Synthesis and properties of silicone‐epoxy polymer with long silicone chain

Abstract

Silicone-epoxy polymers (SEP) with different n(Si H)/n(C C) ratios were synthesized through the hydrosilylation reaction of diallyl bisphenol A epoxy resin (DADGEBA) and hydrogen-containing silicone oil (HS) with long silicone chain.The structure of SEP was characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy ( 1 H NMR), and gel permeation chromatography (GPC), and the compatibility of the curing system was studied by dynamic mechanical analysis (DMA) and scanning electron microscope (SEM). DMA and SEM results showed that after curing with epoxy curing agent, the compatibility of the curing system was excellent. The mechanical, bonding, and thermal properties of the cured product were also measured. The cured product exhibited superior thermal stability and mechanical properties. High toughness of SEP was provided by the long silicone chain, and high mechanical strength was provided by the cross-linking networks. The maximum tensile strength was 15.64 MPa, the maximum elongation at break was 62%, and the maximum tensile lap-shear strength was 8.89 MPa. The silicone-epoxy polymers can be widely used in electronic packaging in the future.

Novel Bio‐Based Epoxy Resins with Long‐Silicone Chain from Honokiol

“…The T g values of SIHOEP-0.26-1, SIHOEP-0.26-1.5, and SIHOEP-0.26-2 were 66.42 °C, 81.36 °C, and 91.26 °C, respectively. The T g range of six groups of samples was 66.42−92.9 °C, which was significantly higher than the maximum T g of the materials synthesized by Li [28] (46.25 °C). When the same hydrogencontaining silicone oil was used, the T g of the material increased with the reaction ratio increasing.…”

“…The tensile strength was 9.92 MPa, the fracture elongation was 45.75%, and the toughness was excellent. Compared with the work of Li, [28] the tensile strength increased was 818% and the fracture elongation was increased by 90%. As the n(C = C)/n(Si−H) ratio increased, the epoxy value increased, resulting in higher density cross-linked networks.…”

“…Additionally, the C−O vibration absorption peak of epoxy group was found at 842 cm −1 . [28] The absorption peaks at 1262 and 2963 cm −1 corresponded to the asymmetric stretching vibrations of the Si−CH 3 groups. [30] These results confirmed the successful attachment of the organosilicon segments to the epoxy molecules.…”

“…[27] Nevertheless, owing to the lower epoxy values of these materials, their mechanical properties are suboptimal, such as tensile strength as low as 1.67 MPa. It has been reported that [28] the epoxy value can be increased by excessive addition of epoxy monomers, so as to obtain a mixture of organosilicon epoxy resin and unreacted epoxy monomers, thereby improving its mechanical properties. It is a challenging subject to study the intrinsic properties of the organosilicon-epoxy resin.…”

Organofluorosilicon Modified Polyacrylate with the Unidirectional Migration Promotion of Disperse Dyes toward Polyester Fabric for Wash-Free Digital Inkjet Dyeing

“…Double vinyl-capped polysiloxane (VPV) was used as the modified monomer to prepare the double vinyl-capped polysiloxane-modified polyacrylate (PSMA) containing a silicone chain segment. The infrared spectrum in Figure a showed that the CC stretching vibration absorption peak at approximately 1600 cm –1 was absent in the film . Furthermore, compared to the PA film, the PFSMA n :1 film showed three new absorption peaks at 1259, 1025, and 801 cm –1 corresponding to the bending vibration absorption peaks of a methyl group in Si–CH 3 , Si–O–Si stretching vibration absorption peak, and C–Si–C stretching vibration absorption peak .…”