Probing Structure Property Relationships in Complex Engineering Silicones by 1H NMR

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It is generally accepted that the properties of polymeric materials are controlled by the network structure and the reactions by which they have been constructed. These properties include the bulk moduli at creation, but also the properties as a function of age during use. In order to interpret mechanical properties and predict the time dependent changes in these properties, detailed knowledge of the effect of structural changes must be obtained. The degree and type of crosslinking, the molecular weight between crosslinks, the number of elastically ineffective chains (loops, dangling chain ends, sol-fraction) must be characterized. A number of theoretical and ... continued below

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Chinn, S C; Gjersing, E L; Maxwell, R S; Eastwood, E; Bowen, D & Stephens, T July 14, 2006.

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It is generally accepted that the properties of polymeric materials are controlled by the network structure and the reactions by which they have been constructed. These properties include the bulk moduli at creation, but also the properties as a function of age during use. In order to interpret mechanical properties and predict the time dependent changes in these properties, detailed knowledge of the effect of structural changes must be obtained. The degree and type of crosslinking, the molecular weight between crosslinks, the number of elastically ineffective chains (loops, dangling chain ends, sol-fraction) must be characterized. A number of theoretical and experimental efforts have been reported in the last few years on model networks prepared by endlinking reactions and the relationships of those structures with the ultimate mechanical properties. A range of experimental methods have been used to investigate structure including rheometric, scattering, infrared, {sup 29}Si MAS and CPMAS, {sup 1}H relaxation measurements, and recently {sup 1}H multiple quantum methods. Characterization of the growth of multiple quantum coherences have recently been shown to provide detailed insight into silicone network structure by the ability to selective probe the individual components of the polymer network, such as the polymer-filler interface or network chains. We have employed recently developed MQ methods to investigate the structure-property relationships in a series of complex, endlinked filled-PDMS blends. Here, a systematic study of the relationship between the molecular formulation, as dictated by the amount and type of crosslinks present and by the remaining network chains, and the segmental dynamics as observed by MQ NMR was performed.

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PDF-file: 3 pages; size: 0.1 Mbytes

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  • Presented at: American Chemical Socity National Meeting, San Francisco, CA, United States, Sep 10 - Sep 14, 2006

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  • Report No.: UCRL-PROC-224930
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 894783
  • Archival Resource Key: ark:/67531/metadc888848

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  • July 14, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 8, 2016, 8:57 p.m.

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Chinn, S C; Gjersing, E L; Maxwell, R S; Eastwood, E; Bowen, D & Stephens, T. Probing Structure Property Relationships in Complex Engineering Silicones by 1H NMR, article, July 14, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc888848/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.