Observations of charge on nascent poly(vinyl chloride) particles in monomer

Wilson, J.C.; Zichy, E.L.

doi:10.1016/0032-3861(79)90234-9

Cited by 24 publications

(4 citation statements)

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“…This results in a tremendous acceleration of the reaction rate due to an uncontrolled decomposition of the peroxide. A possible explanation would be that, since PVC particles are considered negatively charged, an interaction can occur with the early generated Fc + , which remains trapped within these particles [41]. This phenomenon fades as the conversion increases and, when the free liquid monomer is sufficiently consumed, water begins to penetrate the PVC particles, allowing AA to contact Fc + at the PVC/water interface resulting in an abrupt activation (see Fig.…”

Section: Vinyl Chloride Polymerizationmentioning

confidence: 99%

Ferrocene/ferrocenium redox shuttling: Peroxide decomposition catalysis applied to vinyl monomers polymerization under suspension conditions

Zouhri¹,

Berthé²,

Bonnet

et al. 2022

Polymer

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Section: Vinyl Chloride Polymerizationmentioning

confidence: 99%

Ferrocene/ferrocenium redox shuttling: Peroxide decomposition catalysis applied to vinyl monomers polymerization under suspension conditions

Zouhri¹,

Berthé²,

Bonnet

et al. 2022

Polymer

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“…It has been shown beyond reasonable doubt that the colloid stability of primary particles arises from electrostatic charges (12,4,8).…”

Section: Discussionmentioning

confidence: 98%

The life-cycle of the two phase system in vinyl chloride polymerisation

Rance¹,

Zichy²

1981

Pure and Applied Chemistry

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Photon correlation spectroscopy (PCS) was used to obtain information on the state of the two phase system following phase separation in the very early stages of vinyl chloride polymerisation.Around a gel phase volume ratio of 103 the particle number appeared constant with the particles growing at constant rate until a sudden decrease in numbers set in at a certain particle size, indicating flocculation. A simple mathematical model is given to account for the observations. From this work and earlier studies a scheme is proposed for the complete life-cycle of the two phase system.

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“…From zeta potential measurements, the primary particle potentials were found to vary from −80 to −120 mV. [ 16,37,48 ]…”

Section: Calculation Of Suspension Viscositymentioning

confidence: 99%

“…From zeta potential measurements, the primary particle potentials were found to vary from À80 to À120 mV. [16,37,48] In Figure 1, the effects of polymer volume fraction, φ p , and particle charge parameter, p, on the viscosity of the polymerizing disperse monomer droplets during the early stages of polymerization are depicted. It can be seen that as the value of φ p increases, the viscosity of the polymerizing monomer droplets exhibits a sharp increase.…”

Section: Viscosity Of Polymerizing Monomer Dropletsmentioning

confidence: 99%

On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

Kiparissides

Pladis

2021

Can J Chem Eng

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The role of primary and secondary stabilizers in the suspension polymerization of VCM and their effect on grain morphology (i.e., particle size distribution, grain porosity, and bulk density) is critically discussed. Using the modified Mooney equation, the time‐varying viscosity of the suspension in an SPVC reactor is calculated in terms of the volume fraction of the dispersed monomer/polymer phase, the ratio of the viscosity of the dispersed phase over the viscosity of the continuous aqueous phase, and the maximum packing volume fraction of SPVC grains. A population balance equation is numerically solved to calculate the dynamic evolution of particle size distribution (PSD) in an industrial batch suspension VCM polymerization reactor. A porosity model is postulated to calculate the dynamic evolution of the PVC grain porosity with respect to monomer conversion and the extent of primary particle fusion. Finally, the underlying theory regarding the calculation of the required agitation power in SPVC reactors is detailed. It is shown that the time‐varying viscosity of the suspension can be calculated and the PVC grain morphology (i.e., extent of particle agglomeration) can be accessed via the on‐line estimation of the effective volume fraction of the dispersed phase using on‐line power agitation measurements obtained from an industrial‐scale SPVC reactor.

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Observations of charge on nascent poly(vinyl chloride) particles in monomer

Cited by 24 publications

References 0 publications

Ferrocene/ferrocenium redox shuttling: Peroxide decomposition catalysis applied to vinyl monomers polymerization under suspension conditions

Ferrocene/ferrocenium redox shuttling: Peroxide decomposition catalysis applied to vinyl monomers polymerization under suspension conditions

The life-cycle of the two phase system in vinyl chloride polymerisation

On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

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