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MOLECULAR MOBILITY OF UNFILLED AND CARBON BLACK FILLED ISOPRENE RUBBER STUDIED BY PROTON NMR TRANSVERSE RELAXATION AND DIFFUSION

Joshi, Tirtha Raj
http://rave.ohiolink.edu/etdc/view?acc_num=akron1199906776

Abstract Details

2008, Master of Science, University of Akron, Physics.
In an attempt to understand the effect of intense ultrasound on the devulcanization of unfilled and filled isoprene rubber (IR), melts and networks, non spectroscopic solid state NMR proton transverse relaxation (T2) and pulsed gradient diffusion measurements were performed. At 70.50C, the T2 relaxation decay of the unfilled and 35phr carbon black filled was successfully described by two-component four-parameter model. The long component mainly arose from the unentangled sol, dangling ends and oligomers, and the short component was due to the entangled sol and crosslinked network. Sonication increased intermolecular mobilities, while curing reversed this effect. The long and short T2 components in CB filled IR without processing oil increased with increasing sol generated, while no such increase was observed in the IR extended with oil. Thus, processing oil significantly altered the dependence of both T2 components on the sol fraction. The high melt molecular weight (M) without a low M tail precluded diffusion measurements. The IR melts were then degraded ultrasonically with and without subsequent vulcanization. It lowered and broadened the molecular weight distribution. This made it possible to conduct pulsed gradient diffusion experiments; the diffusion spectrum is bimodal. Here the T2 decays are consistent with a three- component model with six parameters. The additional component here is the intermediate T2 component. The results obtained were quantitatively related to earlier work in natural rubber.
Ernst Von Meerwall (Advisor)
73 p.
Physics, General
NMR relaxation.; Diffusion; Spin Spin relaxation; Molecular Mobility

Recommended Citations

Citations

  • Joshi, T. R. (2008). MOLECULAR MOBILITY OF UNFILLED AND CARBON BLACK FILLED ISOPRENE RUBBER STUDIED BY PROTON NMR TRANSVERSE RELAXATION AND DIFFUSION [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1199906776

    APA Style (7th edition)

  • Joshi, Tirtha. MOLECULAR MOBILITY OF UNFILLED AND CARBON BLACK FILLED ISOPRENE RUBBER STUDIED BY PROTON NMR TRANSVERSE RELAXATION AND DIFFUSION. 2008. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1199906776.

    MLA Style (8th edition)

  • Joshi, Tirtha. "MOLECULAR MOBILITY OF UNFILLED AND CARBON BLACK FILLED ISOPRENE RUBBER STUDIED BY PROTON NMR TRANSVERSE RELAXATION AND DIFFUSION." Master's thesis, University of Akron, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1199906776

    Chicago Manual of Style (17th edition)

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© 2008, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.