7471
Unfortunately , standard silicone formulations seldom present such behaviors and are then proved to have low applicability in LDM-based 3D printing.In the present study , polyethylene glycol of different lengths were added as yield stress agents in a bi-component silicone and were demonstrated to operate a drastic improvement of the material rheological behaviors , without significant impact on the final mechanical properties of the material .
 standard, silicone, LDM-based, 3D, polyethylene glycol, as, stress, bi-component silicone, material, impact, mechanical properties, material
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 standard, silicone, LDM-based, 3D, polyethylene glycol, as, stress, bi-component silicone, material, impact, mechanical properties, material