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

Meshkov, I. B.; Калинина, А. А.; Gorodov, V. V.; Bakirov, Artem V.; Krasheninnikov, Sergey V.; Чвалун, С. Н.; Muzafarov, А. М.

doi:10.3390/polym13172848

Cited by 24 publications

(25 citation statements)

References 47 publications

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“…Such observations supported in many aspects our own studies which have demonstrated [ 43 ] that MQ -resins are also very effective as an active filler, significantly enhancing the mechanical properties of vulcanizates, not inferior in efficiency to aerosils, but without requiring the heterophase mixing of ingredients. Of course, such an influence of the molecular filler was expected and even planned.…”

Section: Introductionsupporting

confidence: 81%

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True Molecular Composites: Unusual Structure and Properties of PDMS-MQ Resin Blends

et al. 2022

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Poly(dimethyl siloxane)-MQ rubber molecular composites are easy to prepare, as it does not require a heterophase mixing of ingredients. They are characterized by perfect homogeneity, so they are very promising as rubber materials with controllable functional characteristics. The manuscript reveals that MQ resin particles can significantly, more than by two orders of magnitude, enhance the mechanical properties of poly(dimethyl siloxane), and, as fillers, they are not inferior to aerosils. In the produced materials, MQ particles play a role of the molecular entanglements, so rubber molecular weight and MQ filler concentration are the parameters determining the structure and properties of such composites. Moreover, a need for a saturation of the reactive groups and minimization of the surface energy of MQ particles also determine the size and distribution of the filler at different filler rates. An unusual correlation of the concentration of MQ component and the interparticle spacing was revealed. Based on the extraordinary mechanical properties and structure features, a model of the structure poly(dimethyl siloxane)-rubber molecular composites and of its evolution in the process of stretching, was proposed.

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Section: Introductionsupporting

confidence: 81%

“…The content of amino groups determined by titration was 0.04 wt.%. Detailed synthesis for the used components was described elsewhere [ 43 ].…”

Section: Methodsmentioning

confidence: 99%

True Molecular Composites: Unusual Structure and Properties of PDMS-MQ Resin Blends

et al. 2022

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“…Hyperbranched polymers are universal macromolecular objects that are irregular analogues of dendrimers, combining a number of advantages of the latter with the ease of obtaining of classical polymers. Hyperbranched polymers have now found a wide range of applications, due to the presence of a number of unique physical and chemical properties. , In terms of view of siloxane systems, their easy transformation into nanogels has breathed new life into the concept of obtaining molecular composites. , …”

Section: Resultsmentioning

confidence: 99%

“…51,52 In terms of view of siloxane systems, their easy transformation into nanogels has breathed new life into the concept of obtaining molecular composites. 53,54 One of the methods for obtaining hyperbranched polymers is based on the use of Rebrov's salt 55 − compounds with the general formula R n (OR′) 3−n SiONa, allowing us to obtain diverse siloxane structures, from individual compounds to gels of complex structures. 25,56−59 To demonstrate the versatility of our approach to the functionalization of polysiloxane structures, we used hyperbranched silsesquioxanes of various structures and molecular weights in our work (1-10−1-12).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Environment Friendly Process toward Functional Polyorganosiloxanes with Different Chemical Structures through CuAAC Reaction

Bezlepkina

Ardabevskaia

Klokova

et al. 2022

ACS Appl. Polym. Mater.

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Despite the presence of many methods, which were created to date for the preparation, functionalization, and vulcanization of polysiloxanes, the development of materials based on silicones remains relevant and requires the introduction of new approaches that combine such modern strategies as atom-economical reactions, refusal to use harmful and dangerous organochlorosilanes, and using the principles of green chemistry and minimizing the use of solvents. In this work, we develop modern approaches to the preparation of both linear and branched polyorganosiloxanes containing azidopropyl functions at the silicon atom. In the first part of the work, it was shown that the proposed method for introducing these groups by catalytic rearrangement with the opening of cyclosiloxane is effective and makes it possible to obtain polysiloxanes with different contents of azidopropyl groups and different molecular weights. The second part of the work demonstrated the possibility of postpolymerization functionalization of such polymers by the mechanism of azide–alkyne cycloaddition under “green” conditions, without using solvents and amines. All of the most important functional fragments were introduced into the structures of organosilicon polymers by a single mechanism, under simple conditions, without the use of expensive catalysts, exposure to irradiation, and hazardous solvents. The combination of simplicity and versatility in the preparation of polysiloxanes with azidopropyl groups with the possibility of performing a click reaction makes it possible to directionally obtain the required materials based on universal raw materials and, as a result, can open up broad prospects for serious development and rethinking of the chemistry of silicones.

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“…The development of modern technologies requires more careful control over the properties of the resulting products. − One way of realizing this is the use of narrowly dispersed oligomers and polymers. Such compounds allow for tuning the properties of the products by varying the molar mass in a controlled manner.…”

Section: Introductionmentioning

confidence: 99%

Low Dispersity Telechelic Polydimethylsiloxanes Synthesized in Ammonia Medium

Minyaylo

Temnikov

Анисимов

et al. 2022

ACS Appl. Polym. Mater.

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The polymerization of hexamethylcyclotrisiloxane (D 3 Me2 ) in liquid ammonia using water as an initiator has been studied. These polymers are of practical importance for a wide range of applications in the silicone industry. The effect of factors such as temperature, reaction time, and concentration of reactants on the polymerization process was evaluated. As a result, an environmentally friendly procedure for the preparation of narrowly dispersed telechelic polydimethylsiloxanes (Mn = 8.0 kDa, PDI = 1.11) with a monomer conversion of up to 98% was developed. The possibility of scaling up the process and recycling of ammonia was shown.

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

Cited by 24 publications

References 47 publications

True Molecular Composites: Unusual Structure and Properties of PDMS-MQ Resin Blends

True Molecular Composites: Unusual Structure and Properties of PDMS-MQ Resin Blends

Environment Friendly Process toward Functional Polyorganosiloxanes with Different Chemical Structures through CuAAC Reaction

Low Dispersity Telechelic Polydimethylsiloxanes Synthesized in Ammonia Medium

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