Properties of polystyrene PS

- Jun 16, 2016-

• General: PS is colorless and transparent Pellet, emits smoke with a turpentine odour when burning, blow tensile wire products harder than glass, floor or will beat a similar metal sound, so called plastic can break but not bend, fracture, fracture clam shell silver color. Water absorption is 0.05% PS, slightly larger than a PE, but has little effect on product strength and dimensional stability.

• Optical properties: transparent PS is the most prominent feature of the light transmission rate of up to 88~92%, with PC and PMMA belongs to the most outstanding varieties of transparent plastic, collectively known as the three transparent plastic. The refractive index of PS for 1.59~1.60, but due to the presence of benzene rings, resulting in large birefringence and cannot be used for high quality optical instruments.

• Mechanical properties: PS hard and brittle, no elongation, tensile fracture adjacent to the yield point. Tensile strength and flexural strength of the PS in the highest among General plastics, its tensile strength 60MPa; but impact strength is small, it is difficult to for engineering plastics. PS poor wear resistance, and creep resistance. Mechanical properties of PS more greatly influenced by temperature.

• Thermal: heat resistance bad PS, heat distortion temperature of only 70~90℃, only 60~80℃ long range. Low temperature resistance of the PS is not good, embrittlement temperature is-30 degrees centigrade. PS, low thermal conductivity, typically 0.04~0.13W/(m.K), linear expansion coefficient, generally (6~8) x10-5K-1, and metals varies, so products are not conducive with metal inserts.

•electrical properties: PS excellent electrical insulation, and not under the influence of temperature and humidity; small dielectric loss angle tangent value, may be resistant to appropriate Corona; good arc resistance, suitable for high frequency insulating material.

• Environment performance: PS of chemical stability better, can resistance General acid, and alkali, and salt, and mineral oil and low-level alcohol,, can by many hydrocarbon class, and ketone class, and senior fatty acids, erosion, can dissolved Yu aromatic (as benzene, and toluene, and b benzene, and styrene,), and chloride hydrocarbon (as carbon tetrachloride, and chloroform, and two chlorine methane, and chlorobenzene,) and the ester class,. PS's bad weather, its light, poor oxidative resistance, not suitable for long-term outdoor use but PS radiation resistance, good.