The glass in the photo frame is basically made of plexiglass. Plexiglass is a popular name, abbreviated as PMMA. The chemical name of this transparent polymer material is polymethyl methacrylate, which is a polymer compound formed by the polymerization of methyl methacrylate. It is an important thermoplastic that has been developed earlier. Plexiglass is divided into four types: colorless and transparent, colored and transparent, pearlescent, and embossed plexiglass. Plexiglass is commonly known as acrylic, Zhongxuan acrylic, and acrylic. Plexiglass has good transparency, chemical stability, mechanical properties and weather resistance, easy to dye, easy to process, and beautiful appearance. Plexiglass is also called gelatin glass, acrylic and so on.
The characteristics of plexiglass:
① Highly transparent. Plexiglass is currently the most excellent polymer transparent material, with a light transmittance of 92%, which is higher than that of glass. The tube of the sun lamp called the artificial little sun is made of quartz, because quartz can completely transmit ultraviolet rays. Ordinary glass can only transmit 0.6% of ultraviolet rays, but plexiglass can transmit 73%.
②High mechanical strength. The relative molecular mass of plexiglass is about 2 million. It is a long-chain polymer compound, and the chains that form the molecules are very soft. Therefore, the strength of plexiglass is relatively high, and its tensile and impact resistance are 7- higher than that of ordinary glass. 18 times. There is a kind of plexiglass that has been heated and stretched, in which the molecular chains are arranged in a very orderly manner, which significantly improves the toughness of the material. Use nails to penetrate this plexiglass, even if the nail penetrates, there will be no cracks on the plexiglass. This kind of plexiglass will not break into fragments after being penetrated by a bullet. Therefore, the stretched plexiglass can be used as bulletproof glass, and also as a cockpit cover on military aircraft.
③Light weight. The density of plexiglass is 1.18g/cm3; the weight of a material of the same size is only half that of ordinary glass, and 43% of metallic aluminum (belonging to light metal).
④Easy to process. Plexiglass can not only be cut with a lathe and drilled with a drill, but also can be bonded into various shapes with acetone, chloroform, etc., and can also be processed into airplanes by blow molding, injection, extrusion and other plastic molding methods. Cockpit covers are as small as dentures and dental trays.
Advantages of plexiglass：
1. The aesthetics of plexiglass: it has a mirror effect, exquisite craftsmanship, no wrinkles, no seams;
Second, the visual effect of plexiglass: a variety of colors and strong visual impact;
3. The light transmittance of plexiglass: the light transmittance can reach 96%, the light transmittance is excellent, and the light is relatively soft;
4. the impact resistance of plexiglass: more than 200 times that of ordinary glass products, there is almost no risk of breaking;
5. Durability of plexiglass: The product has a good protection for the built-in light source and prolongs the life of the light source product;
Sixth, the weather resistance of plexiglass: it can be guaranteed for a long time without fading, and the service life of good quality plates can be as long as 6-13 years:
