10381
The scratch self - healing tests show that the cross - linking of PE matrix , the addition of CB nanoparticles , and the previous stretching in the direction perpendicular to the scratch favor the closure of the scratch and its complete healing .
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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:
 None