Characteristic Effects in Degradation and Stabilization of Halogen-Containing Polymers

Минскер, К. С.

doi:10.1080/00914039408028568

Cited by 8 publications

(2 citation statements)

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“…The relatively low thermal stability of PVC has been attributed by many researchers to the presence of thermally labile structural segments or defects that are responsible of this instability. Among those defects, the most important ones are structural defects such as branching, tertiary chlorine, unsaturations, oxygen containing groups, head-to-head structures and polymerization residues [14,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Due to the importance of defects from the point of view of the thermal degradation of PVC, several articles deal with the formation of these defects in PVC macromolecules [18,31,33].…”

Section: Introductionmentioning

confidence: 99%

Kinetic model for thermal dehydrochlorination of poly(vinyl chloride)

Jiménez

Criado

Diánez

et al. 2010

Polymer

174

120

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In this paper, a novel method for calculating degradation kinetics is presented. The method has been applied to the thermal dehydrochlorination of two different samples of PVC. It has been observed that this dehydrochlorination is complex and involves two different processes. A model that accounts for the entire dehydrochlorination is proposed. This model involves nucleation and growth and diffusion controlled mechanisms. The kinetic parameters are obtained from linear heating rate, isothermal and sample controlled thermal analysis experiments. Kinetic results obtained from the macroscopic thermal analysis measurements demonstrate the correlation between the kinetics of the thermal dehydrochlorination of PVC and the structure of this macromolecule.

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Section: Introductionmentioning

confidence: 99%

Kinetic model for thermal dehydrochlorination of poly(vinyl chloride)

Jiménez

Criado

Diánez

et al. 2010

Polymer

174

120

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“…The mechanism of thermal degradation of PVC is shown in Scheme 4. 105 The presences of thermally labile segments and defects in polymeric chains, 106,107 random allylic chlorine atoms or tertiary chlorine atoms, 108,109 partial oxidation of PVC resulting in the formation of ketoallylic chlorine atoms, 110 internal double bonds, 111 and head-to-head structures 112 were proposed for high instability of PVC.…”

Section: Polypropylene (Pp)mentioning

confidence: 99%

Thermochemical Recycling of Waste Plastics by Pyrolysis: A Review

et al. 2021

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The increasing demand for plastics for their widespread applications has ultimately resulted in accumulation of substantial plastic waste, which remains a concern due to limited efforts, inadequacy, and environmental distresses of conventional techniques for waste plastics remediation. The enhanced production of raw materials for polymer syntheses has a dual impact on our ecosystem by causing rapid depletion of nonrenewable petroleum resources and waste generation. To address this situation, researchers have adopted advanced thermochemical recycling processes to produce intermediate products of the petrochemical industries including monomers, fuels, and other value-added products. Such practices can potentially serve the purpose of a circular economy. This review aims to cover the recent highlights in the field of waste plastics pyrolysis including critical observations from the past to provide precise understanding. Consequently, the reactivities and product distributions for plastic feeds, pyrolysis reactors, roles of catalysts, and effects of operating parameters on reactivity and selectivity have been covered. Coprocessing of plastic waste with radioactive materials, biomass, and heavy petroleum residue is also discussed. Furthermore, an overview on kinetics and mechanistic aspects of plastic pyrolysis is presented with a discussion on relevant analytical techniques. The applications of pyrolysis oil as a fuel or fuel additive are comprised in a separate section. Lastly, comparisons of existing chemical recycling technologies, summaries of commercial operations, and future projections are provided.

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