FT-IR studies on the mechanical response of the crystalline fraction in ultrastrong polyethylene tapes |
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Authors: | S Sheiko H Frey M Möller |
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Institution: | (1) Chemische Technologie, Universiteit Twente Enschede, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Institute of Chemical Physics of the USSR Academy of Sciences, Moscow, USSR |
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Abstract: | FT-IR spectra of UHMW-PE tapes with different moduli have been studied in dependence of mechanical deformation and stress. Small spectral variations have been revealed in the difference spectra. Band shifts of the 730/720 cm–1 doublet have been observed under stress relaxation and upon stretching. A clear correlation between the shift of crystalline bands and the Young's modulus could be determined. Polarized measurements demonstrated variations in the mechanical response of nearly perfectly oriented and non-oriented crystallites. Crosslinking was performed by blending the polyethylene with 10% polysilane and UV-irradiation of the drawn material. The band shift increases as the linkage between oriented crystal blocks is improved with higher draw ratios and chemical crosslinking. |
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Keywords: | Ultrahigh molecular weight polyethylene strain induced IR band shifts stress distribution in PE fibres gel spinning polysilanes |
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