Abstract
The low-frequency Raman spectra of gel-spun polyethylene fibers were recorded in the frequency range of the longitudinal acoustic modes (LAM) localized on all-trans sequences, i.e., on straight-chain segments (SCS). During the experiment, the samples were stressed and held with their ends fixed. As soon as the stress was applied, there appeared a substantial amount of short (as compared to the size of the crystal) all-trans sequences randomly distributed in the amorphous phase. These primary SCS are not stable and decay (coil) within approximately half an hour. Further chain straightening continues in the interfacial regions between the crystalline and amorphous phases. In the course of this process, the individual all-trans sequences in the amorphous bulk are virtually replaced by the SCS adjacent to crystal cores. The final SCS length distribution in the relaxed sample is characterized by an increased fraction of the crystalline SCS penetrating deeply into the amorphous regions with formation of some quantity of taut-tie molecules.
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