1968
DOI: 10.1002/app.1968.070120915
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Detection of polymer transition temperatures by infrared absorption spectrometry

Abstract: SynopsisInfrared bands in the 900-1100 cm-1 region are sensitive to thermal energy. These bands can result from intermolecular coupling, producing the crystal lattice, or from intramolecular coupling of the various atomic groups in a regular helix or coiled chain. I n either case an increase in temperature will disrupt the coupling mode, resulting in a form of structural relaxation and a reduction in the integrated absorbance. It is proposed that the temperature at which the peak areas begin to decrease be ass… Show more

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Cited by 41 publications
(8 citation statements)
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“…We r / R Radial profiles for [ W ] at different times, believe that using the local value of F,, in Eq. (18) instead of the spatial average value, b,,, will not lead to significant error in view of the fact that only a small region exists where pn is high, and the effect of p,, on p,,( t ) would be similar to that of K s / T & [see Eq. ( 18) and Fig.…”
Section: [ C ] [ W ]mentioning
confidence: 99%
“…We r / R Radial profiles for [ W ] at different times, believe that using the local value of F,, in Eq. (18) instead of the spatial average value, b,,, will not lead to significant error in view of the fact that only a small region exists where pn is high, and the effect of p,, on p,,( t ) would be similar to that of K s / T & [see Eq. ( 18) and Fig.…”
Section: [ C ] [ W ]mentioning
confidence: 99%
“…The aliphatic regions of the IR spectra of these samples are shown in Figure 7. Typically, in nylon polymers, the IR band around 2880 cm −1 is assigned to the CH symmetric stretch in CH 2 , and another band around 2940 cm −1 is assigned to the corresponding CH asymmetric stretch 20. Because both bands in the nylon‐6 spectrum are located at higher wave numbers than those in nylon‐66, even in the blends in which both nylon‐6 and 66 bands are all observed at higher wave numbers, each of these bands in the physical blend of nylon‐6 and nylon‐66 can be seen as two partially overlapped bands, corresponding to the two phase‐separated components in the blend.…”
Section: Resultsmentioning
confidence: 99%
“…As a result, the absorption of IR beam per unit area of the sample decreases, leading to a reduction in band intensity; [18] on the other hand, the increasing free volume provides more spaces for the segmental motions resulting in larger dipole moment changes, which may increase the band intensity. [25] In Fig. 1(a), the relative peak area decrease with temperature in the 70-90 • C region can be attributed to the dominance of the density effect.…”
Section: T G Value Determinationmentioning
confidence: 91%
“…Therefore, the influence of conformer changes can be avoided by studying this band. Since the peak area gives more accurate results, [25] the plot of relative peak area A/A 90 • C vs. temperature for 2847 cm −1 band is shown in Fig. 1(a), where A is the peak area for each temperature, and A 90 • C is the peak area for 90 • C. The heat capacity of aPS at various temperatures, calculated from DSC step-scan result, is depicted in Fig.…”
Section: T G Value Determinationmentioning
confidence: 99%