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 | 1.19 g/cc | 1.19 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 | 14 g/10 min @Load 3.80 kg, Temperature 230 °C |
14 g/10 min @Load 8.38 lb, Temperature 446 °F |
ASTM D1238 |
Mechanical Properties | Metric | English | Comments |
Hardness, Rockwell M | 90 | 90 | ASTM D785 |
Tensile Strength, Yield | 70.3 MPa | 10200 psi | ASTM D638 |
Elongation at Break | 2.5 % | 2.5 % | ASTM D638 |
Elongation at Yield | 2.5 % | 2.5 % | ASTM D638 |
Tensile Modulus | 3.70 GPa | 537 ksi | ASTM D638 |
Flexural Strength | 67.9 MPa | 9850 psi | ASTM D790 |
Flexural Modulus | 3.40 GPa | 493 ksi | ASTM D790 |
Izod Impact, Notched | 0.133 J/cm @Temperature 23.0 °C |
0.250 ft-lb/in @Temperature 73.4 °F |
ASTM D256 |
Thermal Properties | Metric | English | Comments |
CTE, linear | 61.2 µm/m-°C @Temperature -30.0 - 30.0 °C |
34.0 µin/in-°F @Temperature -22.0 - 86.0 °F |
ASTM D696 |
Deflection Temperature at 1.8 MPa (264 psi) | 91.1 °C | 196 °F | ASTM D648 |
Vicat Softening Point | 104 °C | 219 °F | ASTM D1525 |
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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