was increased to one certain value. The arrangement of the TTMs due to lack of methods of actually characterizing them is rather uncertain.
