9107
In this work , a facile photoinduced one - step method was first developed for the covalent immobilization of ATRP initiators on the C - H group - containing substrates such as biaxially oriented polypropylene ( BOPP ) .
 Chemical: C - H; Chemical: polypropylene
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: C - H, polypropylene 
Answer:
 Chemical: C - H; Chemical: polypropylene