TITLE

Pulsed NMR Spectroscopy of Structural Changes in Chemically Modified Polypropylene

AUTHOR(S)
Gafarov, A.M.; Galibeev, S.S.; Kochnev, A.M.; Sukhanov, P.P.; Arkhireev, V.P.
PUB. DATE
July 2004
SOURCE
Journal of Applied Spectroscopy;Jul/Aug2004, Vol. 71 Issue 4, p493
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The structure of the polypropylene compositions obtained as a result of modification by multicomponent systems has been studied by the method of pulsed NMR spectroscopy. The times of relaxation were analyzed in a wide temperature range. The character of the occurring changes at the level of supermolecular structure is described. It is shown that the amplifications manifesting themselves upon modification of polypropylene by mixtures based on 2,4‐toluene diisocyanate (TDI) and ℇ‐caprolactam (ℇ‐CL) are associated with the change in the character of intermolecular interaction and with the formation of a more ordered structure of the polymer.
ACCESSION #
15193313

 

Related Articles

  • Two-dimensional exchange nuclear magnetic resonance of powder samples. IV. Distribution of correlation times and line shapes in the intermediate dynamic range. Schaefer, D.; Spiess, H. W. // Journal of Chemical Physics;12/1/1992, Vol. 97 Issue 11, p7944 

    The two-dimensional (2D) exchange nuclear magnetic resonance (NMR) experiment is applied to study ultraslow as well as faster chain motions in amorphous polymers in the glass transition range. Acquisition of the time domain data with a four-pulse sequence leads to new characteristics in the...

  • Theory of NMR spectra of oriented macromolecules. Kulagina, T.; Karnaukh, G.; Smirnov, L. // Doklady Physical Chemistry;Feb2008, Vol. 418 Issue 2, p36 

    The article presents a study on the theory of nuclear magnetic resonance (NMR) spectra of oriented polymers. In the study, the researchers developed a theory of NMR spectra based on the theory of free induction decay in isotropic polymer networks and quasi-networks of entanglements. They found...

  • SYNTHESIS AND INVESTIGATION OF amino-, azo- AND p-PHENYLENE GROUP CONTAINING POLYMERS. DURGARYAN, A. A.; ARAKELYAN, R. A.; DURGARYAN, N. A. // Izvestiya Vysshikh Uchebnykh Zavedenii. Seriya Khimiya i Khimich;2011, Vol. 54 Issue 10, p64 

    For the first time, polymers with different content of N-acetyl groups in the main chain were synthesized through classic methods, and were characterized by ¹H-nuclear magnetic resonance, UV-vis, ESR, Fourier transform infrared spectroscopy and electrical conductivity measurements....

  • Sulphonated Poly(ethylene terephthalate)/Poly(3-hydroxy butyrate) Blends: Miscibility, Thermal Behavior, and Specific Interactions. Silva, Rafael; Carvalho, Gizilene M.; Muniz, Edvani C.; Vidotti, Gentil J.; Rubira, Adley F. // e-Polymers;Nov2007, p1 

    PETs/PHB blends with different compositions were produced by "casting" method. The blends were investigated by TGA, DSC, ¹H and 13C NMR and FTIR. Phase separation occurred during blend preparation. PETs and PHB were present in both formed phases. The phases presented different thermal...

  • Estimation of the Degree of Crystallinity of Partially Crystalline Polypropylenes Using 13C NMR. HRONSKÝ, V.; KOVAL'AKOVÁ, M.; VRÁBEL, P.; UHRÍNOVÁ, M.; OLČÁK, D. // Acta Physica Polonica, A.;Jun2014, Vol. 125 Issue 6, p409 

    The paper deals with a method for the estimation of the degree of crystallinity for partially-crystalline isotactic-polypropylenes (i-PP) using high-resolution solid-state 13C NMR. For this purpose direct polarization 13C MAS NMR spectra were measured for i-PP samples with different degrees of...

  • Three-dimensional variable-angle nuclear magnetic resonance exchange spectroscopy without rotor axis hopping. Lee, Y. K.; Emsley, L.; Larsen, R. G.; Schmidt-Rohr, K.; Hong, M.; Frydman, L.; Chingas, G. C.; Pines, A. // Journal of Chemical Physics;8/1/1994, Vol. 101 Issue 3, p1852 

    Slow, large-amplitude chain motions play an important role in determining the macroscopic mechanical properties of polymers. Although such motions have been studied quantitatively by two-dimensional (2D) nuclear magnetic resonance (NMR) exchange experiments, overlapping anisotropic patterns...

  • Characterization of the morphology of iPP/sPP blends with various compositions. Bourbigot, S.; Garnier, L.; Revel, B.; Duquesne, S. // Express Polymer Letters;2013, Vol. 7 Issue 3, p224 

    The paper investigates the morphology and the structural properties of blends of isotactic polypropylene (iPP) and syndiotactic polypropylene (sPP) having different compositions using different techniques. Solid-state nuclear magnetic resonance (NMR) permits via appropriate sequence to measure...

  • Local and global dynamics of atactic polypropylene melts by multiple field [sup 13]C nuclear magnetic resonance. Qiu, XiaoHua; XiaoHua Qiu; Moe, N. E.; Moe, N.E.; Ediger, M. D.; Ediger, M.D.; Fetters, Lewis J. // Journal of Chemical Physics;8/15/2000, Vol. 113 Issue 7 

    [sup 13]C NMR T[sub 1], NOE, and T[sub 1ρ] were measured for an atactic polypropylene (aPP) melt at 5, 25, 75, and 125 MHz [sup 13]C Larmor frequencies from 43 °C to 260 °C. The data were fit very well with a model for C-H vector reorientation composed of very fast librational...

  • One- and two-dimensional exchange J-resolved CP-MAS NMR spectrum of adamantane. Takegoshi, K.; McDowell, C. A. // Journal of Chemical Physics;2/15/1986, Vol. 84 Issue 4, p2084 

    A combined technique of 1D and 2D exchange NMR and J-resolved CP-MAS NMR of dilute spins in solids and its application to study a spin exchange process of abundant spins in solids is described, and demonstrated for powdered adamantane. A high-resolution J-resolved NMR spectrum of a 13C nucleus...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics