10376
In this work , the improved self - healing of cross - linked polyethylene ( PE ) ( cPE ) / carbon black ( CB ) nanocomposites by their shape memory effect ( SME ) is investigated .
 Chemical: polyethylene; Chemical: carbon black
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: polyethylene; Chemical: carbon black