Studies on the synthesis and thermal properties of alkoxysilane‐terminated organosilicone dendrimers

Abstract

Silicone core dendrimers bearing terminal dialkoxy and trialkoxy silane groups were prepared in a three-step synthesis. Initially, the Si-H terminated multifunctional silicone dendrimer, i.e. tetrakis(dimethylsiloxy)silane, was prepared by the reaction of tetraethoxysilane and dimethylethoxysilane. Tetrakis(dimethylsiloxy)silane on reaction with allylglycidylether in the presence of Speier's catalyst under pressure (100 psi) yielded epoxy-terminated dendrimer in very high yield (95%). The epoxy-terminated dendrimer was reacted with aminopropylalkoxysilanes to yield the next-generation dendrimer bearing dialkoxy and trialkoxy silane groups. The dendrimers were characterized by the usual physico-chemical techniques, i.e. elemental analysis, FT-IR, 1 H, 13 C and 29 Si NMR. Thermal studies (Thermogravimetric analysis and Thermomechanical analysis) of the alkoxy terminated dendrimers and its cured products were also carried out.

A high performance polysiloxane-based single ion conducting polymeric electrolyte membrane for application in lithium ion batteries

“…[41][42][43] 0.2 ml of PMHS was mixed in 10 ml of THF while 1.37 gram of SPSIK was dissolved in 20 ml of DMSO. The SPSIK molecules were grafted onto the poly(methylhydrogen siloxane) (PMHS) chains, following the method previously reported.…”

Dendritic, Nanosized Building Block for Siloxane‐Based Materials: A Spherosilicate Dendrimer

“…The signals can be assigned to -SiHA C H T U N G T R E N N U N G (CH 3 ) 2 and -SiHA C H T U N G T R E N N U N G (CH 3 ) 2 groups, respectively. [13] Two signals corresponding to -SiA C H T U N G T R E N N U N G (OCH 2 CH 3 ) 3 groups of 1 were hardly observed (3.86 and 1.24 ppm). These results indicate that dimethylsilylation of triethoxysilyl groups progressed without side reactions of Si À H groups under the strong acidic conditions.…”

“…Additionally, DMS-1 possesses 24 reaction sites (Si À H groups) on the surface. First, we characterized the molecular structure and thermal properties of DMS-1 by using solution 1 H, 13 C, and 29 Si NMR spectroscopy, MALDI-TOF mass spectrometry (MS), powder XRD, thermogravimetry-differential thermal analysis (TG-DTA), TG-DTA-MS, solid-state 29 Si magic angle spinning (MAS) NMR spectroscopy, and FTIR spectroscopy. Second, a DMS-1 cast film with highly ordered structure was prepared, and cross-linked by heating the film.…”

Novel Hyperbranched Polysiloxanes Containing Acetoacetyl Groups Synthesized Through Transesterification Reaction

“…Siloxane‐based dendrimers were first produced through a step‐by‐step divergent growth methodology, which contain Si–O bonds, and with controllable molecular weight and low polydispersity are widely applied in a large variety of technological fields such as new materials syntheses in medicine, additive, coating, nanotechnology, macromolecular building block, and supramolecular science. However, these dendrimers are only synthesized via cumbersome, solvent‐intensive and multistep reaction routes.…”