Probing degradation in complex engineering silicones by 1H multiple quantum NMR

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Static {sup 1}H Multiple Quantum Nuclear Magnetic Resonance (MQ NMR) has recently been shown to provide detailed insight into the network structure of pristine silicon based polymer systems. The MQ NMR method characterizes the residual dipolar couplings of the silicon chains that depend on the average molecular weight between physical or chemical constraints. Recently, we have employed MQ NMR methods to characterize the changes in network structure in a series of complex silicone materials subject to numerous degradation mechanisms, including thermal, radiative, and desiccative. For thermal degradation, MQ NMR shows that a combination of crosslinking due to post-curing reactions as ... continued below

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Maxwell, R S; Chinn, S C; Giuliani, J & Herberg, J L September 5, 2007.

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Static {sup 1}H Multiple Quantum Nuclear Magnetic Resonance (MQ NMR) has recently been shown to provide detailed insight into the network structure of pristine silicon based polymer systems. The MQ NMR method characterizes the residual dipolar couplings of the silicon chains that depend on the average molecular weight between physical or chemical constraints. Recently, we have employed MQ NMR methods to characterize the changes in network structure in a series of complex silicone materials subject to numerous degradation mechanisms, including thermal, radiative, and desiccative. For thermal degradation, MQ NMR shows that a combination of crosslinking due to post-curing reactions as well as random chain scissioning reactions occurs. For radiative degradation, the primary mechanisms are via crosslinking both in the network and at the interface between the polymer and the inorganic filler. For samples stored in highly desiccating environments, MQ NMR shows that the average segmental dynamics are slowed due to increased interactions between the filler and the network polymer chains.

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PDF-file: 12 pages; size: 0.1 Mbytes

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  • Presented at: American Chemical Society Meeting, Chicago, IL, United States, Apr 20 - Apr 24, 2007

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  • Report No.: UCRL-PROC-234463
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 925666
  • Archival Resource Key: ark:/67531/metadc898203

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  • September 5, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 8:57 p.m.

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Maxwell, R S; Chinn, S C; Giuliani, J & Herberg, J L. Probing degradation in complex engineering silicones by 1H multiple quantum NMR, article, September 5, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898203/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.