1979
DOI: 10.1007/bf01761117
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Study of stress-induced changes in poly(ethylene terephthalate) through Fourier transform infrared spectroscopy

Abstract: The molecular level changes resulting from an external stress applied onto a highly uniaxially oriented poly(ethylene terephthalate) film has been studied. For this purpose, a new technique -Fourier Transform Infrared Spectroscopy -has been employed. Stressqnduced differences are visible in a number of bands within the IR spectra of stressed PETP films. From the assignments of these IR bands, it is inferred how external stresses applied on the polymer films are actually transmitted to the molecular level. The … Show more

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Cited by 13 publications
(2 citation statements)
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“…The emergence of strong β ‐phase related absorbance peaks concurrent with reducing α ‐ and γ ‐phase related peaks even with the addition of 2 wt.‐% CaCl 2 indicated the crystalline phase transformation from α ‐ and γ ‐phases in neat PVDF to the favored β ‐crystalline form in PVDF–CaCl 2 . Figure 1(D) shows the quantitative estimation of the α ‐ (763 cm −1 ), γ ‐ (1 232 cm −1 ), and β ‐ (1 279 cm −1 ) crystalline phase FTIR‐TS absorbance changes relative to the 1 072 cm −1 band (internal thickness band) 21, 22. The relative increase in the β ‐phase and the corresponding decrease in the α ‐ and γ ‐phases even at lower concentrations of CaCl 2 (≤5 wt.‐%) in PVDF confirmed the CaCl 2 ‐induced β ‐crystalline formation in PVDF as discussed previously in Figure 1(C).…”
Section: Resultsmentioning
confidence: 99%
“…The emergence of strong β ‐phase related absorbance peaks concurrent with reducing α ‐ and γ ‐phase related peaks even with the addition of 2 wt.‐% CaCl 2 indicated the crystalline phase transformation from α ‐ and γ ‐phases in neat PVDF to the favored β ‐crystalline form in PVDF–CaCl 2 . Figure 1(D) shows the quantitative estimation of the α ‐ (763 cm −1 ), γ ‐ (1 232 cm −1 ), and β ‐ (1 279 cm −1 ) crystalline phase FTIR‐TS absorbance changes relative to the 1 072 cm −1 band (internal thickness band) 21, 22. The relative increase in the β ‐phase and the corresponding decrease in the α ‐ and γ ‐phases even at lower concentrations of CaCl 2 (≤5 wt.‐%) in PVDF confirmed the CaCl 2 ‐induced β ‐crystalline formation in PVDF as discussed previously in Figure 1(C).…”
Section: Resultsmentioning
confidence: 99%
“…Some monitored material dilatation by measuring variation of free volume size and distribution due to loading [25,26,27,28,29,30,31]. Others examined distortion by inferring chain reorientation and changes in side group concentration from infrared spectra [32,33,34]. At the point of incipient rupture, still others used a combination of techniques to identify correlations among bond scissions, radical concentration, and crack nucleation [35,36,37,38].…”
Section: Introductionmentioning
confidence: 99%