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Two distinct thermoplastic polymers , which are common in 3D printing , were selected to study the enhancement of interlayer tensile strength of composites by additive manufacturing : a ) an amorphous polyethylene terephthalate-glycol ( PETG ) , and b ) a semi-crystalline poly ( lactic acid ) ( PLA ) .
 material: thermoplastic polymers; manufacturing process: 3D printing; machanical property: tensile strength; material: composites; manufacturing process: additive manufacturing; material: polyethylene; material: b; material: PLA
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: thermoplastic polymers, 3D printing, tensile strength, composites, additive manufacturing, polyethylene, b, PLA 
Answer:
 material: thermoplastic polymers; manufacturing process: 3D printing; machanical property: tensile strength; material: composites; manufacturing process: additive manufacturing; material: polyethylene; material: b; material: PLA