Glass is no stranger to us. We live in an era when we can see glass everywhere, but plexiglass is not so familiar. Plexiglass is just its common name, and Plexiglass is not a general glass. It is actually a polymer compound and an important thermoplastic that has been developed earlier. Since plexiglass is a polymer compound, it must have its own chemical properties. What are the chemical properties of plexiglass?
It is resistant to chemical reagents and solvents: polymethyl methacrylate can withstand relatively dilute inorganic acids, but concentrated inorganic acids can make it corroded, and it is resistant to alkalis, but warm sodium hydroxide and potassium hydroxide It can be corroded, resistant to salt and grease, aliphatic hydrocarbons, insoluble in water, methanol, glycerin, etc., but can absorb alcohols, swell, and cause stress cracking, and is not resistant to ketones, chlorinated hydrocarbons and aromatic hydrocarbons. . Its solubility parameter is about 18.8 (J/CM3) 1/2, and it can be dissolved in many chlorinated hydrocarbons and aromatic hydrocarbons, such as dichloroethane, trichloroethylene, chloroform, toluene, etc., vinyl acetate and acetone can also make it Dissolve.
Polymethyl methacrylate has good resistance to gases such as ozone and sulfur dioxide.
It also has weather resistance: polymethyl methacrylate has excellent resistance to atmospheric aging. After 4 years of natural aging test, the sample has a slight decrease in tensile strength and light transmittance, and its color is slightly yellowed. The crazing property has decreased significantly, the impact strength has been slightly improved, and other physical properties have hardly changed.
There is also flammability: polymethyl methacrylate is easy to burn, and its limiting oxygen index is only 17.3.