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Spectroscopic studies of poly(vinyl fluoride)

Hong, Jin-Who
http://rave.ohiolink.edu/etdc/view?acc_num=case1055351497

Abstract Details

1991, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science.
The degree of branching, head-to-head defects and stereoregularity of polyvinyl fluoride (PVF) have been measured for samples with different crystalline properties. The crystallinity of PVF decreases as the degree of branching increases. The head-to-head defect concentration in PVF has a measureable, inverse relationship to the melting temperature of the material. Differences in stereoregularity have little effect on the crystallinity, apparently due to the isomorphic character of the fluorine and hydrogen atoms. Conformational measurement of PVF have also been made. Infrared and Raman spectra of samples of poly(vinyl fluoride) have been measured. The vibrational spectra have been analyzed by means of normal-mode calculations. Force field was derived using 2-fluorobutane as a model compound. Crowder's force field for hydrofluorocarbons was employed as a starting point and subsequently refined in application to secondary fluorides. A planar zigzag, syndiotactic single chain model of crystalline PVF has been submitted to analysis by this scheme. A comparison of observed infrared and Raman bands with frequencies calculated for syndiotactic PVF shows that PVF produced by conventional free radical polymerization is atactic structure supporting F-19 NMR results and conclusion reached by Koenig and Boerio. Bands a ssignments in terms of atactic structure are proposed. Chemical and physical changes produced by flame treatment of PVF film have been studied by FTIR-ATR. By selecting appropriate reflection conditions, the ATR spectra of surface layers corresponding to different depths of penetration of the infrared beam have been recorded. ATR spectra show evidence that the concentration of fluorine and hydrogen species in the amorphous phase of the polymer and of unsaturated functional groups decreases with flame treatment. On the basis of this evidence, it is believed that elimination of a weak boundary layer is largely responsible for the improved adhesive properties found for flame-treated samples. ESCA and contact angle measurements have also been performed, and the results of both methods of surface characterization support these conclusions.
J. Koenig (Advisor)
168 p.
Spectroscopic poly(vinyl fluoride)

Recommended Citations

Citations

  • Hong, J.-W. (1991). Spectroscopic studies of poly(vinyl fluoride) [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1055351497

    APA Style (7th edition)

  • Hong, Jin-Who. Spectroscopic studies of poly(vinyl fluoride). 1991. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1055351497.

    MLA Style (8th edition)

  • Hong, Jin-Who. "Spectroscopic studies of poly(vinyl fluoride)." Doctoral dissertation, Case Western Reserve University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1055351497

    Chicago Manual of Style (17th edition)

case1055351497
868
© 1991, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.