Novel Hyperbranched Ferrocene-Containing Poly(boro)carbosilanes Synthesized via a Convenient “A₂+ B₃” Approach

Abstract

We report the synthesis of versatile hyperbranched ferrocene-containing poly(boro)carbosilanes (hb-PBCS) via a convenient "A 2 þ B 3 " approach. Two types of hb-PBCS are obtained by the hydrosilylation of 1,1 0 -bis-(dimethylsilyl)ferrocene (A 2 ) with trivinylmethylsilane (B 3 ) followed by modification with 9-borabicyclo[3.3.1]nonane (9-BBN) and by the hydroboration of 1,1 0 -bis(dimethylvinylsilyl)ferrocene (A 2 ) with the borane-dimethyl sulfide complex (B 3 ), respectively. Size exclusion chromatography (SEC) results demonstrate that the well-soluble hb-PBCS possess appreciable weight-average molecular weight (M w,SEC ) up to 62 300 g/mol with the polydispersity index (PDI) of 1.95-4.51. The combined characterization by 1 H-29 Si heteronuclear multiple-bond correlation (HMBC), 11 B nuclear magnetic resonance (NMR), and triple-detection SEC (triple-SEC) confirms the remarkable hyperbranched architecture of hb-PBCS with degrees of branching (DB) between 0.47 and 0.79. The Mark-Houwink-Sakurada exponents of hb-PBCS obtained from triple-SEC are significantly lower (R = 0.36-0.47) than that of their linear analogue (R = 0.69).

Synthesis of cross‐linked polymer microspheres and pyrolysis conversion to polymer‐derived ceramics

“…Among the diverse forms of PDCs, spherical ceramic especially with a nano‐ or micro‐meter size has played an important role in emerging applications, such as the electrode materials of lithium ion batteries and magnetic ceramics . Much effort has been devoted to prepare spherical PDCs.…”

A convenient synthesis strategy for microphase-separating functional copolymers: the cyclohydrocarbosilane tool box

“…[9][10][11][12][13][14][15][16][17][18][19] As another important and feasible route towards functional materials, block copolymer self-assembly strategies can be advantageously used for the controlled buildup of ceramic nanostructures obtained by pyrolysis of inorganic/organic block copolymers. [44][45][46][47] Especially polycarbosilanes gained significant attention due to their outstanding potential to be converted into oxygen-free ceramic materials. 20,21 Different approaches for the preparation of ceramic materials inclusively nanocomposites are known and excellent reviews within that field are given for example by Orilall and Wiesner 22 and other authors.…”

Structural evolution of imidazolium-based poly (ionic liquid) assemblies during solvent evaporation

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The fabrication of polymer-based assemblies with molecular packing at different length scales has recently received a great deal of attention due to their promising potentials to produce functional, nanostructured materials [1][2][3][4][5]. Amphiphilic block or graft copolymers are common candidates for such self-assembled organization and ordering in nano-, and mesoscale.

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