Summary
The uniaxial deformation and recovery of primarily amorphous poly(butylene terephthalate) (PBT) has been investigated by simultaneous FTIR spectroscopy and stress-strain measurements. Contrary to annealed, crystalline samples the stress-induced transformation of the polymer chains to a conformation deviating slightly from the planar all-trans crystalline β-form has been found almost irreversible.
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Holland-Moritz, K., Siesler, H.W. Characterization of deformation phenomena in polymers by rapid-scanning fourier transform IR (FTIR) spectroscopy and mechanical measurements. Polymer Bulletin 4, 166–170 (1981). https://doi.org/10.1007/BF00263057
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DOI: https://doi.org/10.1007/BF00263057