What are the advantages of bidirectional polyimide film
Biaxially Oriented Polyimide Film (BOPI) is a high-performance film prepared by biaxially stretching process, which is widely used in aerospace, electronic and electrical, new energy and other fields. Its advantages are mainly reflected in the following aspects:
1、 Excellent physical and mechanical properties
1. High strength and high modulus
The biaxial stretching process enables the mo
Biaxially Oriented Polyimide Film (BOPI) is a high-performance film prepared by biaxially stretching process, which is widely used in aerospace, electronic and electrical, new energy and other fields. Its advantages are mainly reflected in the following aspects:
1、 Excellent physical and mechanical properties
1. High strength and high modulus
The biaxial stretching process enables the molecular chains to be arranged in an orderly manner in both horizontal and vertical directions, significantly improving the mechanical strength of the film. Its tensile strength can reach 200-300 MPa, and its elastic modulus exceeds 4 GPa, far higher than ordinary polymer films (such as PET). It can still maintain shape stability in complex stress environments and is suitable as a structural support material.
2. Tear resistance and fatigue resistance
The thin film structure is uniform and dense, with high tear resistance and is not easily cracked under repeated bending or vibration. It can be used in scenarios such as flexible circuits and cable insulation that require long-term resistance to mechanical stress.
2、 Outstanding high temperature and weather resistance
1. Wide temperature range stability
Has an extremely wide range of operating temperatures:
Long term temperature resistance: It can be used for a long time from -269 ℃ (liquid helium environment) to 260 ℃, with a short-term temperature resistance of over 300 ℃ and almost no performance degradation. It is the choice of high-temperature insulation materials in the aerospace field (such as rocket engine cable wrapping).
Low coefficient of thermal expansion: about (2-3) × 10 ⁻⁵/℃, with good compatibility with thermal expansion of materials such as silicon chips and metals, avoiding interface cracking caused by temperature fluctuations, suitable for high-precision electronic device packaging.
Resistant to aging and radiation
The aromatic rings and imide groups in the molecular structure endow it with excellent resistance to ultraviolet radiation, gamma rays, and electron radiation. It can maintain stable performance in strong radiation environments such as space and nuclear industry, and is not easily yellowed or degraded.
3、 Good electrical insulation performance
1. High insulation strength
The breakdown field strength exceeds 200kV/mm, the volume resistivity is greater than 10 ¹⁶Ω· cm, and it can maintain excellent insulation in high-frequency and high-voltage environments. It is a key material for insulation of thin film capacitors and motor slots.
2. Low dielectric loss
At a frequency of 1MHz, the dielectric constant is approximately 3.0-3.5, and the dielectric loss tangent is less than 0.005. It is suitable for scenarios such as 5G communication and high-frequency circuits that require high signal transmission quality, reducing energy loss and signal distortion.
4、 Unique chemical stability
1. Solvent and corrosion resistance
It has strong resistance to acids, bases, and organic solvents such as ethanol, acetone, and lubricating oil, and is not easily swollen or chemically degraded. It can be used for electrical insulation in chemical equipment sealing and corrosive environments.
2. Low moisture absorption
The water absorption rate is only 0.2% -0.4%, and it can maintain stable electrical and mechanical properties in humid environments, avoiding insulation failure caused by moisture absorption. It is suitable for high humidity industrial environments (such as marine engineering).
5、 Processing adaptability and functional expansion
1. Ultra thin and flexible processing
Thin films with a thickness of only 5-250 μ m can be prepared through precision stretching technology, and have excellent flexibility, which can be curled into extremely small diameters (such as ≤ 1mm), meeting the demand for lightweight and lightweight flexible electronics and wearable devices (such as flexible OLED screen substrates).
2. Surface modification compatibility
The surface of the film can be further optimized through processes such as plasma treatment and coating to enhance its adhesion with materials such as metals and ceramics, or to provide anti-static and scratch resistant functions, expanding its application scenarios (such as copper clad laminate substrates).
6、 Environmental Protection and Sustainability
1. Halogen free and low toxicity
The raw materials do not contain halogen elements such as chlorine and bromine, and do not release toxic gases during combustion. They comply with environmental standards in the electronic and electrical industry (such as the RoHS directive) and are suitable for the manufacturing of green electronic products.
2. Recyclable and composite utilization
Although complete degradation is difficult, its high temperature resistance allows it to be partially regenerated through physical crushing or solvent recovery, or combined with other materials (such as aluminum foil or glass fiber laminates) to prepare high-performance composite materials, improving resource utilization.
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