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A DFT study on the initial stage of thermal degradation of Poly ( methyl methacrylate ) / carbon nanotube system .
 Poly ( methyl methacrylate ), carbon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Poly ( methyl methacrylate ), carbon