派瑞林塗層
Parylene Coating
化學分子結構
派瑞林二聚體與成膜聚合結構
派瑞林 N、C、AF4是市場上常用於奈米保形塗層的派瑞林粉材， 其分子二聚體與其成膜聚合結構列於下表中：
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| Parylene Variants | Dimers | Polymers |
|---|---|---|
| Parylene N |  |  |
| Parylene C |  |  |
| Parylene AF4 |  |  |
電性能
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Dielectric Constant (@ 60Hz/1KHz/1MHz) | 2.21/2.20/2.17 | 2.65/2.65/2.65 | 3.15/3.10/2.95 |
| Dissipation Factor (@ 60Hz/1KHz/1MHz) | <0.0002/0.002/0.001 | 0.0002/0.0002/0.0006 | 0.020/0.019/0.013 |
| Dielectric Strength (V/mil) | 5,400 | 7,000 | 5,600 |
| Volume Resistivity (Ohm-cm) | 2.0x10¹⁷ | 1.4x10¹⁷ | 8.8x10¹⁷ |
| Surface Resistivity (Ohms) | 5.0x10¹⁵ | 1.0x10¹⁵ | 1.0x10¹⁵ |
熱性能
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Linear Coefficient of Thermal Expansion (CTE) @ 25°C (ppm) | 36 | 69 | 35 |
| Continuous Operating Temp. (°C) | 350 | 60 | 80 |
| Short-term Operating Temp. (°C) | 450 | 80 | 100 |
| Thermal Conductivity @ 25°C (W/(m.K)) | 0.096 | 0.126 | 0.084 |
| Specific Heat @ 20°C (J/(g.K)) | 1.04 | 0.837 | 0.712 |
| Thermal Shock | PASS | PASS | PASS |
| Flame Resistance | Self extinguishing | Self extinguishing | Self extinguishing |
| UV Exposure Time in air (hrs) | Stable up to 2000 | Unstable | Unstable |
透氣性@ 25 °C
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| N₂ gas permeability (cc.mm)/(m².day.atm) | 4.8 | 3.0 | 0.4 |
| O₂ gas permeability (cc.mm)/(m².day.atm) | 23.5 | 15.4 | 2.8 |
| CO₂ gas permeability (cc.mm)/(m².day.atm) | 95.4 | 84.3 | 3.0 |
| H₂ gas permeability (cc.mm)/(m².day.atm) | NA | 212.6 | 43.3 |
阻隔性
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Water Vapor Transmission Rate (g.mm/m²day) | 0.22 | 0.59 | 0.08 |
| Water Absorption (% after 24 hrs) | <0.01 | <0.1 | <0.1 |
耐化學性
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Coated PCB Salt Fog Test for 144 hrs | PASS | - | - |
| 70% Nitric acid, % Swelling @RT | 0 | 0.2 | 0.2 |
| 70% Nitric acid, % Swelling @75 °C | 1.2 | Brittle | 1.8 |
| 95-98% H₂SO₄, % Swelling @RT | 0 | 0.2 | 0.4 |
| 95-98% H₂SO₄, % Swelling @75 °C | 2.8 | 5.3 | 5.1 |
機械性能
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Tensile Module (psi) | 380,000 | 350,000 | 460,000 |
| Tensile Strength (psi) | 7,500 | 7,000 | 10,000 |
| Yield Strength (psi) | 5,000 | 6,100 | 8,000 |
| Rockwell Hardness | R122 | R85 | R80 |
| Yield Elongation (%) | 2.0 | 2.5 | 2.9 |
| Elongation to Break (%) | Up to 200 | Up to 250 | Up to 200 |
| Coefficient of Friction Static/Dynamic | 0.15/0.13 | 0.25/0.25 | 0.29/0.29 |
其他特性
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| Properties | Parylene AF4 | Parylene N | Parylene C |
|---|---|---|---|
| Reflection Index (ND23) | 1.56 | 1.66 | 1.64 |
| Penetration Ability (aspect ratio) | 50xdiameter | 40xdiameter | 5xdiameter |
| Water Contact Angle | 101.83° | 74.84° | 78.61° |
| USP Class VI Polymer | Yes | Yes | Yes |