Characterization of deformation phenomena in polymers by rapid-scanning Fourier transform infrared (FTIR) spectroscopy and mechanical measurements. I. The stress-induced crystalline phase transition in poly(butylene terephthalate).

In: Journal of Polymer Science, Polymer Letters Edition, Jg. 17 (1979) ; Nr. 7, S. 453-458
ISSN: 0360-6384
Zeitschriftenaufsatz / Fach: Chemie
The intensity changes in the CH2 absorption bands at 1460 (relaxed) and 1485 cm-1 (strained) bands in the FTIR spectra of poly(butylene terephthalate) [24968-12-5] as functions of strain are used to quant. represent structural transformation progress and may be correlated with mech. stress-strain diagrams and wide-angle x-ray results. Unlike x-ray diffraction measurements, IR spectroscopic changes characteristic of the phase transition, are obsd. at 2% strain and extend beyond 15% strain up to sample failure.