The application of Fourier transform Raman spectroscopy to the identification and characterization of polyamides—I. Single number nylons

Evaluation of the Structure and Acid–Base Properties of Bulk Wood by FT-Raman Spectroscopy

“…2 and 3) and are due to the skeletal vibration possibly also involving the C™O stretch (36). This assignment agrees well with previously published spectra by Koenig and Shih (37), Atalla and Agarwal (14), Wiley and Atalla (38), Goral and Zichy (16), and Hendra et al (39). The overlapping with cellulose and hemicellulose is reasonable since both are polysaccharides having similar structure (40).…”

Micro-Raman study of the fatigue and fracture behaviour of single PA66 fibres: Comparison with single PET and PP fibres

“…In the past, most Raman studies have concerned only the middle wavenumber range, the bending domain and stretching modes [18][19][20][21][22][23]. Information obtained from these modes is very local.…”

“…These low wavenumber collective modes may be preferred for the study of the relationship between the chain structure and the macroscopic mechanical behaviour. On the other hand, the assignments of bending and stretching modes are well documented, especially their relationship with conformational changes [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Note, local modes such as N-H stretching mode can also a good source of information about the modification of neighbouring chains arrangements [9][10][11]16,17].…”

Normal Modes and Their Dispersion in α Form of Nylon-6 (αNY6)

“…Final sets of constants are given in Table I. The assignments are made on the basis of potential energy distribution (PED), band profile, line intensities and the presence/absence of similar groups in an identical environment in addition to the information obtained from photo acoustic-Fourier transform infrared (PAFTIR-IR) 12 (1500-500 cm À1 ), Fourier transform Raman spectrum 7,8 (3500-500 cm À1 ), micro Raman confocal spectra 12 (3450-900 cm À1 ) and inelastic neutron spectra 9,10 (below 900 cm À1 ). The vibrational frequencies have been calculated for the values of ranging from 0 to in steps of 0:05.…”

“…We have calculated Amide A frequency at 3301 cm À1 corresponding to the observed peak at 3300 cm À1 in IRnRaman. [5][6][7][8] Amide I mode has significant contribution of C=O and C-N stretches. This localized mode is calculated at 1648 cm À1 corresponding to the observed band at 1647 cm À1 in Raman.…”