The structure and the properties of polydimethylsiloxanes with heptamethylcyclotetrasiloxenylethyl end groups

Андрианов, К. А.; Lavygin, I. A.; Ditsent, V.Ye.; Kotov, V. M.; Pryakhina, T. A.; Zolotareva, M.N.; Terent'eva, N. A.

doi:10.1016/0032-3950(77)90152-6

Cited by 2 publications

(2 citation statements)

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“…crosslink density, modality, inter‐crosslink chain length, the chemical substitution of the polymer backbone, degree of free chain ends, the active chain ends (residual catalysts). Filler type/level are the main characteristics of the structural architecture, and oxidative (or reductive) atmospheres also define the degradation rate 24,80,132,135,139,199–209 . It is noted that polysiloxane types –Si–R–(Si–O) x – where the R end group is a phenyl are more thermally stable than when R is an aliphatic group (Fig.…”

Section: Thermal Degradation and Radical Scission Reactions Over 350 °Cmentioning

confidence: 99%

“…Filler type/level are the main characteristics of the structural architecture, and oxidative (or reductive) atmospheres also define the degradation rate. 24,80,132,135,139,[199][200][201][202][203][204][205][206][207][208][209] It is noted that polysiloxane types -Si-R-(Si-O) xwhere the R end group is a phenyl are more thermally stable than when R is an aliphatic group (Fig. 5).…”

Section: Thermal Degradation and Radical Scission Reactions Over 350 °Cmentioning

confidence: 99%

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Degradation of silicone‐based materials as a driving force for recyclability

Rupasinghe

Furgal

2021

Polymer International

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Siloxane polymers are an important industrial commodity based on the structure –(R2–Si–O)–. Scission of the siloxane bond is essential, as it is the first step leading to polymerization or the depolymerization of polymers into smaller units for potential recycling. These highly condition‐specific reactions selectively trigger whether polymerization or breakdowns occur and have been extensively studied over the past 80 years. However, studies to recycle siloxanes are still in their infancy. Traditional methods to synthesize silicones involve high capital‐intensive and environmental costs using carbothermal reduction. These reactions cause the excessive release of global warming gases such as CO2 and other pollutants into the environment. Therefore, being able to reuse and recycle them in a meaningful manner is highly sought. As a result, ways to controllably rupture the siloxane bond into known products have been a goal of siloxane researchers since the 1950s. Hydrolysis, catalytic depolymerization, thermal depolymerization and radical extractions are the main approaches to imbue the scission of the siloxane bond, resulting in a slew of products, including new polymers, cyclics or monomeric silanes. The present review summarizes the available published data on the degradation and depolymerization of polysiloxanes published up to July 2021. © 2021 Society of Industrial Chemistry.

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Section: Thermal Degradation and Radical Scission Reactions Over 350 °Cmentioning

confidence: 99%