2.4. Dynamic mechanical analysis (DMA)
Measurements of dynamic mechanical properties were carried
out on a dynamic mechanical analyzer (DMA) (DMA/SDTA861e,
Mettler Toledo) in three-point bending mode, and the sample size
was 556.32.8 mm. All DMA experiments were performed at
1 Hz with a scanning temperature range of50 to 120C at a heating rate of 2C/min under flowing nitrogen atmosphere.