Synthesis of hyperbranched polymethylvinylborosiloxanes and modification of addition‐curable silicone with improved thermal stability

Liu, Lizhi; Zhao, Ji; Li, Hao; Zhao, Tong

doi:10.1002/aoc.3070

Cited by 17 publications

(4 citation statements)

References 26 publications

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“…However, studies on improving the functional polysiloxanes’ thermal stability by adjusting their molecular structure are still limited. , Take phenylpolysiloxane as an example; phenylpolysiloxanes with different molecular structures, especially the amount and distribution of subunits, will result in different thermal resistance properties. The molecular structures are affected by different raw materials and synthetic methods.…”

Section: Introductionmentioning

confidence: 99%

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Zhang

et al. 2017

Ind. Eng. Chem. Res.

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Restricted by their molecular structure defects, poly(methylphenylsiloxanes) usually exhibit a relatively low thermal stability, thus limiting their application in high-temperature areas. In this paper, we introduce a cost-effective synthesis method to prepare poly(methylphenylsiloxanes) (PPMS-M) with methyl–phenyl mixed cyclic monomers as raw materials. The molecular structure characterization shows that PPMS-M contain abundant phenyl groups, and the phenylsiloxane units are evenly distributed among methylsiloxane segments. The thermal degradation kinetics are systematically studied with the Flynn–Wall–Ozawa method. It shows that PPMS-M exhibits much higher degradation activation energy than ordinary poly(methylphenylsiloxanes) (PPMS-PD) does, which is prepared by 2,4,6-trimethyl-2,4,6-triphenylcyclotrisiloxane (P3) and octamethylcyclotetrasiloxane (D4). The thermogravimetry–Fourier transform infrared characterization shows that the degradation process of the phenyl group in PPMS-M occurs at temperatures of 100–200 °C higher than those for PPMS-PD. PPMS-M exhibits good thermal stability and a low glass transition temperature. Our method would be applied to cost-effective synthesis of other high-performance functional polysiloxanes.

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Section: Introductionmentioning

confidence: 99%

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Zhang

et al. 2017

Ind. Eng. Chem. Res.

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“…For epoxy materials, the epoxy groups of bifunctional BSiO Vi could addition reacted with amino or imino groups on the surface of materials. While the vinyl functional group of BSiO Vi molecules could participate in the hydrosilylation crosslinking reaction of SR [8,9] . Through bidirectional bonding reaction, the "bridge" chemical bond BSiO Vi molecule could connect the epoxy resin substrate and the SR showed in Figure 5.…”

Section: Analysis Of Bonding Mechanismmentioning

confidence: 99%

Bonding Technology of Silicon rubber protective materials

Zhang,

Wang,

Xiao

et al. 2023

J. Phys.: Conf. Ser.

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Silicone rubber (SR) materials play a crucial role in the field of mechanical impact protection technology. However, the adhesive stability between SR and various substrates in the actual application process is still a challenging task. The surface free energy of SR is about 19.9 mJ/m2, which can directly lead to fall off and peel off during the application process. In present study, a new type of bifunctional polyborosiloxane interfacial binder (BSiOVi) has been developed through a copolymerization method, resulting the firm bond between SR and epoxy resin (EP) and metal substrate. One end organic group of BSiOVi fixed to the surface of the substrate and the other end organic group act as initiator of the SR matrixpolymerization. The bonding strength macroscopically manifests as the cohesive failure of the silicone rubber protective material.

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“…In recent years, boron- and silicon-containing polymers, namely, polyborosiloxanes (PBSs) have been extensively studied due to their heat resistant, − flame retardant, − ceramic forming, , and self-healing − properties. The latter is due to the nature of the −B–O–Si– bond in the network structure, which splits and combines reversibly due to moisture susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Core–Shell Polyborosiloxanes as a Heat-Resistant Platform

Gunes

Karagöz

2022

ACS Omega

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Herein, new polyborosiloxanes (PBSs) were prepared using a straightforward synthetic approach to obtain a core–shell structure as a material with various features such as better adhesion ability to the applied surface and enhanced thermal properties. In this concept, in situ core–shell formation was allowed by sequential addition of ingredients with fixed conversions. First, pre-condensed polysiloxane was synthesized, with a 60% conversion, as a core by the reaction of phenyltriethoxysilane in the presence of water in an acidic condition. Subsequent addition of boric acid into the pre-condensate and a further condensation reaction resulted in the formation of the shell layer through the introduction of the −Si–O–B– bonds to the network of the PBS. The resulting resin was used as a binder for heat-resistant paint in combination with an aluminum pigment, and the paint applied on a metal plate was found to be resistant up to 600 °C in terms of adhesion strength. It was also demonstrated that the incorporation of boron in the core–shell structure showed better adhesion strength than the one-pot preparation of PBS. Using this method, not only the heat resistance requirement of the industrial coating was achieved but also the flame-retardant ability was introduced.

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Synthesis of hyperbranched polymethylvinylborosiloxanes and modification of addition‐curable silicone with improved thermal stability

Cited by 17 publications

References 26 publications

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Bonding Technology of Silicon rubber protective materials

Synthesis of Core–Shell Polyborosiloxanes as a Heat-Resistant Platform

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