“…The infrared spectrum of untreated and alkali-treated MPPS/PTFE sewing threads is shown in Figure 9. After treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h, it could be found that the stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread 41–43 had changed little, which were the bands at 3086, 1470 and 1386 cm –l , respectively. It was observed that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h. Figure 9.Fourier transform infrared spectrum of (a) modified polyphenylene sulfide and polytetrafluoroethylene (MPPS/PTFE) sewing thread before and after treatment with NaOH solution when the temperature was 25℃: (b), (c), (d) locally enlarged views.…”
Section: Resultsmentioning
confidence: 99%
“…After treatment with NaOH solution at a temperature of 85℃, the infrared spectrum of MPPS/PTFE sewing thread was as shown in Figure 10. The stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread 41–43 had changed little, which were the bands at 3086, 1636 and 1391 cm –l , respectively. So, it could be concluded that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 85℃.…”
Section: Resultsmentioning
confidence: 99%
“…After treatment with NaOH solution at a temperature of 85 C, the infrared spectrum of MPPS/PTFE sewing thread was as shown in Figure 10. The stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread [41][42][43] had changed little, which were the bands at 3086, 1636 and 1391 cm -l , respectively. So, it could be concluded that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 85 C. The FTIR spectrum of alkali-treated MPPS/PTFE sewing thread was almost the same as that of untreated MPPS/PTFE sewing thread at the concentration of 2 mol/L, temperature of 85 C and treatment time of 2 h. This indicated that MPPS/ PTFE sewing thread was almost undamaged in this condition.…”
Section: Corrosion Mechanism Of Naoh Solution On Mpps/ptfe Sewing Threadmentioning
The alkali resistance of sewing thread made of modified polyphenylene sulfide and polytetrafluoroethylene (MPPS/PTFE) has a crucial influence when used in the field of filtering high-temperature dusty gas. Therefore, the effects of alkali (NaOH) solution on the properties of MPPS/PTFE sewing thread at different temperatures, different concentrations and different times were studied. The results showed that white particulate matter and bump materials appeared on the surface of MPPS fibers in the MPPS/PTFE sewing thread. The maximum strength loss of MPPS/PTFE sewing thread was around 12.9% and the maximum deviation of elongation at break was about 4.5% after treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h. By analysis, it could be concluded that the structure of the benzene ring skeleton of the macromolecular chain in the MPPS/PTFE sewing thread did not change after treatment with NaOH solution, but the C-S bonds attached to the benzene ring in the MPPS/PTFE sewing thread had rotated, or even broken, which could be confirmed by the curves of Fourier transform infrared spectroscopy. The thermal stability of MPPS/PTFE sewing thread was decreased after treatment with NaOH solution, which was caused by surface damage of MPPS fibers in the MPPS/PTFE sewing thread.
“…The infrared spectrum of untreated and alkali-treated MPPS/PTFE sewing threads is shown in Figure 9. After treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h, it could be found that the stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread 41–43 had changed little, which were the bands at 3086, 1470 and 1386 cm –l , respectively. It was observed that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h. Figure 9.Fourier transform infrared spectrum of (a) modified polyphenylene sulfide and polytetrafluoroethylene (MPPS/PTFE) sewing thread before and after treatment with NaOH solution when the temperature was 25℃: (b), (c), (d) locally enlarged views.…”
Section: Resultsmentioning
confidence: 99%
“…After treatment with NaOH solution at a temperature of 85℃, the infrared spectrum of MPPS/PTFE sewing thread was as shown in Figure 10. The stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread 41–43 had changed little, which were the bands at 3086, 1636 and 1391 cm –l , respectively. So, it could be concluded that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 85℃.…”
Section: Resultsmentioning
confidence: 99%
“…After treatment with NaOH solution at a temperature of 85 C, the infrared spectrum of MPPS/PTFE sewing thread was as shown in Figure 10. The stretching vibration peaks of the benzene ring skeleton of MPPS/PTFE sewing thread [41][42][43] had changed little, which were the bands at 3086, 1636 and 1391 cm -l , respectively. So, it could be concluded that the main structure of MPPS/PTFE sewing thread was not damaged after treatment with NaOH solution at a temperature of 85 C. The FTIR spectrum of alkali-treated MPPS/PTFE sewing thread was almost the same as that of untreated MPPS/PTFE sewing thread at the concentration of 2 mol/L, temperature of 85 C and treatment time of 2 h. This indicated that MPPS/ PTFE sewing thread was almost undamaged in this condition.…”
Section: Corrosion Mechanism Of Naoh Solution On Mpps/ptfe Sewing Threadmentioning
The alkali resistance of sewing thread made of modified polyphenylene sulfide and polytetrafluoroethylene (MPPS/PTFE) has a crucial influence when used in the field of filtering high-temperature dusty gas. Therefore, the effects of alkali (NaOH) solution on the properties of MPPS/PTFE sewing thread at different temperatures, different concentrations and different times were studied. The results showed that white particulate matter and bump materials appeared on the surface of MPPS fibers in the MPPS/PTFE sewing thread. The maximum strength loss of MPPS/PTFE sewing thread was around 12.9% and the maximum deviation of elongation at break was about 4.5% after treatment with NaOH solution at a temperature of 25℃ and a concentration of 2 mol/L for 120 h. By analysis, it could be concluded that the structure of the benzene ring skeleton of the macromolecular chain in the MPPS/PTFE sewing thread did not change after treatment with NaOH solution, but the C-S bonds attached to the benzene ring in the MPPS/PTFE sewing thread had rotated, or even broken, which could be confirmed by the curves of Fourier transform infrared spectroscopy. The thermal stability of MPPS/PTFE sewing thread was decreased after treatment with NaOH solution, which was caused by surface damage of MPPS fibers in the MPPS/PTFE sewing thread.
