Low-frequency Raman evidence for straight chain segments in an UHMW polyethylene gel

摘要

The structure of ultrahigh-molecular-weight polyethylene (UHMW PE) macromolecules in gel and block-oriented states was studied using the longitudinal acoustic modes (LAM) analysis. The spectra were excited by the line 632.8 nm of a 60-mW He-Ne laser and the light scattered at 90° was registered. Results evidenced a presence of a certain amount of straight chain segments (SCS). Average length of the SCS was about 3 nm. In the fibers drawn from the gel-derived preforms, the appearance of the taut tie chains was observed.