期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.118001
关键词
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资金
- NSF CMMI [0823327, 0928320]
- NSF IDR CMM [I 1130948]
- Ryan Fellowship at NWU
- Swiss National Foundation [SNF SCOPES IZ73Z0-128169]
- World Class University Program through the Natl. Res. Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [R33-10079]
- Office of Science of the U.S. Department of Energy [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0928320, 0823327] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1130948] Funding Source: National Science Foundation
We explore the dynamics of entangled polymer chains embedded into nanocomposites. From primitive path analysis, highly entangled polymer chains are found to be significantly disentangled during increment of the volume fraction of spherical nonattractive nanoparticles (NPs) from 0 to 42%. A critical volume fraction, phi(c) = 31%, is found to control the crossover from polymer chain entanglements to NP entanglements. While below phi(c), the polymer chain relaxation accelerates upon filling, above phi(c), the situation reverses: polymer dynamics becomes geometrically constrained upon adding NPs. Our findings provide a microscopic understanding of the dynamics of entangled polymer chains inside their composites, and offer an explanation for the unusual rheological properties of polymer composites.
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