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  Segmental relaxation in crosslinked rubber

Roland, C. M., Bero, C. A., Ngai, K. L., & Antonietti, M. (1996). Segmental relaxation in crosslinked rubber. Materials Research Society Symposium Proceedings, 411, 367. doi:10.1557/PROC-411-367.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-73EB-F Version Permalink: http://hdl.handle.net/21.11116/0000-0002-4E44-B
Genre: Journal Article

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Roland, C. M., Author
Bero, C. A., Author
Ngai, K. L., Author
Antonietti, M.1, Author              
Affiliations:
1Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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 Abstract: Studies of the local segmental relaxation in rubbery networks reveal a variety of behaviors. In experiments on networks with labeled junctions, whereby the motion of the crosslink site is specifically monitored, the segmental relaxation function broadens, accompanied by a larger activation energy, in a manner well-described by the coupling model of relaxation. The more usual experiment simply measures bulk relaxation, without discriminating among different relaxing entities. For networks, crosslinking introduces a distribution of relaxation behaviors, related to the proximity of a moiety to the junctions. The resulting inhomogeneously broadened relaxation function is difficult to analyze; nevertheless, a heightened sensitivity to temperature (larger activation energy) is exhibited, from which inferences can be made regarding the shape of the relaxation function. Finally, the segmental relaxation of highly crosslinked microgels is ostensibly homogeneous. Interestingly, however, the inverse correlation between the stretch exponent, β, and the activation energy, observed quantitatively in conventional networks, is violated by the microgels.

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 Dates: 20111996
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 367521
DOI: 10.1557/PROC-411-367
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Title: Materials Research Society Symposium Proceedings
  Other : MRS Symposium Proceedings
Source Genre: Journal
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Publ. Info: New York : Materials Research Society
Pages: - Volume / Issue: 411 Sequence Number: - Start / End Page: 367 Identifier: ISSN: 0272-9172