2133
DFT calculations , with VWN exchange correlation functional and double numeric basis set , were used to evaluate the energies required for the scission reactions taking place in the initial stage of the thermal degradation of Poly ( methyl methacrylate ) ( PMMA ) in the presence of a carbon nanotube ( CNT ) .
 Chemical: Poly ( methyl methacrylate ); Chemical: PMMA; Chemical: carbon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Poly ( methyl methacrylate ), PMMA, carbon 
Answer:
 Chemical: Poly ( methyl methacrylate ); Chemical: PMMA; Chemical: carbon