POLYMERS
Glass Fiber Reinforced PBT — Dynamic-Mechanical Properties
A 30% glass fiber-reinforced PBT (parallel and perpendicular to the fiber orientation) was measured in the 3-point bending mode at 1 Hz and 2 K/min.
Considerably higher values for the stiffness and the onset of the E'-decrease (43°C) are obtained for the parallel-oriented type (solid line). The tanδ values are accordingly lower. The tanδ peaks are at the same temperature.
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The polyester fiber tested in the tension mode shows relaxations in the low-temperature range, which can be evaluated at E' onset, E'' peak or tanδ peak. Glass transition starts at 75°C. The storage modulus decreased from approx. 4,200 MPa to 200 MPa. (measurement with DMA 242 E Artemis)