期刊
JOURNAL OF CHEMICAL PHYSICS
卷 139, 期 14, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4823834
关键词
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资金
- Japan Society for the Promotion of Science (JSPS)
- Center for Medical System Innovation (CMSI)
- Graduate Program for Leaders in Life Innovation (GPLLI)
- International Core Research Center for Nanobio
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST program)
- Ministry of Education, Culture, Sports, Science, and Technology in Japan (MEXT) through the Center for NanoBio Integration (CNBI)
- Japan Science and Technology Agency (JST) through the S-innovation program
- Ministry of Education, Culture, Sports, Science, and Technology [12J07983, 23700555, 24240069]
- Grants-in-Aid for Scientific Research [12J07983, 25708033] Funding Source: KAKEN
We have investigated the fracture behaviors of tetra-arm polyethylene glycol (Tetra-PEG) gels with controlled network structures. Tetra-PEG gels were prepared by AB-type crosslink-coupling of mutually reactive tetra-arm prepolymers with different concentrations and molecular weights. This series of controlled network structures, for the first time, enabled us to quantitatively examine the Lake-Thomas model, which is the most popular model predicting fracture energies of elastomers. The experimental data showed good agreement with the Lake-Thomas model, and indicated a new molecular interpretation for the displacement length (L), the area around a crack tip within which the network strands are fully stretched. L corresponded to the three times of end-to-end distance of network strands, regardless of all parameters examined. We conclude that the Lake-Thomas model can quantitatively predict the fracture energy of polymer network without trapped entanglements, with the enhancement factor being near 3. (C) 2013 AIP Publishing LLC.
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