14836
Polarization - Modulation Infrared Reflection Absorption Spectroscopy ( PM - IRRAS ) was employed to observe the changes in the molecular conformation of poly ( 2 - phenyl - 1 , 4 - xylylene ) ( PPPX ) films that occurred after exposure to organic solvent vapors .
 Chemical: poly ( 2 - phenyl - 1 , 4 - xylylene ); Chemical: PPPX
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 ( 2 - phenyl - 1 , 4 - xylylene ), PPPX 
Answer:
 Chemical: poly ( 2 - phenyl - 1 , 4 - xylylene ); Chemical: PPPX