P>>聚甲基丙烯酸甲酯的热导率和比热容分别处于塑料的中间水平，为0.19W/cm。K和1464J/Kg。K

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Physical Properties Of PMMA1

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PMMA Plastic Material
Excellent transparency and outstanding aging resistance
PMMA has the advantages of light weight, low cost and easy molding.

Physical Properties Of PMMA1

Product Details

Physical properties of PMMA

Polymethyl methacrylate has good comprehensive mechanical properties and ranks in the forefront of general-purpose plastics. Its tensile, bending, and compressive strengths are all higher than polyolefins, and higher than polystyrene, polyvinyl chloride, etc., and have poor impact toughness. But it is also slightly better than polystyrene. The cast bulk polymerized polymethyl methacrylate sheet (such as aerospace plexiglass sheet) has higher tensile, bending, and compression mechanical properties, and can reach the level of engineering plastics such as polyamide and polycarbonate.

Physical properties of PMMA

Generally speaking, the tensile strength of polymethyl methacrylate can reach the level of 50-77MPa, and the bending strength can reach the level of 90-130MPa. The upper limit of these performance data has reached or even exceeded some engineering plastics. Its elongation at break is only

2%-3%, so the mechanical properties are basically hard and brittle plastics, and have notch sensitivity, and are easy to crack under stress, but the fracture is not as sharp and uneven as polystyrene and ordinary inorganic glass. 40°C is a secondary transition temperature, which is equivalent to the temperature at which the pendant methyl group starts to move. Above 40°C, the toughness and ductility of the material will be improved. Polymethyl methacrylate has low surface hardness and is easy to scratch.

The strength of polymethyl methacrylate is related to the stress time, and the strength decreases as the time increases. The mechanical properties of polymethyl methacrylate (oriented plexiglass) after stretching and orientation are obviously improved, and notch sensitivity is also improved.

The heat resistance of polymethyl methacrylate is not high. Although its glass transition temperature reaches 104°C, the maximum continuous use temperature varies between 65°C and 95°C with different working conditions, and the heat distortion temperature is about 96 ℃ (1.18MPa), Vicat softening point is about 113℃. The heat resistance can be improved by copolymerization of monomers with propylene methacrylate or ethylene glycol diester acrylate. The cold resistance of polymethyl methacrylate is also poor, and the embrittlement temperature is about 9.2°C. The thermal stability of polymethyl methacrylate is moderate, better than polyvinyl chloride and polyformaldehyde, but not as good as polyolefin and polystyrene. The thermal decomposition temperature is slightly higher than 270℃, and its flow temperature is about 160℃. There is a wide range of melt processing temperature.

The thermal conductivity and specific heat capacity of polymethyl methacrylate are in the middle level of plastics, respectively, 0.19W/CM.K and 1464J/Kg.K

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