Synthesis of polyborosiloxane and its reversible physical crosslinks

Abstract

A hybrid polyborosiloxane was synthesized and the effect of boron concentration on the Si–O : B weak bonding of polyborosiloxane was investigated mainly using FTIR and dynamic rheology.

Chemoselective and Catalyst‐Free O‐Borylation of Silanols: A Facile Access to Borasiloxanes

“…The applications of silicon and boron derivatives in organic and inorganic chemistry are innumerable and their compounds containing bonds with other heteroatoms have received considerable attention, particularly as reagents in metal‐free reactions . The B‐O‐Si moiety is common in material chemistry, especially in the synthesis of poly(borosiloxane)s, which show unique and valuable properties, including high stability and heat resistance . Efficient and chemoselective procedures for the synthesis of borasiloxanes are thus both very important and highly desirable.…”

“…All of the investigated substrates were excellent reagents for dehydrocoupling andl ed to the targetp roducts.I ne ach case, ar apid bubbling of H 2 was observed. Liquid silanols (1 equiv) react with pinacolborane( 1.05 equiv) strictly withouts olvent ( Table 3, entries [1][2][3][4]8). Tris(tert-butoxy)silanol ( Table 3, entry 6) reactedv ery slowly (30 %o ft he target product after 2h).…”

“…The reaction progress was monitored by GC and GC-MS analyses. After the reaction was completed, the excess toluene and hydroborane (which was as ingle residue) were removed under reduced pressure to give the corresponding products (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13).…”

Wear of abrasive media and its effect on abrasive flow machining results

“…Structural variations of the carrier medium polyborosiloxane are clearly visible in IR spectra and, for instance, examined in dependency of thermal degradation or composition by Li et al [20] and Alonso et al [21]. In figure 11, the fingerprint section of the IR spectra for the new and used 14 In addition, the specific material removal rate is determined for both abrasive media, and the results are illustrated in figure 13 (b).…”

Introduction of Boron Functionalities into Silsesquioxanes: Novel Independent Methodologies

“…[23][24][25][26][27][28] On the other hand, the boron modification of variousc ompounds, [29][30][31][32][33] polymers, [34,35] and nanoparticles is attractivef or aw ide range of applications. [39][40][41] As such, efficient and chemoselective procedures for the synthesis of borasiloxanes are thusb oth very important and highly desirable. [39][40][41] As such, efficient and chemoselective procedures for the synthesis of borasiloxanes are thusb oth very important and highly desirable.…”