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The strength of this interface is governed by the reptation theory which postulates a more efficient interpenetration of polymeric surfaces with decreasing polymer viscosity .
 machanical property: strength; concept or principle: interface; concept or principle: surfaces; material: polymer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: strength, interface, surfaces, polymer 
Answer:
 machanical property: strength; concept or principle: interface; concept or principle: surfaces; material: polymer