Polymethyl methacrylate (PMMA) with a very superior optical performance, the board tilting commonly known as Plexiglas, is a highly transparent thermoplastic. Its products include plates, tubes, rods, molding and other varieties. Widely used in aviation, radio, instruments, meters, medical equipment, decorations, instructions and so on.
Together the main properties of methyl methacrylate (mma) :Gather methylacrylic acid methyl ester (PMMA) a colorless transparent glass ones and specific gravity of 1.19, the surface hardness is low, easy to be good thing scratch. Hard to catch fire, but can slow combustion, the fire was still can continue to burning and burning easily break, molten distill, flame bright, bottom blue, top white, issued a strong smell the flowers and rotting vegetables bad smell.
1. Transparency: PMMA is amorphous polymer, its internal molecular arrangement from interference in its light through the speed of each part, and can make the light with the same speed (namely uniform refractive index), don't make the light scattered all around mutual interference. So PMMA excellent optical performance, high transmission rate (90 ~ 92%, and wavelength). Very smooth surface of the piece or bar, in bending to the limits can also will be scored from one end of the light in the internal reflection all forward, finally from the other end injection, like water pipe in through the same (certain refers to the degree of curvature of the position and bending the original position to Angle, no more than 42 °; bending with arc arc radius, must be more than bar diameter or plate thickness of the 3 times). But when the surface of a part of the grinding hair, light can from here to escape and shows light. Can use this property to make edge lighting apparatus, surgical medical apparatus, etc.
2. Mechanical properties: PMMA mechanical strength than common glass high 10 times above, but compared with other plastic strength can calculate medium. Its defect is qualitative light crisp, and easy to crack (or appear silver lines), surface hardness is low, easy scratches and lose luster; A poor wear-resistance, the static friction coefficient between each other is 0.8, the frictional coefficient of steel is 0.45 ~ 0.50, so easy to scratch grinding wool.
3. Performance: PMMA is good performance, especially in low frequency work conditions. Yet its some performance is unique: dielectric loss Angle tangent on frequency increases and reduced. Temperature and frequency of dielectric constant is influential, and climate and humidity on the influence of the electric performance is not big. But electric performance than PE, PS pattern.
4. Thermal performance: PMMA heat resistance is not good enough, using temperature of only 80 ℃. Through its single and double ester base acrylic glycol esters or methyl methacrylate acrylic ester, crosslinking copolymerization, in order to improve the heat resistance. The heat PMMA than most thermoplastic are low, which is helpful for its fast plasticizing heated. And it still has certain cold resistance, in the low 50 ~ 60 ℃- , impact strength changed little.
5. Chemical properties; PMMA has certain chemical corrosion-resistant ability, but increases with temperature decrease. Gas chemically resistant ability is strong, long-term and ozone, sulfur dioxide, contact, did not appear corrosion situation; Chlorine can corrode its surface. Can dissolve in ethyl acetate or butyl acetate, glacial acetic acid, chloroform and benzene, etc; Can absorb all kinds of alcohol organic compound, make volume expansion, the surface coarse wool, but insoluble in aliphatic compounds.
6. Resistance to climate sex: excellent weathering resistance, in the tropical climate exposure transparency and colour and lustre is very little change for many years.
Read more: Buy A IF850 PMMA
Together the main properties of methyl methacrylate (mma) :Gather methylacrylic acid methyl ester (PMMA) a colorless transparent glass ones and specific gravity of 1.19, the surface hardness is low, easy to be good thing scratch. Hard to catch fire, but can slow combustion, the fire was still can continue to burning and burning easily break, molten distill, flame bright, bottom blue, top white, issued a strong smell the flowers and rotting vegetables bad smell.
1. Transparency: PMMA is amorphous polymer, its internal molecular arrangement from interference in its light through the speed of each part, and can make the light with the same speed (namely uniform refractive index), don't make the light scattered all around mutual interference. So PMMA excellent optical performance, high transmission rate (90 ~ 92%, and wavelength). Very smooth surface of the piece or bar, in bending to the limits can also will be scored from one end of the light in the internal reflection all forward, finally from the other end injection, like water pipe in through the same (certain refers to the degree of curvature of the position and bending the original position to Angle, no more than 42 °; bending with arc arc radius, must be more than bar diameter or plate thickness of the 3 times). But when the surface of a part of the grinding hair, light can from here to escape and shows light. Can use this property to make edge lighting apparatus, surgical medical apparatus, etc.
2. Mechanical properties: PMMA mechanical strength than common glass high 10 times above, but compared with other plastic strength can calculate medium. Its defect is qualitative light crisp, and easy to crack (or appear silver lines), surface hardness is low, easy scratches and lose luster; A poor wear-resistance, the static friction coefficient between each other is 0.8, the frictional coefficient of steel is 0.45 ~ 0.50, so easy to scratch grinding wool.
3. Performance: PMMA is good performance, especially in low frequency work conditions. Yet its some performance is unique: dielectric loss Angle tangent on frequency increases and reduced. Temperature and frequency of dielectric constant is influential, and climate and humidity on the influence of the electric performance is not big. But electric performance than PE, PS pattern.
4. Thermal performance: PMMA heat resistance is not good enough, using temperature of only 80 ℃. Through its single and double ester base acrylic glycol esters or methyl methacrylate acrylic ester, crosslinking copolymerization, in order to improve the heat resistance. The heat PMMA than most thermoplastic are low, which is helpful for its fast plasticizing heated. And it still has certain cold resistance, in the low 50 ~ 60 ℃- , impact strength changed little.
5. Chemical properties; PMMA has certain chemical corrosion-resistant ability, but increases with temperature decrease. Gas chemically resistant ability is strong, long-term and ozone, sulfur dioxide, contact, did not appear corrosion situation; Chlorine can corrode its surface. Can dissolve in ethyl acetate or butyl acetate, glacial acetic acid, chloroform and benzene, etc; Can absorb all kinds of alcohol organic compound, make volume expansion, the surface coarse wool, but insoluble in aliphatic compounds.
6. Resistance to climate sex: excellent weathering resistance, in the tropical climate exposure transparency and colour and lustre is very little change for many years.
Read more: Buy A IF850 PMMA
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