Carboxyl-Containing Polydimethylsiloxanes: Synthesis and Properties

Gorodov, V. V.; Milenin, Sergey A.; Demchenko, Nataliya; Музафаров, А. М.

doi:10.32931/io2011r

Cited by 10 publications

(27 citation statements)

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“…The latter feature enables MQ copolymers to act as linking agents, provided that the functional groups of raw rubber are sufficiently reactive toward the silanol functions of MQ copolymers. Amino and carboxy substituents can serve as such agents prone to interaction with silanols; owing to the ease of incorporating them into the PDMS structure, the use of these compounds is very promising [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

et al. 2021

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Colorless transparent vulcanizates of silicone elastomers were prepared by mixing the components in a common solvent followed by solvent removal. We studied the correlation between the mechanical behavior of polydimethylsiloxane (PDMS)-rubber compositions prepared using MQ (mono-(M) and tetra-(Q) functional siloxane) copolymers with different ratios of M and Q parts as a molecular filler. The composition and molecular structure of the original rubber, MQ copolymers, and carboxyl-containing PDMS oligomers were also investigated. The simplicity of the preparation of the compositions, high strength and elongation at break, and their variability within a wide range allows us to consider silicone elastomers as a promising alternative to silicone materials prepared by traditional methods.

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Section: Introductionmentioning

confidence: 99%

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

et al. 2021

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“…All obtained cycles were characterized by 1 H and 29 Si nuclear magnetic resonance (NMR)-1,1,3,3,5,5,7-hexamethyl-7-vinylcyclotetrasiloxane . 1 H NMR, δ, ppm: 5.67-6.19 m (3H, ((CH2=CH)Si), 0.15 m (12H, Si(CH3)2).…”

Section: Methodsmentioning

confidence: 99%

“…1 H NMR, δ, ppm: 5.67-6.19 m (3H, ((CH2=CH)Si), 0.15 m (12H, Si(CH3)2). 29 Si NMR, δ ppm: −18.48 MTBE was rapidly added to the reaction mixture and cooled to −60 °C with vigorous stirring. The reaction mass was stirred until room temperature (for 1 h).…”

Section: Methodsmentioning

confidence: 99%

“…Cyclosiloxanes of mixed composition are of particular interest in modifying polydimethylsiloxane [ 24 , 25 , 26 , 27 ] to provide it with the required properties and to obtain a linear functional matrix containing reactive groups in the chain for further transformations and obtaining new polymers with a determined structure and a required set of characteristics [ 28 , 29 ]. Substituents of the silicon atom have a strong effect on the polymerization rate of cyclosiloxanes; as a result, it is difficult to obtain copolymers by polymerization of a mixture of cyclosiloxanes with different groups at the silicon level [ 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers

et al. 2021

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This paper reports a method for the synthesis of 1,1,3,3,5,5-hexamethyl-7,7-diorganocyclotetrasiloxanes by the interaction of 1,5-disodiumoxyhexamethylsiloxane with dichlorodiorganosilanes such as methyl-, methylvinyl-, methylphenyl-, diphenyl- and diethyl dichlorosilanes. Depending on the reaction conditions, the preparative yield of the target cyclotetrasiloxanes is 55–75%. Along with mixed cyclotetrasiloxanes, the proposed method leads to the formation of polymers with regular alternation of diorganosylil and dimethylsylil units. For example, in the case of dichlorodiethylsilane, 70% content of linear poly(diethyl)dimethylsiloxanes with regular alternation of units can be achieved in the reaction product. Using 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane as an example, the prospects of the mixed cycle in copolymer preparation in comparison with the copolymerization of octamethyl- and octaethylcyclotetrasiloxanes are shown.

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“…The field of application of grafted copolymers containing PiPrOx side chains can be expanded by using polydimethylsiloxane (PDMS) as a hydrophobic backbone. PDMS has good prospects for creating amphiphilic macromolecules [ 43 , 44 ]. Siloxane polymers have many unique properties, such as thermal and oxidation stability and flexibility over a wide temperature range, and are physiologically and biologically inert [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Molecular Brushes with Regular Polydimethylsiloxane Backbone and Poly-2-isopropyl-2-oxazoline Side Chains. 2. Self-Organization in Aqueous Solutions on Heating

et al. 2020

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The behavior of amphiphilic molecular brushes in aqueous solutions on heating was studied by light scattering and turbidimetry. The main chain of the graft copolymers was polydimethylsiloxane, and the side chains were thermosensitive poly-2-isopropyl-2-oxazoline. The studied samples differed in the length of the grafted chains (polymerization degrees were 14 and 30) and, accordingly, in the molar fraction of the hydrophobic backbone. The grafting density of both samples was 0.6. At low temperatures, macromolecules and aggregates, which formed due to the interaction of main chains, were observed in solutions. At moderate temperatures, heating solutions of the sample with short side chains led to aggregation due to dehydration of poly-2-isopropyl-2-oxazoline and the formation of intermolecular hydrogen bonds. In the case of the brush with long grafted chains, dehydration caused the formation of intramolecular hydrogen bonds and the compaction of molecules and aggregates. The lower critical solution temperature for solutions of the sample with long side chains was higher than LCST for the sample with short side chains. It was shown that the molar fraction of the hydrophobic component and the intramolecular density are the important factors determining the LCST behavior of amphiphilic molecular brushes in aqueous solutions.

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Carboxyl-Containing Polydimethylsiloxanes: Synthesis and Properties

Cited by 10 publications

References 0 publications

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

New Principles of Polymer Composite Preparation. MQ Copolymers as an Active Molecular Filler for Polydimethylsiloxane Rubbers

Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers

Amphiphilic Molecular Brushes with Regular Polydimethylsiloxane Backbone and Poly-2-isopropyl-2-oxazoline Side Chains. 2. Self-Organization in Aqueous Solutions on Heating

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