Study of Self-Diffusion of Silicone MQ Resins in Chloroform Solutions by Pulsed Field-Gradient NMR Spectroscopy

Васильев, С. Г.; Volkov, V. I.; Татаринова, Е. А.; Muzafarov, А. М.

doi:10.1007/s00723-013-0512-4

Cited by 11 publications

(7 citation statements)

References 26 publications

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“…The MQ copolymers with an M:Q ratio of 1:1.5 are most widely used. The versatility of these systems was taken for granted for a long time, and only new discoveries of the composite nature of this complex polymer system enabled their studies to be brought to the standard “structure—properties” paradigm [ 20 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. It was found that the properties of MQ copolymers are determined not only by the ratio of their units but also by the core—shell ratio in each individual macromolecule.…”

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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“…However, with the vinyl content of U‐VMQ increasing to 2.5 wt %, all the five ALSR specimens passed IPT at 4.5 kV, and the electrical erosion rate was the lowest. It was mainly attributed to the improvement of the thermal stability of ALSR caused by the concentrated crosslinking structure . When vinyl content further increased to 3.75 and 5.00 wt %, four specimens passed IPT at 4.5 kV and one failed, and the electrical erosion rate increased to 1.06 and 1.46 wt %, respectively.…”

Section: Resultsmentioning

confidence: 98%

“…In Figure (b), the peaks at 5.73 and 5.94 ppm, respectively, were assigned to the protons of ‐Si‐CH=CH 2 and ‐Si‐CH=CH 2 . The peaks at 1.22, 2.21, 3.20, 1.49, and 0.63 ppm were assigned to the protons of ‐CH(CH 3 ) 2 , ‐CH(CH 3 ) 2 , ‐NCONHCH 2 CH 2 CH 2 SiO 3/2 , ‐NCONHCH 2 CH 2 CH 2 SiO 3/2 , and ‐NCONHCH 2 CH 2 CH 2 SiO 3/2 , respectively . The proton peaks of ‐Si(CH 3 ) 3 and ‐CH 3 in and ‐Si (CH 3 ) 2 (CH 2 =CH) were observed in the range of 0–0.3 ppm.…”

Section: Resultsmentioning

confidence: 99%

Investigation of ureido‐attached vinyl MQ silicone resin on tracking and erosion resistance of addition‐cure liquid silicone rubber

Lai

et al. 2018

J of Applied Polymer Sci

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With the growing incidence of extreme climate and serious pollution, the capability to resist high-voltage arc discharge has been considered as one of crucial performances for silicone rubber in the field of electrical power. Herein, to enhance the tracking and erosion resistance of addition-cure liquid silicone rubber (ALSR), a kind of ureido-attached vinyl MQ silicone resin [hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q)] (U-VMQ) was synthesized. The chemical structure of U-VMQ was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the effects of U-VMQ on the mechanical properties, thermal stability, and tracking and erosion resistance of ALSR were investigated. The results showed that U-VMQ was beneficial for the improvement of mechanical properties and thermal stability of ALSR. With 2 phr of U-VMQ containing 2.5 wt % of vinyl content, the ALSR successfully passed the inclined plane tracking at 4.5 kV, and the electrical erosion rate was only 0.13%.

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“…However, transition between solutions with different concentrations was not typical for transitions of colloid-like particles [68]. …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

2017

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In this review, we discuss currently available studies on the synthesis and properties of MQ copolymers. The data on methods of producing hydrolytic and heterofunctional polycondensation of functional organosilanes as well as the obtaining MQ copolymers based on silicic acids and nature silicates are considered. The ratio of M and Q monomers and the production method determine the structure of MQ copolymers and, accordingly, their physicochemical characteristics. It is shown that the most successful synthetic approach is a polycondensation of organoalkoxysilanes in the medium of anhydrous acetic acid, which reduces the differences in reactivity of M and Q monomers and leads to obtaining a product with uniform composition in all fractions, with full absence of residual alkoxy-groups. The current concept of MQ copolymers is that of organo-inorganic hybrid systems with nanosized crosslinked inorganic regions limited by triorganosilyl groups and containing residual hydroxyl groups. The systems can be considered as a peculiar molecular composites consisting of separate parts that play the role of a polymer matrix, a plasticizer, and a nanosized filler.

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Study of Self-Diffusion of Silicone MQ Resins in Chloroform Solutions by Pulsed Field-Gradient NMR Spectroscopy

Cited by 11 publications

References 26 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

Investigation of ureido‐attached vinyl MQ silicone resin on tracking and erosion resistance of addition‐cure liquid silicone rubber

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

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