23280
Cavitation during tensile deformation of isothermally crystallized polypropylene and high - density polyethylene .
 Chemical: polypropylene; Chemical: polyethylene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: polypropylene, polyethylene 
Answer:
 Chemical: polypropylene; Chemical: polyethylene