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We investigate the effects of variation in chemical conditions ( solvent composition , water content , polymer concentration , and added salt ) on the morphologies formed by PS - b - PAA in DMF / dioxane / water mixtures in a two - phase gas - liquid segmented microfluidic reactor .
 Chemical: PS - b - PAA; Chemical: DMF; Chemical: dioxane
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: PS - b - PAA; Chemical: DMF; Chemical: dioxane