Mechanical Properties of PBT
I. The Influence of Glass Fiber on the Mechanical Properties of PBT: The heat distortion temperature is greatly increased. The various strength properties are multiplied compared to those under the same conditions, and the strengths of MPPO, POM, and PC are all good.
II. The Influence of Temperature on the Mechanical Properties of PBT: When the temperature rises, the tensile strength, flexural strength, and notched impact strength of PBT all decrease, but its notched impact strength increases under certain conditions.
III. The notched impact strength of PBT resin is relatively low, and it is highly sensitive to notches.
IV. PBT material features outstanding dynamic mechanical properties and excellent creep resistance.
Thermal Performance of PBT
The heat distortion temperature of PBT material increases significantly with increasing glass fiber content. Pure PBT material has a heat distortion temperature of 60°C, while 30% glass fiber reinforced PBT material reaches 210°C.
The molecular structure of PBT material is symmetrical and exhibits a high degree of geometric regularity, thus it possesses high crystallization ability.
The Tg (glass transition temperature) point of PBT is very low, only 22–43°C. It begins to crystallize at 40°C, so it can fully crystallize at a mold temperature around 60°C to obtain products with the required performance.
Electrical and Chemical Properties of PBT
PBT molecules do not contain strong polar groups like polyamides. Their molecular structure is symmetrical and geometrically regular, endowing them with excellent electrical properties. Another manifestation of the excellent electrical performance of PBT is that it changes very little with factors such as temperature, time, and frequency.