“…[14,15,17,18] This TGA-FTIR analysis below gives practical guidance to the wide usage of PPS composites. [19][20][21][22][23][24][25][26][27] Figure 10 depicts the temperature-dependent TGA-FTIR curves with the applied thermal treatment by heating in inert atmosphere up to 850 C, which result into three mass loss steps of −9.3, −31.2, and −3.7% with peaks in the DTG curve (mass loss rate) at 474.3, 554.2, and 952.5 C. The Gram-Schmidt curve displays the overall IR intensities and behaves as a mirror image of the mass loss rate (DTG) and shows maximum intensities during mass loss steps.…”
Section: Analysis Of Thermal Pyrolysis Products By Tga-ftir Techniquementioning
In this study, virgin and thermal aged PPS samples were prepared and tested using different techniques such as thermogravimetric analysis (TGA), coupled TGA-Fourier transform infrared spectroscopy (FTIR), and FTIR as well as optical microscopy. Some interesting research results can be summarized as follows: TGA results prove the PPS composite samples aged at 180 and 200 C have been degraded obviously during the aging period in oven. Moreover, accelerated aging leads to the degradation of PPS composite with the observation of increased thermal oxidation layer from outside to inside. There is a plateau standing at about 350 μm for the thermal oxidation layer at oxidation temperature of 200 C. Some thermal decomposition models are applied to clarify the degradation kinetics of PPS composite. According to the activation energy value, it appears degradation more easily at the beginning of the heating process in the atmosphere of oxygen than that of nitrogen. Moreover, the related products of PPS composites during pyrolysis are fully discussed with the combined analysis of TGA-FTIR techniques.
“…The correlation coefficients (R 2 ) obtained by both Friedman and KAS methods were approximately 0.99 within this range. Therefore, it implies that both methods could be used to investigate the kinetics of this decomposition stage [32]. The values of activation energy computed by Friedman and KAS methods at α=0.3 were 468.6 and 446.4 kJ•mol -1 respectively.…”
Section: Evaluation Of Activation Energymentioning
Wool (WO) is often blended with polyamide 6.6(PA) at certain ratios in order to obtain fabrics with superior comfort and mechanical features. This type of wool rich upholstery fabrics are commonly preferred in aircraft seats. Flammability is an important characteristic of aircraft materials in terms of safety and regulatory purposes and it is highly dependent on the composition of blends. Since WO/PA blended fabrics cannot meet the flammability requirements, they are used in aircraft after flame retardant finishing. Needs for innovative new flame retardant chemicals for wool and wool blended fabrics are continuing. This study aims to present a comprehensive investigation and understanding of the fire and thermal degradation behaviour of 100% WO and wool rich blends (88.6% WO/11.4% PA and 78.5% WO/21.5% PA). The data obtained in this work can be used to identify the effect of polyamide 6.6 on the flammability of the wool and to develop new flame retardant chemicals for WO/PA blended fabrics. According to the results, the peak of heat release rate of 100% WO increased about 25% when blended with 21.5% PA as measured by the cone calorimeter and decreased about 12% as measured by the micro-scale combustion calorimeter. This is because the decomposition steps of the two materials are different. Regardless of the equipment used for measurements, the total heat release during combustion increased with the increasing PA ratios in blends. The thermal analyses were performed to study various stages occurred during thermo-oxidative decomposition of wool and its blends. The thermal degradation of PA could be observed as a separate stage during decomposition. On the other hand, the kinetics of thermal decomposition, even during the early stages of decomposition was modified for the blended fabrics. The results will contribute to the understanding of the effect of polyamide ratio on the flammability of the wool.
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