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The mechanical strength of the nacre - mimicking fibers increases with increasing the content of PVA , and it rises gradually from 81 MPa for the fiber with 53 . 1 wt % PVA to 161 MPa for the fiber with 65 . 8 wt % PVA .
 Chemical: PVA; Chemical: PVA; Chemical: PVA
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: PVA; Chemical: PVA; Chemical: PVA