Synthesis and Degree of Branching of Epoxy-Terminated Hyperbranched Polysiloxysilane

Abstract

Hyperbranched polysiloxysilane (HBPS) with terminal vinyl groups P1 was synthesized by self-condensation reaction using platinum-catalyzed hydrosilylation of 1,1,3,5,5-pentamethyl-1,5-divinyltrisiloxane. A number-average molecular weight (M n ) was 5400 with a polydispersity index of 1.49. End-functionalization of the terminal vinyl groups was carried out by epoxidation with 3-chloroperoxybenzoic acid to afford epoxy-terminated HBPS P2. The polymers obtained were characterized by IR, 1 H, 13 C, 29 Si NMR spectroscopy. The degree of branching of HBPS was estimated as 0.57 in comparison of 29 Si NMR spectra of P2 and model compounds. The glass transition temperatures (T g ) of P1 and P2 were observed at À97 C and À77 C, respectively. The 10% weight loss temperatures (T 10 ) of P1 and P2 were over 440 C in nitrogen.KEY WORDS: Hyperbranched Polymer / Polysiloxysilane / End-functionalization / Epoxidation / Degree of Branching / Developing siloxane-based organic-inorganic hybrid polymers has attracted much attention in studies on interfaces of various organic/inorganic materials because of their unique properties such as adhesion, excellent thermal and oxidative stability, lubricity, high flexibility, and biocompatibility.

Perpendicularly-Oriented Block Copolymers Containing Silicon-Rich Hyperbranched Polymers for High Resistance to O₂-RIE

“…Hyperbranched polysiloxysilanes with hydroxyl groups at the termini (HBPSiOH) was synthesized with the reference [8].…”

“…The AB 2 monomer was successfully synthesized through the water-initiated reaction between chlorodimethylvinylsilane and dichloromethylsilane as reported in the literature [8]. PS-b-PMVS was then prepared through the sequential anionic polymerization of styrene and showed that the molecular weight and the molecular (Fig.…”

“…by introducing hyperbranched polysiloxysilanes (HBPSi) [8] to the side chains of PS-b-PMVS to increase the silicon content of the BCPs and improve the etching contrast to oxygen-reactive ion etching (O 2 -RIE). The schematic illustration for the synthesis of PS-b-[PMSi-g-HBPSiOH] is depicted in Fig.…”

“…Preparation of 1,1,3,5,5-pentamethyl-1,5-divinyltrisiloxane (AB 2 type monomer) AB 2 type monomer was synthesized via a sequential polymerization based on an existing method [8]. Water (3.33 mL), NEt 3 (27.2 mL), and Et 2 O (800 mL) were introduced into a reactor at 0 o C under nitrogen (N 2 ) flow.…”

Hyperbranched poly(ether sulfone)s: preparation and application to ion-exchange membranes

“…Recently, we prepared hyperbranched polymers, such as aromatic polyamides, [5][6][7][8][9][10][11][12][13][14][15][16][17][18] polyimides, [19][20][21][22][23][24]15,25 polyesters, 26 polysiloxanes, 27,28 poly(benzoxazole)s, [29][30][31][32][33] poly(triphenylamine), 34 PES [35][36][37][38][39] and poly (siloxysilane), [40][41][42][43][44][45] from AB 2 type monomers, and investigated their mechanical properties. Moreover, to synthesize polyamides, 46 polyimides 47,23,48 and polyphthalocyanines, [49][50][51]…”