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Weak bonding between PLA and carbon fiber can significantly affect the mechanical properties in this method , however , surface modification of carbon fiber bundle with methylene dichloride and PLA particles improved adhesion and increased tensile and flexural strength .
 concept or principle: bonding; material: PLA; material: carbon fiber; concept or principle: mechanical properties; manufacturing process: surface modification; material: carbon fiber; material: methylene dichloride; material: PLA; concept or principle: particles; machanical property: adhesion; machanical property: tensile; machanical property: flexural strength
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: bonding; material: PLA; material: carbon fiber; concept or principle: mechanical properties; manufacturing process: surface modification; material: carbon fiber; material: methylene dichloride; material: PLA; concept or principle: particles; machanical property: adhesion; machanical property: tensile; machanical property: flexural strength