Synthesis of organo-silicon block copolymers by hetero-functional polycondensation

Андрианов, К. А.; Tsvetkov, V.N.; Tsvankin, D.Ya.; Nogaideli, A. I.; Макарова, Н. Н.; Mukbaniani, O.; Vitovskaya, M.G.; Genin, Ya.V.; Kolbina, G. F.

doi:10.1016/0032-3950(76)90155-6

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…In nitrogen, thermal degradation was completed in less than an hour, and the insoluble black char remained after 48 h at 900 °C and was stable to 1100 °C when switched to air. 225 Lewicki et al in 2012 78,205 studied the thermal degradation behavior by changing the structural architecture of PDMS systems (monomodality and bimodality, a range of crosslink density, interchain molar mass, and percentage of free chain ends concerning the thermal degradation). In general, they found that all the PDMS systems degrade in the same pattern by TGA, giving many D 3 cyclic forms.…”

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

confidence: 99%

“…1(c)). 11,[64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] The multicomponent 3D network system is designed using additives, filler materials and catalysts, with initial polymer structure and its functionality also crucial for final properties. For instance, if the network structure is different in the same PDMS system, the formation of the cyclic distribution after the depolymerization will also be significantly altered.…”

Section: Introductionmentioning

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%

Section: Introductionmentioning

confidence: 99%

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

Rupasinghe

Furgal

2021

Polymer International

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“…There is information about siliconorganic BCs with a cyclolinear structure of the macromolecules. From A m B n type cyclolinear siliconorganic BCs there are known poly‐1,3‐disila‐1,3‐diphenyl‐2‐oxaindane fragments in the main DMS chain,4 ladder polyphenyl‐silsesquioxanes with single‐ and double‐stranded DMS fragments in the main chain,5–8 polycyclotetrasiloxane–DMS BCs,9 and disilaoxaindane–DMS BCs 10. From (AB) m C n type BCs there are known silarylenecyclotetra(hexa)siloxane–DMS BCs 11, 12.…”

Section: Introductionmentioning

confidence: 99%

Poly(1,3‐disila‐1,3‐diphenyl‐2‐oxaindane)‐diphenylsiloxane‐poly(dimethylsiloxane) block copolymers

Mukbaniani

Matsaberidze

Achelashvili

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:The heterofunctional condensation of 1,3-dichloro-1,3-disila-1,3-diphenyl-2-oxaindane with dihydroxydiphenylsilane at various ratios of initial compounds in the presence of amines was carried out, and ␣,-dihydroxy(1,3-disila-1,3-diphenyl-2-oxaindane)-diphenylsiloxane oligomers with various degrees of condensation were obtained. Corresponding block copolymers were obtained by heterofunctional polycondensation of synthesized ␣,-dihydroxy(1,3-disila-1,3-diphenyl-2-oxaindane)-diphenylsiloxane oligomers with ␣,-dichlorodimethylsiloxanes in the presence of amines. Thermogravimetry, gel permeation chromatography, differential scanning calorimetry, and wide-angle X-ray analysis were carried out on the synthesized block coplymers. Differential scanning calorimetry and wide-angle X-ray studies of these copolymers showed that their properties were determined by the ratio of the lengths of the flexible linear poly(dimethylsiloxane) and rigid poly(1,3-disila-1,3-diphenyl-2-oxaindane)-diphenylsiloxane fragments in the main macromolecular chain. Two-phase systems were obtained with specific flexible and rigid fragment length values in synthesized block copolymers.

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