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Use of polymethyl methacrylate (PMMA)

Use of polymethyl methacrylate (PMMA)


The polymethyl methacrylate (PMMA), based on its excellent properties, is versatile. In addition to being used as a canopy, windshield and porthole of the aircraft, it is also used as a windshield and window for jeep, a skylight for large buildings (being shatterproof), a screen for televisions and radars, a shield for instruments and equipment, housing for telecommunication instruments, and optical lenses for telescopes and cameras. 

Many daily necessities are made of polymethyl methacrylate (PMMA), such as buttons of pearlescent polymethyl methacrylate (PMMA). All kinds of toys and lamps are also beautifully made because of the decorative effect of colored polymethyl methacrylate (PMMA). 

Polymethyl methacrylate (PMMA) has a wonderful use in pharmaceuticals. That is, to make artificial corneas. If the transparent cornea of the human eye is covered with opaque material, the light cannot enter the eye. This is blindness caused by total corneal leukoplakia, and the disease cannot be treated with drugs. 

Then, the medical scientist envisaged replacing the cornea with white spots with artificial cornea. The so-called artificial cornea is to use a transparent substance to make a mirror column with a diameter of only a few millimeters, then drill a small hole in the cornea of the human eye, fix the mirror column on the cornea, and the light enters the eye through the mirror column. Then the sight is recovered! 

As early as 1771, an ophthalmologist used optical glass to make a mirror column and implanted it into the cornea, but it was not successful. Later, crystal was used to replace optical glass, but it was still a failure only after half a year. In the Second World War, when some planes crashed, the canopy made of polymethyl methacrylate (PMMA) on the plane was broken, and the pilot's eyes were embedded with such fragments. These fragments were not taken out and did not cause any inflammation or other adverse reactions in the human eyes after many years. This incident happened to indicate that polymethyl methacrylate (PMMA) and human tissue have good compatibility. At the same time, it also inspired ophthalmologists to make artificial corneas with polymethyl methacrylate (PMMA). It has good light transmission, stable chemical properties, and it is non-toxic to human body, easy to be processed into the desired shape, and can be compatible with human eyes for a long time. Currently, artificial corneas made of polymethyl methacrylate (PMMA) are commonly used in the clinic. 

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