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Composite films with 0 - 80 wt % of such modified CNCs ( mCNCs ) within a poly ( butadiene ) ( PBD ) rubber matrix were prepared via cross - linking by UV - light initiated thiol - ene click reaction .
 Chemical: poly ( butadiene ); Chemical: PBD; Chemical: thiol - ene
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: poly ( butadiene ); Chemical: PBD; Chemical: thiol - ene