Linear and star architecture methacrylate-functionalised PDMS

Abstract

Methacrylate-terminated poly(dimethylsiloxane)s in both linear and star architectures have been produced through a time-efficient 1 pot, 2 stage reaction which involved hydrosilylation of small molecule silanes with allyl methacrylate and subsequent equilibration of the product with octamethylcyclotetrasiloxane (D 4 ) in the presence of an acid catalyst. This synthetic route required only one work-up procedure and the products were comparable to those produced by 2 step processes typically reported in literature. All methacrylate-terminated products were approximately double the molar masses anticipated based on reagent loadings. This is thought to be due to redistribution of siloxane bonds in the presence of the platinum hydrosilylation catalyst accompanied by a loss of silicon from the reaction by evaporation of dimethylsilane. It is believed that this is the first report of such siloxane equilibration occurring at room temperature.

Correlating Nanomechanical Mapping and Single-Molecule Localization Microscopy for Local Properties in Interpenetrating Network Elastomers

“…1,3-Bis(3methacryoxypropyl)tetramethyldisiloxane was synthesized as reported in the literature. 73 Sodium bicarbonate and ammonium carbonate were purchased from Fisher Scientific. Nylon filtration membranes were purchased from GVS (Magna).…”

Ring-Opening Polymerization (ROP) and Catalytic Rearrangement as a Way to Obtain Siloxane Mono- and Telechelics, as Well as Well-Organized Branching Centers: History and Prospects

“…Benjamin T. Cheesmana et al prepared acrylate PDMS telechelics by the ROP mechanism in the presence of a trifluoromethanesulfonic acid catalyst. 1,3-bis(methacryl) tetramethyldisiloxane obtained by hydrosilylation of allyl methacrylate was used as a blocking agent (Figure 26) [143]. The methacrylate-terminated PDMS macromonomers synthesized in this study have been successfully used to form films by UV-induced crosslinking, and studies of the properties of crosslinked films are the subject of future publications.…”

Fabrication of Reactive Poly(Phenyl-Substituted Siloxanes/Silsesquioxanes) with Si‒H and Alkoxy Functional Groups via the Piers–Rubinsztajn Reaction

“…Thus, it is not only used as a catalyst in the reduction of organic compounds by hydrosilanes [7,8]. but also in hydrosilylation reactions in organosilicon chemistry, leading to the formation of siloxane or silylether bonds [9,10]. Typical oxygen-based nucleophiles containing –OH or alkoxy groups [11] including phenols [11] and even graphene oxide [12] and lignin [13,14] are effectively reduced by hydrosilanes in the presence of B(C 6 F 5 ) 3 to give alkanes or silyl ethers—this is the Piers–Rubinsztajn (PR) reaction, which is a kind of hydrosilylation reaction.…”