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Interestingly , the polyacrylamide hydrogel cross - linked by the inflexible alginate methacrylates exhibited less dependency between the degree of swelling and the elastic modulus than the hydrogel cross - linked by flexible PAA methacrylates .
 Chemical: polyacrylamide; Chemical: PAA; Chemical: methacrylates
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: polyacrylamide; Chemical: PAA; Chemical: methacrylates