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A New Approach toward Investigation of Structure of Terminal Units of Poly(1,3‐Pentadiene) using T 2 ‐Filtered NMR Spectroscopy
Author(s) -
Rozentsvet Victor A.,
Sablielly A.,
Ulyanova Daria M.,
Kuznetsova Marianna G.,
Kostjuk Sergei V.,
Tolstoy Peter M.
Publication year - 2020
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.202000168
Subject(s) - heteronuclear molecule , chemistry , spectroscopy , carbon fibers , nuclear magnetic resonance spectroscopy , two dimensional nuclear magnetic resonance spectroscopy , proton , relaxation (psychology) , hydrogen bond , cationic polymerization , hydrogen , crystallography , materials science , polymer chemistry , stereochemistry , molecule , physics , organic chemistry , psychology , social psychology , quantum mechanics , composite number , composite material
A new method for the identification of the structure of terminal units in poly(1,3‐pentadiene) synthesized by cationic mechanism is developed. The conducting of NMR experiments with a T 2 filter allows the intensities of the spectral signals of carbon and hydrogen atoms of main chain groups of poly(1,3‐pentadiene) with a short relaxation time to be decreased and significantly increases the intensities of signals of carbon and hydrogen atoms of head and end groups, which are characterized by higher mobility. Using 1D NMR spectroscopy with a T 2 filter as well as 2D heteronuclear single‐quantum correlation and heteronuclear multiple‐bond correlation NMR spectroscopy, it is found that the position of four out of five carbon atoms of the head group fully coincides with the position of spectral signals of carbon atoms of trans ‐1,2‐ and trans ‐1,4‐ units of a main polymer chain. This new method allows the identification of the signals of all carbon atoms in head trans ‐1,4‐ group of poly(1,3‐pentadiene).