PS has good electrical performance

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Product Description

PS generally has a head tail structure, with a saturated carbon chain as the main chain and a conjugated benzene ring as the side group, which makes the molecular structure irregular and increases the rigidity of the molecule, making PS a non crystalline linear polymer. Due to the presence of benzene rings, PS has a high Tg (80-105 ℃), making it transparent and hard at room temperature. However, due to the rigidity of the molecular chain, it is prone to stress cracking.

Polystyrene is colorless and transparent, capable of free coloring, and has a relative density second only to PP and PE. It has excellent electrical properties, especially good high-frequency characteristics, second only to F-4 and PPO. In addition, it is second only to methyl acrylic resin in terms of photostability, but its radiation resistance is the strongest among all plastics. The most important feature of polystyrene is its excellent thermal stability and flowability during melting, making it easy to shape and process, especially injection molding, which is suitable for mass production. The molding shrinkage rate is small, and the dimensional stability of the molded product is also good.

mechanical property General Grade Polystyrene

Polystyrene molecules and their aggregated structure determine that it is a rigid and brittle material, exhibiting brittle fracture under stress.

Thermal performance Polyformaldehyde

The characteristic temperatures of polystyrene are: brittleness temperature of around -30 ℃, glass transition temperature of 80-105 ℃, melting temperature of 140-180 ℃, and decomposition temperature of over 300 ℃. Due to the significant decrease in mechanical properties and poor heat resistance of polystyrene with increasing temperature, the continuous use temperature is around 60 ℃, and the maximum temperature should not exceed 80 ℃. The thermal conductivity is low, ranging from 0.04 to 0.15 W/(m · K), and is almost unaffected by temperature, thus exhibiting good insulation properties. Polyamide

Electrical performance

Polystyrene has excellent electrical properties, with volume resistivity and surface resistivity reaching 1016-1018 Ω· cm and 1015-1018 Ω, respectively. The dielectric loss tangent value is extremely low and is not affected by frequency, environmental temperature, and humidity changes, making it an excellent insulation material.

optical performance

Polystyrene has excellent optical properties, with a transmittance of 88% to 92% and a refractive index of 1.59 to 1.60. It can transmit visible light of all wavelengths, and its transparency is second only to acrylic polymers such as organic glass in plastics. However, due to the poor weather resistance of polystyrene, it may become cloudy and yellow when exposed to sunlight and dust during long-term use or storage. Therefore, when using polystyrene to make high transparency products such as optical components, it is necessary to consider adding appropriate types and amounts of anti-aging agents.

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