8621
This study focuses on changes in the structure of ionomer membranes , provided by the 3M Fuel Cells Component Group , as a function of the equivalent weight ( EW ) and the relationship between the structure and the properties of the membrane .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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