Thermal stability of hybrid materials based on epoxy functional (poly)siloxanes

Abstract

Epoxy functional (poly)siloxanes are one of the most important classes of modified silicones. Due to high reactivity of epoxy group and specific features of siloxane chain, they can make an excellent raw material for synthesis of hybrid materials. Results obtained in this study have shown that both the modification of epoxy resins with epoxy functional disiloxanes as well as the application of polysiloxanes with long polysiloxane chains and a specified content of epoxy groups makes it possible to produce hybrid materials of very good thermal stability. Crosslinking reactions were carried out with use of four diamines of which the best one appeared to be 4,4 0-diaminodiphenylmethane. The highest thermal stability was found in the case of hybrid materials obtained from epoxy functional polysiloxanes.

Oxidation Studies of SiAlON/MgAlON Ceramics with Fe2O3 and CaO Impurities, Part I: Kinetics

“…The relative contributions to the overall reaction rate would be to make the effective activation energy dependent on the extent of oxidation. [19] In the current discussions, a step modeling method was adopted to extract the effective activation energy corresponding to the various oxidation stages.…”

Preparation and mechanism of free‐radical/cationic hybrid photosensitive resin with high tensile strength for three‐dimensional printing applications

“…By introducing the cationic photosensitive resin, the free-radical/cationic hybrid photosensitive resin can be prepared. 27 Cationic PIs are relatively insensitive to oxygen, which can initiate the polymerization of epoxy resin in oxygen-enriched environments, 28 and improve the curing rate as well as the storage performance of the hybrid resin.…”

Synthesis, Characterization, and Thermal Properties of Organic–Inorganic Hybrids Based on Gelatin and Organomodified Silicones

“…Hybrid materials can be used in the textile, packaging, construction, automobile industries, as well as in micro-optics, microelectronics, in the synthesis of functional coatings or biosensors, biocatalysts, and novel materials for dentistry, cosmetics, therapeutic vectors, or biomedical purposes. [15][16][17] The literature offers numerous reports on modification of gelatin with silicon compounds; 18-21 however, there is little information about gelatin-siloxane systems obtained with organomodified silicones. However, a characteristic feature of this class of compounds is also their chemical inertness; therefore, to make reactive siloxanes, a modification of (poly)siloxane chains is performed by introducing various functional groups.…”

“…The high reactivity of the oxirane ring of epoxides makes it possible to obtain a wide range of compounds or organic-inorganic hybrid materials. [15][16][17] The literature offers numerous reports on modification of gelatin with silicon compounds; [18][19][20][21] however, there is little information about gelatin-siloxane systems obtained with organomodified silicones. 19,22,23 Ren et al reported preparation of a new type of inorganic-organic hybrids based on gelatin and 3-(glycidoxypropyl)trimethoxysilane (GPTMS) through sol-gel processing.…”

“…The presence of inorganic and organic functionalities in a single polymer results in a unique combination of such properties such as weatherability, UV resistance, and thermo‐oxidative stability. The high reactivity of the oxirane ring of epoxides makes it possible to obtain a wide range of compounds or organic–inorganic hybrid materials …”