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This study evaluates a method for rendering syndiotactic polystyrene ( sPS ) aerogels hydrophilic using polyethylene oxide ( PEO ) of different molecular weights .
 syndiotactic polystyrene, sPS, polyethylene oxide, PEO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 syndiotactic polystyrene, sPS, polyethylene oxide, PEO