PMMA的用途:
PMMA具有质轻、价廉,易於成型等优点。溶于有机溶剂如苯甲醚等,可以形成良好的薄膜和良好的介电性能,可以作为有机场效应管的介质层。
它的成型方法有浇铸,射出成型,机械加工、热成型等。尤其是射出成型,可以大批量生产,制程简单,成本低。因此,它的应用日趋广泛,目前它广泛用于仪器仪表零件、汽车车灯、光学镜片、透明管道等。
PMMA的原料图: 、
PMMA的物性表:
Physical Properties | Metric | English | Comments |
---|---|---|---|
Specific Gravity | 1.18 g/cc | 1.18 g/cc | ASTM D792 |
Water Absorption | <= 0.30 % | <= 0.30 % | ASTM D570 |
Linear Mold Shrinkage | 0.0030 - 0.0060 cm/cm | 0.0030 - 0.0060 in/in | ASTM D551 |
Melt Flow | 4.5 g/10 min @Load 3.80 kg, Temperature 230 °C |
4.5 g/10 min @Load 8.38 lb, Temperature 446 °F |
ASTM D1238 |
Mechanical Properties | Metric | English | Comments |
Hardness, Rockwell M | 80 | 80 | ASTM D785 |
Tensile Strength, Yield | 72.4 MPa | 10500 psi | ASTM D638 |
Elongation at Break | 20 % | 20 % | ASTM D638 |
Elongation at Yield | 5.0 % | 5.0 % | ASTM D638 |
Tensile Modulus | 2.80 GPa | 406 ksi | ASTM D638 |
Flexural Strength | 72.4 MPa | 10500 psi | ASTM D790 |
Flexural Modulus | 2.80 GPa | 406 ksi | ASTM D790 |
Izod Impact, Notched | 0.187 J/cm @Thickness 6.35 mm, Temperature 0.000 °C |
0.350 ft-lb/in @Thickness 0.250 in, Temperature 32.0 °F |
ASTM D256 |
0.320 J/cm @Thickness 6.35 mm, Temperature 23.0 °C |
0.600 ft-lb/in @Thickness 0.250 in, Temperature 73.4 °F |
ASTM D256 | |
Thermal Properties | Metric | English | Comments |
CTE, linear | 72.0 µm/m-°C @Temperature 0.000 - 100 °C |
40.0 µin/in-°F @Temperature 32.0 - 212 °F |
ASTM D696 |
Deflection Temperature at 1.8 MPa (264 psi) | 92.2 °C | 198 °F | ASTM D648 |
Vicat Softening Point | 104 °C | 219 °F | ASTM D1525 |
Flammability, UL94 | HB | HB | |
Optical Properties | Metric | English | Comments |
Refractive Index | 1.49 | 1.49 | ASTM D542 |
Haze | 1.0 % | 1.0 % | ASTM D1003 |
Transmission, Visible | 92 % | 92 % | ASTM D1003 |
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