Công Trình Nghiên Cứu Archives
Figure 4. The pitch sample surface changes at 325 oC with heating rate of 10 oC/h: (a)- before heating, holding time (b)-0 min, (c)- 45 min, (d)- 90 min, (e)- 135 min. It''s observed the mesophase began to appear on the pitch surface at a temperature of 325 °C with a holding time of 0 minutes (figure 4b).
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