TGA thermograms of polymer/graphite composites used in this work. (a) PMMA/graphite composite films (PMMAGr) and (b) PB/graphite composite films (PBGr). The numbers enclosed in parentheses represent the graphite amounts in the composite films. PMMA, PB, and Gr indicate poly(methyl methacrylate), polybutadiene, and graphite, respectively. The measurement was conducted in an airflow of 40 cc/min. The heating rate was 5°C/min.