14889
Self - assembled structures of brush block copolymers ( BrBCPs ) with polylactide ( PLA ) and polystyrene ( PS ) side chains were studied .
 Chemical: polylactide; Chemical: PLA; Chemical: polystyrene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polylactide; Chemical: PLA; Chemical: polystyrene