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In this work, the thermal behavior of the regularity modes in Raman spectra of polyethylene with different densities and random ethylene/1-hexene copolymers with varying content of comonomer are studied. We demonstrate especially that the vibrational modes at 1062 and 2850cm↙1 are related to a critical sequence length of trans-conformers of 6⬜8 CH2 groups, while the modes at 1130, 1170, 1295, and...
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