FTIR spectroscopic characterization of structural changes in polyamide-6 fibers during annealing and drawing

Vasanthan, Nadarajah; Salem, David R.

doi:10.1002/1099-0488(20010301)39:5<536::aid-polb1027>3.0.co;2-8

Cited by 181 publications

(152 citation statements)

References 17 publications

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“…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.…”

Section: Choice Of the Raman Probessupporting

confidence: 73%

“…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].…”

Section: Choice Of the Raman Probesmentioning

confidence: 94%

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

Colomban

Ramirez

Paquin

et al. 2006

Engineering Fracture Mechanics

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Section: Choice Of the Raman Probessupporting

confidence: 73%

Section: Choice Of the Raman Probesmentioning

confidence: 94%

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

Colomban

Ramirez

Paquin

et al. 2006

Engineering Fracture Mechanics

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“…The a-structure should give the absorbance at 1200 and 930 cm -1 , and the c-crystalline phase at 973 cm -1 [27]. On the spectra shown in Fig.…”

Section: Thermomechanical Characterizationmentioning

confidence: 99%

“…1190 cm -1 ; however, its intensity for PA 6.10 is lower than for the other materials. Interestingly, a new band at 1179 cm -1 appears for PA 6.10, which is also related to the crystalline domain, but it was found as non-dependent on the crystallinity [27]. This band was also observed for PA 10.10 and 10.12, but at slightly lower frequency of 1165 cm -1 .…”

Section: Thermomechanical Characterizationmentioning

confidence: 99%

Bio-polyamides based on renewable raw materials

Pagacz

Raftopoulos

Leszczyńska

et al. 2015

J Therm Anal Calorim

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Structural characterization of a series of novel bio-polyamides based on renewable raw materials-PA 4.10, PA 6.10, PA 10.10, and PA 10.12-was performed by Fourier transform infrared spectroscopy (FTIR) and wideangle X-ray diffraction (WAXD). Infrared spectra and the WAXD patterns indicate the coexistence of different crystalline forms, a-and c-triclinic and b-pseudohexagonal. Thermal properties in the glass transition (T g ) and melting region were then investigated using temperaturemodulated DSC (TOPEM Ò DSC). The melting point (T m ) was found to increase with increasing amide/methylene ratio in the polymer backbone, which is consistent with the increase in linear density of hydrogen bonds. Studies on the molecular dynamics by dynamic mechanical analysis show three distinct regions associated with the c-and the b-relaxation and the dynamic glass transition. TOPEM Ò DSC data reveal that at low frequency/long timescales, the materials with significantly different amide/methylene ratios have similar segmental dynamics.

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“…[21][22][23] The crystallinity was calculated to be 50% based on the densities of the amorphous and α-crystalline phases, 1.10 and 1.17 g cm -3 , respectively. 22 WAXD measurements were performed by transmission mode with a Rigaku Rotorflex RU-200B diffractometer using Ni-filtered CuKα radiation at 40 kV and 150 mA.…”

Section: Measurementsmentioning

confidence: 76%

Hydration in a new semiaromatic polyamide observed by humidity‐controlled dynamic viscoelastometry and X‐ray diffraction

Uddin

Gotoh

Ohkoshi

et al. 2005

J Polym Sci B Polym Phys

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Hydration in a new semiaromatic polyamide, named polyamide 9-T (PA9-T), a copolymer of terephthalic acid with n-and iso-nonanediamine, is studied by dynamic viscoelastic analysis under controlled humidity conditions and wide-angle x-ray diffraction analysis in comparison with common polyamide nylon 6. The storage modulus of PA9-T is retained at up to 60 ºC with increasing humidity, then dropping with further increases in temperature past 70 ºC. The decrease in mechanical properties at 70 ºC due to moisture uptake is found to be substantially improved by annealing to develop molecular packing and/or crystallization. In contrast, the storage modulus of very highly crystallized (50% crystallinity) nylon 6 decreases markedly with humidity at low temperatures such as 20 ºC. Thus, PA9-T retains its mechanical properties in humid atmospheres at much higher temperatures than nylon 6. The crystalline x-ray diffraction peaks for nylon 6 corresponding to (002) + (202) of α form shift upon absorption of moisture, speculated to be due to the weakening of hydrogen bonds and the subsequent conformational disordering of the chains. Unlike nylon 6, the crystalline peaks of PA9-T do not shift due to moisture uptake. This is considered to be attributable to that the long aliphatic chain in PA9-T forms the large hydrophobic domain, rendering PA9-T less hygroscopic than nylon 6. Additionally, strong hydrogen bonds formed by terephthalamide residues together with a strong stacking force of phenylene groups may also repel water, preventing moisture bind with the amide groups of PA9-T crystals.

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FTIR spectroscopic characterization of structural changes in polyamide-6 fibers during annealing and drawing

Cited by 181 publications

References 17 publications

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

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

Bio-polyamides based on renewable raw materials

Hydration in a new semiaromatic polyamide observed by humidity‐controlled dynamic viscoelastometry and X‐ray diffraction

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