Fig. 7. In situ optical microscopy of low Mw PP interaction with FCC-catalyst. The sample was heated under N2 flow at 10 °C min−1 to 170 °C and the temperature consecutively held. Timer started upon reaching of 100 °C. (a and c) PP6k and PP33k with illumination from the top. Outlines drawn to illustrate spread of polymer melt. (b and d) PP6k and PP33k with illumination from the below. Images were acquired in greyscale, exposure time was fixed to 200 ms. Scale bars: 100 μm.
