Déhydrochloruration du PCV en utilisant une correction pour des conditions isothermes

Vymazal, Z.; Czakó, Erzsébet; Meissner, Bernhard; Štěpek, J.

doi:10.1002/app.1974.070180927

Cited by 74 publications

(27 citation statements)

References 1 publication

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“…Evaluation of the stabilizing efficiency was carried out by measuring the rate of dehydrochlorination by a continuous potentiometric determination of the hydrogen chloride evolved at 1808C in air. A detailed description of this method was given by Vymazal et al [24].…”

Section: Methods Of Measurementmentioning

confidence: 99%

Inhibition of the thermal degradation of rigid poly(vinyl chloride) by dienophilic compounds

Abdel‐Naby

Al-Dossary

2008

Vinyl Additive Technology

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N-(N 0 -Arylamino)maleimide derivatives N-(N 0 -RPh)AMI (R 5 H, 2-NO 2 , 4-NO 2 , 2,4-di-NO 2 ) were investigated as organic thermal stabilizers and costabilizers for rigid poly(vinyl chloride) (PVC) at 1808C in air. Their stabilizing efficiencies were evaluated by measuring the induction period (T s , the period during which no evolved hydrogen chloride could be detected) and the dehydrochlorination rate as measured by continuous potentiometric determination, as well as the extent of discoloration. The stabilizing efficiencies were compared with those of some industrially used stabilizers. The results clearly revealed the greater efficiency of all of the investigated derivatives except the unsubstituted N-(N 0 -Ph)AMI, which was found to possess efficiency comparable with those of the reference stabilizers. The dinitro aminomaleimide [2,4-di(NO 2 )AMI] exhibited the highest efficiency. The stabilizing efficiencies of the AMIs are attributed to the replacement of the labile chlorine atoms on the PVC chains by more thermally stable stabilizer moieties. An ionic mechanism is proposed that explains the stabilizing action. Mixing the investigated stabilizers with cyanoguanidine, which is known to act as an HCl absorber, led to a true synergistic effect. The effect of the degradation process of adding small amounts of K 2 CO 3 to PVC stabilized with the materials under investigation also is discussed.

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Section: Methods Of Measurementmentioning

confidence: 99%

Inhibition of the thermal degradation of rigid poly(vinyl chloride) by dienophilic compounds

Abdel‐Naby

Al-Dossary

2008

Vinyl Additive Technology

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“…A detailed description of this method is given elsewhere. 33 A digital pH-meter (potentiometer) of the type CG-822 (Schott Grade GmbH, Germany) was used. It was connected to a silver electrode and a saturated calomel reference electrode for the potentiometric measurements.…”

Section: Methods Of Evaluation Of the Stabilizing Efficiencymentioning

confidence: 99%

Thermal degradation behavior of poly(vinyl chloride) in the presence of poly(glycidyl methacrylate)

Sabaa

Farag

Mohamed

2008

J of Applied Polymer Sci

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ABSTRACT:The thermal degradation behavior of poly (vinyl chloride) (PVC) in presence of poly(glycidyl methacrylate) (PGMA) has been studied using continuous potentiometric determination of the evolved HCl gas from the degradation process from one hand and by evaluating the extent of discoloration of the degraded samples from the other. The efficiency of blending PGMA with dibasic lead carbonate (DBLC) conventional thermal stabilizer has also been investigated. A probable radical mechanism for the effect of PGMA on the thermal stabilization of PVC has been suggested based on data reported by FTIR and elemental analyses.

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“…A detailed description of this method is given elsewhere. 28 A digital pH-meter (potentiometer) of the type CG 822 (Schott Grade GmbH, Germany) was used. It was connected to a silver electrode and a saturated calomel reference electrode for the potentiometric measurements.…”

Section: Methods Of Evaluation Of the Stabilizing Efficiencymentioning

confidence: 99%

Thermal degradation behavior of poly(vinyl chloride) in presence of poly(N‐acryloyl‐N′‐cyanoacetohydrazide)

Mohamed

Farag

Sabaa

2008

J of Applied Polymer Sci

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ABSTRACT:The thermal degradation behavior of poly (vinyl chloride), PVC, in presence of poly(N-acryloyl-N 0 -cyanoacetohydrazide), PACAH, has been studied using continuous potentiometric determination of the evolved HCl gas from the degradation process from one hand and by measuring the extent of discoloration of the degraded samples from the other. The efficiency of blending PACAH with dibasic lead carbonate, DBLC, conventional thermal stabilizer has also been investigated. A probable radical mechanism for the effect of PACAH on the thermal stabilization of PVC has been proposed.

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Déhydrochloruration du PCV en utilisant une correction pour des conditions isothermes

Cited by 74 publications

References 1 publication

Inhibition of the thermal degradation of rigid poly(vinyl chloride) by dienophilic compounds

Inhibition of the thermal degradation of rigid poly(vinyl chloride) by dienophilic compounds

Thermal degradation behavior of poly(vinyl chloride) in the presence of poly(glycidyl methacrylate)

Thermal degradation behavior of poly(vinyl chloride) in presence of poly(N‐acryloyl‐N′‐cyanoacetohydrazide)

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