Silica gel science knowledge & P (b)-HongYe silico...

The last time we simply analyzed the relationship between these two words "silicone" and "Silastic". This time we continue to analyze the silicone-related meaning of the word.     We already know that silicone can only refer to the condensation of silica, can also refers to organic, inorganic silicone. The following reference to "silicone" is equivalent to the condensation of silica. Silica gel is invented by chemistry professor Walter A. Patrick at Johns Hopkins University in the United States in 1919. World War I had been used as the absorbent in gas masks. Mentioned silicone will often hear a word called "silicone" and "silicone" is referred to as silica gel, but a lot of time "silicone" What is it? Silicone epoxy resin, also known as silicone, silicon AstraZeneca (polymerized siloxanes or polysiloxanes, commonly known as silicone) is a range of organic and inorganic polymers, the chemical formula for [R2SiO] n, R = methyl, ethyl and benzene base. These materials are inorganic silicon-oxygen skeleton key (...-Si-O-Si-O-Si-O-...), and combined by covalent bonds and silicon atoms, branched-chain organic groups. In some cases, organic branched-chain two or more inorganic silicon-oxygen bond skeleton linking. Control the length of the skeleton, the organic groups of species and cross-linking of the skeleton, can be obtained with different properties and composition of silicon-oxygen resin. Its variable consistency, from liquid to gel, rubber and hard plastic. The most common type is linear polydimethylsiloxane (PDMS, a silicone oil). After reading the explanation of silicone epoxy resin, a lot of people will find that the structure of the silicon-oxygen resin how we usually talk about "Silastic" So like it? It seems the silicone epoxy resin and silicone rubber there is definitely a relationship! Organic silicon scientific name polysiloxane resin. The main chain composed of alternating silicon and oxygen atoms on the silicon atom with a thermosetting resin of the branched-chain organic groups. Is the first organic silicon products. Polysiloxane molecules, the organic substituents (R) And the ratio of silicon atoms (Si), is an important parameter of the decision in product form. When the R / Si <2, the product is a silicone resin; the R / Si ≈ 2 for the high viscosity plastic state of raw rubber, that is, Silastic; R / Si> 2, the low molecular weight oily, said silicone oil. We sort out the relationship of the above: the Chinese translation of the polymerized siloxanes polysiloxane resin, silicon that is the previously mentioned epoxy resins, polysiloxane resins referred to. The status of the six words of the above-mentioned silicone, silicone epoxy resin, silicone rubber, polysiloxane resin, silicone oil, silicone resin, polysiloxane resin, five other words it contains. Polysiloxane resin containing a silicone rubber, and sometimes as "Silastic" a noun. Silicon-oxygen resin that is a major category term can also be used as a narrow single class of nouns, the R / Si <2 when called silicon-oxygen resin. Silicone exactly the same as silicone rubber, just called different. Silicone and silicone rubber can be called a generalized "silica gel", but they are not silicone.     Draw four conclusions above, we finally see a few English words:     silica gel Process, silicone, referring to the narrow sense of "silicone", the condensation of silica; Silicone, silicone is a silicone rubber, silicone epoxy resin. Silicone epoxy resin (Silicone) the English name is derived from ketone (Ketone). Silicon, silicon refers to silicon This substance, also referred to as silicon. Silicon rubber, silicone rubber. Basically equivalent to the silicone. Silicone rubber, and Silicon rubber have the same meaning, but with less.