The use of reduced pressure to expand the capabilities of TGA–FTIR

Jackson, Richard S.; Rager, Albrecht

doi:10.1016/s0040-6031(00)00694-8

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…The C–Cl bond in the PVC structure has lower bond energy compared to those of the C–C and C–H bonds. Thus, once the PVC is pyrolyzed, the C–Cl bonds will be given priority to break, which will lead to the release of hydrogen chloride. , A group of absorption peaks in the 3100–2600 cm –1 region are found, which are ascribed to asymmetrical stretching of H–Cl . Moreover, when the temperature is at the highest loss rate of the first stage, the intensity of the absorption peak reaches its maximum.…”

Section: Resultsmentioning

confidence: 99%

“…29,30 A group of absorption peaks in the 3100−2600 cm −1 region are found, which are ascribed to asymmetrical stretching of H−Cl. 31 Moreover, when the temperature is at the highest loss rate of the first stage, the intensity of the absorption peak reaches its maximum. It is clear that the intensities of hydrogen chloride and other gaseous products in the IR spectra are apparently reduced at ∼400 °C, which indicates that the hydrogen chloride has been completely removed and char begins to form.…”

Section: Methodsmentioning

confidence: 99%

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Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

et al. 2018

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The catalytic effects of CuAl layered double hydroxide (CuAl-LDH) on dechlorination and carbonization of polyvinyl chloride (PVC) during pyrolysis were investigated. The thermal degradation and combustion behaviors were researched via thermogravimetric analysis (TGA) and cone calorimetry (CONE). The released gases were evaluated in detail by thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TGA-FTIR). Subsequently, elemental analysis and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) were employed to fully characterize the solid residues. The results of TGA and CONE showed that the addition of CuAl-LDH brought about the PVC degradation earlier and the char residues increase significantly. Moreover, the results of TGA-FTIR, elemental analysis, SEM-EDS, and Raman analysis revealed that the existence of CuAl-LDH accelerated the dehydrochlorination and promoted the char formation of PVC. CuAl-LDH maybe a potential catalyst applied to treat PVC waste into carbon materials to realize material and chemical recycling, which possess tremendous environmental and economic benefits.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

et al. 2018

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“…The glycerol decomposition (peak) temperature was previously detected at ca. 245 °C while using a higher heating ramp (15 K/min) (Jackson & Rager, 2001). With the inclusion of water, the 9:1 (wt/wt) glycerol:water solution and the 3:7 (wt/wt) glycerol:water solution had a prominent peak from ca.…”

Section: Tgamentioning

confidence: 99%

Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol

Zhang

Xie

Zhang

et al. 2016

Carbohydrate Polymers

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The focus of this study was on the effects of plasticisers (the ionic liquid 1-ethyl-3-methylimidazolium acetate, or [Emim][OAc]; and glycerol) on the changes of starch structure on multiple length scales, and the variation in properties of plasticised starch-based films, during ageing. The films were prepared by a simple melt compression moulding process, followed by storage at different relative humidity (RH) environments. Compared with glycerol, [Emim][OAc] could result in greater homogeneity in [Emim][OAc]-plasticised starch-based films (no gel-like aggregates and less molecular order (crystallites) on the nano-scale). Besides, much weaker starch-starch interactions but stronger starch-[Emim][OAc] interactions at the molecular level led to reduced strength and stiffness but increased flexibility of the films. More importantly, [Emim][OAc] (especially at high content) was revealed to more effectively maintain the plasticised state during ageing than glycerol: the densification (especially in the amorphous regions) was suppressed; and the structural characteristics especially on the nano-scale were stabilised (especially at a high RH), presumably due to the suppressed starch molecular interactions by [Emim][OAc] as confirmed by Raman spectroscopy. Such behaviour contributed to stabilised mechanical properties. Nonetheless, the crystallinity and thermal stability of starch-based films with both plasticisers were much less affected by ageing and moisture uptake during storage (42 days), but mostly depended on the plasticiser type and content. As starch is a typical semi-crystalline bio-polymer containing abundant hydroxyl groups and strong hydrogen bonding, the findings here could also be significant in creating materials from other similar biopolymers with tailored sensitivity and properties to the environment.

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“…A closer look on the experimental conditions applied in the various reported TA-FTIR studies indicates that in certain cases the conditions deviate significantly from the optimal settings for quantification of FTIR traces. Some experimental conditions used for TA-FTIR investigations are listed in Table 1 [4,6,[14][15][16][17][18][19][20][21][22]. Comparison of acquisition time and residence time describes the precision and completeness of the recorded traces: values of this ratio below or equal one indicate a big likelihood that each molecule could be detected and contributed to the integral intensity of recorded traces.…”

Section: Abstract: Calibration Techniques Hyphenated Techniques Pulmentioning

confidence: 99%

Influence of measuring conditions on the quantification of spectroscopic signals in TA-FTIR-MS systems

Eigenmann¹,

Maciejewski²,

Baiker³

2006

J Therm Anal Calorim

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The use of reduced pressure to expand the capabilities of TGA–FTIR

Cited by 9 publications

References 7 publications

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol

Influence of measuring conditions on the quantification of spectroscopic signals in TA-FTIR-MS systems

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